Electricity: power supply or regulation systems inventions 10/08

20080258695 - Switching device integrated with light emitting device: A light emitting component can include a substrate, a light emitting device supported by the substrate, wherein the light-emitting device has first and second terminals, and a switching element supported by the substrate and having first and second terminals electrically connected to the first and second terminals of the light-emitting... Agent: Luminus Devices , Inc. C/o Wolf, Greenfield & Sacks , P.C.

20080258696 - Series regulator circuit: A series regulator circuit for reducing current consumption, enabling switching between different current consumption modes, and suppressing output voltage fluctuations. A constant current source 20, connected to an input voltage line, is connected to a ground voltage line via a resistor element 21 and transistor B1. Gate terminals of transistors... Agent: Freescale Semiconductor, Inc. Law Department

20080258697 - Dynamic gate drive voltage adjustment: A DC-DC buck converter comprises a high-side power FET having a current path connected in series between an input terminal and an inductor connected to an output terminal supplying an output current to a load. The converter further comprises a low-side power FET having a current path connected between a... Agent: Texas Instruments Incorporated

20080258698 - Soft start circuit, power suppy unit and electric equipment: A soft start circuit includes a constant current source for generating a constant current, a first current mirror circuit for generating from the constant current a first mirror current, a second current mirror circuit for generating from the constant current a second mirror current smaller than the first mirror current,... Agent: Rohm Co., Ltd. C/o Keating & Bennett, LLP

20080258699 - Converter circuit with improved efficiency: The present invention relates to a converter circuit and a conversion method for converting an input signal to an output signal of a predetermined value based on a switched operating mode, wherein a first control loop (40) is provided for comparing the predetermined value of the output signal to a... Agent: Nxp, B.v. Nxp Intellectual Property Department

20080258700 - Method and apparatus for adjusting on-chip delay with power supply control: An apparatus and method are provided for powering an integrated circuit chip with a supply voltage generated externally to the chip. An on-chip clock signal is generated with a ring oscillator fabricated on the integrated circuit chip. The supply voltage is altered as a function of a difference between a... Agent: Henry Groth Lsi Logic Corporation

20080258701 - Dc-dc converter with improved dynamic response: The invention relates to a control method and a controller for a DC-DC converter, such as a synchronous Buck converter, which exploits the principle of capacitor charge balance to allow the converter to recover from a positive and/or negative load current step in the shortest achievable time, with the lowest... Agent: Parteq Research & Development Innovations

20080258702 - Output circuit: An output circuit in accordance with one embodiment of the present invention includes: an input terminal for receiving an input signal; an output transistor connected between a first power supply and an output terminal; a current control circuit connected to the input terminal and the output transistor for controlling current... Agent: Sughrue Mion, PLLC

20080258703 - Power supply with reduced power losses during standby mode: There is provided a power supply for an electrical device operable in active mode and in standby mode. The power supply comprises a transformer having a primary winding on the primary side and a secondary winding on the secondary side. The primary winding is connectable to an AC voltage supply... Agent: Creative Labs, Inc. Legal Department

20080258695 - Switching device integrated with light emitting device: A light emitting component can include a substrate, a light emitting device supported by the substrate, wherein the light-emitting device has first and second terminals, and a switching element supported by the substrate and having first and second terminals electrically connected to the first and second terminals of the light-emitting... Agent: Luminus Devices , Inc. C/o Wolf, Greenfield & Sacks , P.C.

20080258696 - Series regulator circuit: A series regulator circuit for reducing current consumption, enabling switching between different current consumption modes, and suppressing output voltage fluctuations. A constant current source 20, connected to an input voltage line, is connected to a ground voltage line via a resistor element 21 and transistor B1. Gate terminals of transistors... Agent: Freescale Semiconductor, Inc. Law Department

20080258697 - Dynamic gate drive voltage adjustment: A DC-DC buck converter comprises a high-side power FET having a current path connected in series between an input terminal and an inductor connected to an output terminal supplying an output current to a load. The converter further comprises a low-side power FET having a current path connected between a... Agent: Texas Instruments Incorporated

20080258698 - Soft start circuit, power suppy unit and electric equipment: A soft start circuit includes a constant current source for generating a constant current, a first current mirror circuit for generating from the constant current a first mirror current, a second current mirror circuit for generating from the constant current a second mirror current smaller than the first mirror current,... Agent: Rohm Co., Ltd. C/o Keating & Bennett, LLP

20080258699 - Converter circuit with improved efficiency: The present invention relates to a converter circuit and a conversion method for converting an input signal to an output signal of a predetermined value based on a switched operating mode, wherein a first control loop (40) is provided for comparing the predetermined value of the output signal to a... Agent: Nxp, B.v. Nxp Intellectual Property Department

20080258700 - Method and apparatus for adjusting on-chip delay with power supply control: An apparatus and method are provided for powering an integrated circuit chip with a supply voltage generated externally to the chip. An on-chip clock signal is generated with a ring oscillator fabricated on the integrated circuit chip. The supply voltage is altered as a function of a difference between a... Agent: Henry Groth Lsi Logic Corporation

20080258701 - Dc-dc converter with improved dynamic response: The invention relates to a control method and a controller for a DC-DC converter, such as a synchronous Buck converter, which exploits the principle of capacitor charge balance to allow the converter to recover from a positive and/or negative load current step in the shortest achievable time, with the lowest... Agent: Parteq Research & Development Innovations

20080258702 - Output circuit: An output circuit in accordance with one embodiment of the present invention includes: an input terminal for receiving an input signal; an output transistor connected between a first power supply and an output terminal; a current control circuit connected to the input terminal and the output transistor for controlling current... Agent: Sughrue Mion, PLLC

20080258703 - Power supply with reduced power losses during standby mode: There is provided a power supply for an electrical device operable in active mode and in standby mode. The power supply comprises a transformer having a primary winding on the primary side and a secondary winding on the secondary side. The primary winding is connectable to an AC voltage supply... Agent: Creative Labs, Inc. Legal Department

20080252268 - Method for actuation, and actuating circuit for a switch in a power factor correction circuit: The document describes a method and an actuating circuit for actuating a switch regulating the power consumption in a power factor correction circuit which has input terminals for applying an input voltage and output terminals for providing an output voltage. In this case, the switch is cyclically turned on for... Agent: Maginot, Moore & Beck Chase Tower

20080252269 - Actuating circuit: Disclosed is an actuating circuit and method for actuating a switch regulating the power consumption in a power factor correction circuit having input terminals for applying an input voltage and output terminals for providing an output voltage. The switch is cyclically turned on for an on-time and turned off for... Agent: Maginot, Moore & Beck

20080252270 - Phase control method and phase control device: A selectable operation amount is set as a threshold value according to an input operation amount, where if a determination value obtained by adding the input operation amount and an integrated operation amount or an output error accumulated value is greater than or equal to the threshold value, the threshold... Agent: Foley And Lardner LLP Suite 500

20080252271 - Power conversion device: In a power conversion device having high side and low side switches connected to a coil, a direction of a coil current is determined during a dead time period where the respective switches turn off at the same time to make the increase/decrease ratio of the coil current correspond to... Agent: Posz Law Group, PLC

20080252272 - Voltage regulator with cotrol of switching elements: A regulator comprises an output terminal producing a regulated output voltage, a first comparator, a second comparator, a first sourcing circuit coupled to the output terminal, and a first sinking circuit coupled to the output terminal. The first comparator compares a feedback signal representative of the output voltage and a... Agent: O2micro Inc C/o Murabito, Hao & Barnes LLP

20080252273 - Dc/dc converter: The present invention is related to a dc/dc converter. A dc/dc converter according to the present invention comprises an inductor, a switch unit connected to both ends of the inductor and charging or retrieving an energy into the inductor, an output unit comprising an output switch unit outputting the energy... Agent: Pryor Cashman, LLP

20080252275 - Determining average output current in dc-dc converter: A switching circuit for converting an input voltage into an output voltage has an input terminal for receiving the input voltage. A power switching element is coupled to the input terminal and has duty cycle d controllable to adjust the output voltage with respect to a desired level using inductor... Agent: Mcdermott Will & Emery LLP

20080252276 - Method of forming a buck-boost mode power supply controller and structure therefor: In one embodiment, a power supply controller is configured to operate a plurality of switches in a buck-boost mode to control an output voltage wherein at least one switch of the plurality of switches is enabled for a substantially fixed portion of a cycle of the buck-boost mode.... Agent: Semiconductor Components Industries, LLC Intellectual Property Dept. - A700

20080252274 - Pseudo fixed frequency switch-mode dc/dc voltage regulator control method: A method for controlling a step down regulator includes (a) generating a first feedback signal as a function of the voltage at the output node; (b) generating a second feedback signal as a function of the voltage at the input node; (c) maintaining the on-time of the low-side switch at... Agent: Advanced Analogic Technologies

20080252280 - Continuous-time digital controller for high-frequency dc-dc converters: The present invention is a voltage mode digital controller for low-power high-frequency dc-dc converters that has recovery time approaching physical limitations of a given power stage. It consists of a digital controller with load transient response approaching physical limitations of a given power stage that is suitable for low-power SMPS.... Agent: Miller Thompson, LLP

20080252279 - Control circuit for dc converter: A method of controlling at least one transistor of a DC voltage converter to regulate an output voltage of the DC converter, the method including determining whether the output voltage of the DC converter is within a first or second voltage range, the second voltage range including a desired value... Agent: Stmicroelectronics Inc. C/o Wolf, Greenfield & Sacks, P.C.

20080252277 - Digital control switching power-supply device and information processing equipment: To provide a digital control switching power-supply device capable of suitably achieving fast transient response at the time of a sudden load change. In parallel with normal digital signal processing means that outputs a PWM pulse signal having a desired duty, transient variation detection means composed of a CR filter... Agent: Antonelli, Terry, Stout & Kraus, LLP

20080252278 - System and method for controlling a hysteretic mode converter: A system and method for controlling a conversion frequency of a hysteretic mode voltage converter. A digital control loop comprises a timing measure unit having a first input coupled to a reference clock and a second input coupled to a clock based on a switching of the switching of the... Agent: Texas Instruments Incorporated

20080252281 - Switching power supply circuit having soft start circuit: An exemplary switching power supply circuit includes at least a power input terminal, a power control chip, and a soft start circuit. The power input terminal is configured for receiving an operating voltage applied to the switching power supply circuit, and the power control chip is configured for modulating a... Agent: Wei Te Chung Foxconn International, Inc.

20080252282 - Reference current circuit: Provided is a reference current circuit able to reduce temperature dependence of the reference current even in a case of using a resistor with extremely low temperature-dependent resistance. The reference current circuit comprises a non-inverting amplifier circuit 110 receiving a temperature-compensated reference voltage VBG and generating a voltage Vout1 at... Agent: Mcdermott Will & Emery LLP

20080246445 - Power factor correction by measurement and removal of overtones: A power factor correction circuit (42/44) responsive to an input power supply signal at an input supply voltage (VAC) that varies largely sinusoidally with time at a fundamental supply frequency contains regulator/control circuitry (60, 62, and 64) for measuring and removing overtones (ILDm or IFWRm) in the input supply current... Agent: Ronald J. Meetin, Attorney At Law

20080246444 - System and method for power controller: System and method for power controller. According to an embodiment, the present invention provides a power factor correction apparatus. The apparatus includes a multiplier component that is configured to process a first input signal and a second input signal. For example, the first input signal is associated with a rectified... Agent: Jones Day

20080246449 - Feed controller: A feed controller adopted to be included in a battery drive type device, the feed controller adopted to supply power to a predetermined load from a battery holder that obtains rated electromotive force from plural rated number of batteries having predetermined specification and connected in series while held by the... Agent: Harness, Dickey & Pierce, P.L.C

20080246447 - Method and apparatus for integrated cable drop compensation of a power converter: An integrated circuit controller for a power converter to be coupled to a distribution network is disclosed. An example integrated circuit controller according to aspects of the present invention includes a switching control circuit that outputs a drive signal to control switching of a switch to regulate an output of... Agent: Blakely Sokoloff Taylor & Zafman LLP

20080246446 - Method and apparatus for on/off control of a power converter: A power converter control method and apparatus is disclosed. An example power converter controller according to aspects of the present invention includes feedback sampling circuitry to be coupled to an output of a power converter. The feedback sampling circuitry is to generate feedback signal samples after a conduction of a... Agent: Blakely Sokoloff Taylor & Zafman LLP

20080246448 - Sleep mode control circuit and method for a dc/dc switching power supply system: A sleep mode control circuit and method are provided to pull high the error signal of a DC/DC switching power supply system to a target level when the switching power supply system is in a sleep mode, such that the switching power supply system can be more rapidly waked up... Agent: Rosenberg, Klein & Lee

20080246450 - Soft-start circuit and method therefor: In one embodiment, a soft-start circuit is configured to form drive pulses that increase in width independently of the current through the power switch during a first portion of the soft-start operation period.... Agent: Semiconductor Components Industries, LLC Intellectual Property Dept. - A700

20080246451 - Power supply for a load control: A power supply adapted to be coupled in series electrical connection between an AC voltage source and an electrical load for generating a DC voltage, the power supply comprising an energy storage capacitor, the DC voltage produced across the capacitor; a charging circuit adapted to be coupled in series electrical... Agent: Ostrolenk Faber Gerb & Soffen

20080246454 - Dc/dc converter: A DC/DC converter is supplied such that the desired output setting voltage can be obtained as the load-side output, even when the difference between the power supply voltage and the output setting voltage of the load-side output is large. This DC/DC converter comprises a switching device, a voltage divider, an... Agent: Arent Fox LLP

20080246452 - Device and method for charging an electrical energy storage device: A device is described for charging an electrical energy storage device, which has an active current-limiting device in a main current path in order to limit a supply current to a predefined maximum current. A voltage transformer device is situated downstream from the current-limiting device for raising the potential of... Agent: Kenyon & Kenyon LLP

20080246453 - Power supply system using delay lines in regulator topology to reduce input ripple voltage: A power supply system for reducing input ripple voltage, the system including: a first regulator having at least two inputs, one input being a voltage input pin and another input being a synchronization pin; a second regulator having at least two inputs, one input being a voltage input pin and... Agent: Cantor Colburn LLP - IBM Tuscon Division

20080246455 - Adaptive zero current sense apparatus and method for a switching regulator: A switching regulator includes a low-side switch having a body diode. During the low-side switch is on, a zero-current sense circuit monitors the inductor current of the switching regulator and triggers a signal to turn off the low-side switch when the inductor current falls down to a zero-current threshold, to... Agent: Rosenberg, Klein & Lee

20080246456 - Method and apparatus for controlling the maximum output power of a power converter: A controller for a power converter is disclosed. An example circuit controller according to aspects of the present invention includes an input voltage sensor to be coupled to receive an input signal representative of an input voltage of the power converter. A current sensor is also included and is to... Agent: Blakely Sokoloff Taylor & Zafman LLP

20080246457 - Voltage up-conversion circuit: According to one exemplary embodiment, a voltage up-conversion circuit includes a modulated voltage generator circuit, where the modulated voltage generator circuit is configured to receive an input voltage and generate a modulated voltage, and where the modulated voltage generator circuit includes at least one transistor. The voltage up-conversion circuit further... Agent: Michael Farjami, Esq. Farjami & Farjami LLP

20080246458 - Digital compensation tuning for switching power supply control: A tuner having one or more digitally controllable tuning components may be coupled to an analog feedback compensation network in a target switching power supply controller to adjust the compensation while the power supply is operating. A communication interface couples the tuner to a host having a software interface to... Agent: Semiconductor Components Industries, LLC Intellectual Property Dept. - A700

20080246459 - Common-mode surge suppression: There is disclosed a filter for reducing electromagnetic interference generated by a power converter. The filter may include a common-mode inductor having first and second windings on a common core. The first and second windings may be connected between first and second power input lines and first and second inputs... Agent: SocalIPLaw Group LLP

20080238374 - Sampling method with adjusting duty ratios: A sampling method with adjusting duty ratios is provided and includes the following steps. A first working pulse signal which has a pulse-width duty ratio D in a switching period Ts is provided. A first adjusting period comprising first N successive switching periods of the first working pulse signal is... Agent: Volpe And Koenig, P.C.

20080238375 - Systems and methods for reducing emi in switch mode converter systems: Switch mode power converter system and method thereof. The system includes one or more isolation boxes including at least a first isolation box, an input primary winding for receiving an input signal for the switch mode power converter system, and an output secondary winding for generating an output signal for... Agent: Jones Day

20080238376 - Voltage regulator with high voltage protection: A method for regulating a voltage in an integrated circuit device includes providing a first regulated output based upon a first voltage input range and subsequently receiving the first regulated output and providing a second regulated output based upon a second voltage input range of the first regulated output. A... Agent: Garlick Harrison & Markison

20080238377 - Device for transforming and stabilizing a primary ac voltage for supplying an electric load: A device coupled to a primary AC voltage and a load includes an input, an inductive element coupled thereto, and a generator of a PWM control signal. A capacitor is coupled in parallel to the load. A first bidirectional switch couples the load and primary AC voltage during conduction phases.... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20080238378 - Voltage regulator: In some embodiments, a voltage regulator assembly comprises a first voltage regulator circuit selectively coupled to a first input voltage and comprising a first inductor, a second regulator circuit selectively coupled to the first input voltage and comprising a second inductor to inductively couple the second regulator circuit to the... Agent: Caven & Aghevli C/o Intellevate, LLC

20080238379 - Pulse frequency to voltage conversion: A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit.... Agent: Haverstock & Owens LLP

20080238381 - Device and method for voltage regulator with stable and fast response and low standby current: An apparatus and method for regulating voltage levels. The apparatus includes a first transistor and a second transistor. The first transistor and the second transistor are each coupled to a first current source and a second current source. Additionally, the apparatus includes a third transistor coupled to the second transistor... Agent: Townsend And Townsend And Crew, LLP

20080238380 - Hierarchical control for an integrated voltage regulator: A hierarchical control for an integrated voltage regulator may include a voltage regulator circuit with a plurality of parallel voltage cells, with each of the cells having a plurality of phases of interleaved voltage converters, and a feedback control associated with the cells to set identical current references for the... Agent: Grossman, Tucker, Perreault & Pfleger, PLLC C/o Intellevate, LLC

20080238382 - Anti-ringing switching regulator and control method therefor: The present invention discloses an anti-ringing switching regulator, comprising a variable resistor, a transistor, and an inductor electrically connected to a common node, in which the variable resistor is electrically connected with an input voltage, the transistor is electrically connected to ground, and the inductor is electrically connected to an... Agent: Tung & Associates / Randy W. Tung, Esq.

20080238383 - Power converter and multiport power converter: The DC/DC converter is that which is constituted so as to have a failure detecting circuit in which a first capacitor and a second capacitor are connected in series, a plurality of switches are switched according to a predetermined operating mode to select an inductor, the first capacitor and the... Agent: Squire, Sanders & Dempsey L.L.P.

20080238384 - Current source circuit and method of outputting current: A current source circuit includes a voltage output section which outputs a voltage signal; a current source section and a conversion section. The current source section has at least one current source block comprising a plurality of current sources, each of which outputs an output current. The conversion section is... Agent: Mcginn Intellectual Property Law Group, PLLC

20080238385 - Constant voltage circuit: A constant voltage circuit that is capable of realizing high speed response with respect to an abrupt change in an input voltage or a load current is disclosed. The constant voltage circuit includes a first error amplifier with a high direct current gain and a second error amplifier with high... Agent: Dickstein Shapiro LLP

20080238386 - Apparatus for delivering harmonic inductive power: Method and apparatus for providing harmonic inductive power, and more particularly for delivering current pulses providing a desired amount of pulse energy in high frequency harmonics to a load circuit for inductive heating of an article. By controlling the shape and/or frequency of such current pulses, the apparatus and method... Agent: Rissman Jobse Hendricks & Oliverio, LLP

20080238387 - Dual mode regulation loop for switch mode power converter: The invention relates to a DC-DC converter, which includes a power stage driven by a pulse width modulator, a first error amplifier with a first input coupled to a first reference voltage source and a second input coupled to a current sink through which a current is fed from an... Agent: Texas Instruments Incorporated

20080238388 - Power supply device and recording apparatus: A power supply device includes a DC-DC converter configured to regulate an output voltage based on an externally input instruction, and a discharge circuit connected to an output capacitor of the DC-DC converter, wherein the discharge circuit includes a switch element configured to switch between a conductive state and a... Agent: Canon U.s.a. Inc. Intellectual Property Division

20080238389 - Primary only control quasi resonant convertor: A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit.... Agent: Haverstock & Owens LLP

20080238393 - Centralized controller and power manager for on-board power systems: A controller for controlling a plurality of DC-DC switching cells each configured to generate an output voltage in response to receiving a PWM control signal from the controller. The controller includes a plurality of output ports for outputting a plurality of PWM control signals, and at least one input port... Agent: Harness, Dickey, & Pierce, P.l.c

20080238392 - Controller and driver communication for switching regulators: Pulse width modulation (PWM) controllers and output stage driver circuits and related methods of communicating switching regulator mode information. The controller includes circuitry that recognizes intervals when the load driven by the regulator is in a low power mode. Responsive to recognizing the low power mode, the controller generates a... Agent: Akerman Senterfitt

20080238391 - Current drive circuit and method: One embodiment relates to a control system. In one embodiment, a control system is configured to drive a load based on a set-point of the load, a measured load characteristic and a supply voltage of the load. The controller is configured to determine a duty cycle based on the load... Agent: Eschweiler & Associates LLC

20080238395 - Dc-dc converter, power supply system, and power supply method: According to an embodiment, a DC-DC converter comprises: an error amplifier that receives a soft start signal and amplifies a difference between an output voltage signal and a reference voltage signal; a PWM control circuit that controls ON and OFF states of a first switching transistor and a second switching... Agent: Arent Fox LLP

20080238394 - Dc-dc converter, power supply voltage supplying method, and power supply voltage supplying system: According to one aspect of the invention, a DC-DC converter including a soft-start function of a soft start in response to a soft-start signal, comprises: a detection circuit that detects whether the soft-start signal is active at an end of a soft-start operation; and an output voltage control circuit that... Agent: Arent Fox LLP

20080238390 - Dynamically adjusted multi-phase regulator: In some embodiments, a multi-phase converter with dynamic phase adjustment is provided.... Agent: Intel Corporation C/o Intellevate, LLC

20080238396 - Feedback controller having multiple feedback paths: A feedback controller comprises first and second feedback circuits. The first feedback circuit is connected between an input node and an output node and has an error node. The first feedback circuit comprising a feedback amplifier for comparing a feedback signal to a reference signal and providing an error signal,... Agent: Wells St. John P.s.

20080238397 - Circuit and method for soft start of a switching regulator from a residual voltage: For soft start of a switching regulator, the output voltage of the switching regulator is fed back to be compared with a ramp signal, in order to trigger a comparison signal when the ramp signal rises up to reach the feedback signal, to enable the switching regulator such that the... Agent: Rosenberg, Klein & Lee

20080238398 - Automatic current trimming method and circuits: Techniques pertaining to device and method for controlling an analog signal are disclosed. Using a single connection (e.g., a connector or a pin) without an external resistive element (e.g., a resistor), an analog output is digitally controlled and produced. According to one aspect of the present invention, a precisely controlled... Agent: Silicon Valley Patent Agency

20080238399 - Buffer circuit having multiplexed voltage level translation: A buffer circuit is selectively operative in one of at least a first mode and a second mode as a function of a first control signal supplied to the buffer circuit. The buffer circuit includes interface circuitry operative to receive at least second and third control signals referenced to a... Agent: Ryan, Mason & Lewis, LLP

20080238400 - Bandgap voltage and current reference: Circuits and methods that improve the performance of reference circuits are provided. A reference generator circuit maintains a substantially constant output current over an extended temperature for use as a reference. Output current fluctuations caused by a poorly specified power source or process variations are minimized or eliminated.... Agent: Mcdermott Will & Emery LLP

20080238401 - Method and apparatus for adjusting a reference: A circuit includes a current divider to divide a current from a current source into a first current and a reference current. The circuit also includes a current mirror coupled to the current divider to receive the first current from the current divider and to receive an adjustment current. The... Agent: Blakely Sokoloff Taylor & Zafman LLP

20080238402 - Control unit: A control unit includes an input terminal and an output terminal for a signal to be controlled, a control input terminal and a control output terminal for a control signal, variable capacitors connected in a bridge configuration between the input terminal and control input terminal, between the input terminal and... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.