Oscillators inventions 09/06

20060208803 - Phase frequency detector with programmable delay: Methods and systems for locking a phase locked loop (PLL) are disclosed herein. A first impulse signal may be generated utilizing an input reference signal. A second impulse signal may be generated utilizing an input divided signal. A programmable delay signal may be generated based on the generated first impulse...

20060208805 - Linear phase-locked loop with dual tuning elements: A linear PLL includes a VCO with first and second tuning elements. The first tuning element is adjusted in proportion to the phase error between an input signal and a VCO signal and the second tuning element is adjusted by an integral function of the phase error. By configuring the...

20060208808 - Method and system for calibrating input voltage of voltage controlled oscillator and digital interface used for calibrating input voltage: A method and a system for calibrating an input voltage of a voltage controlled oscillator and a digital interface used for calibrating the input voltage. The method includes: setting a lock detection time for tuning a signal phase; setting a lock detection voltage section; setting output frequency values at predetermine...

20060208807 - Multi-modulus divider for high speed applications: A multi-modulus divider for high speed applications is provided and may comprise a multistage divider generating a divided signal from an output portion of a divider module for a current stage. The divided signal may be fed back to an input portion of the divider module in the current stage...

20060208804 - Phase-locked loop with vco tuning sensitivity compensation: The invention provides a phase-locked loop (PLL). Since a loop bandwidth of the PLL is a function of a gain of a phase detector and a gain of a voltage controlled oscillator (VCO), by adjusting the gain of the phase detector, the variation of the gain of the VCO (i.e.,...

20060208806 - Vco with switchable varactor for low kvco variation: A method and system for VCO with switchable varactor for low KVCO variation is provided. Aspects of a method for controlling a signal may comprise controlling an oscillating frequency of a time varying signal in a circuit, and controlling a change in the oscillating frequency based on switching of a...

20060208809 - Precharge circuit: A precharge circuit that initializes an electronic filter to a middle voltage level of an operational voltage includes a filter isolation device, a filter communication device, and an initializing device. The filter isolation device isolates the electronic filter from electronic circuits connected to an input and an output of the...

20060208810 - Push compensation in an oscillator: The effect of supply voltage variations on an oscillator circuit output are compensated for to reduce supply pushing. The change in a value of a first capacitance in a first direction in response to the variation in the supply voltage is canceled using one or more diodes having a capacitance...

20060208811 - Multi-phase clock generator and method thereof: A multi-phase clock generator for generating a set of multi-phase clock signals is disclosed. The multi-phase clock generator includes a signal generator, a phase adjusting circuit, and a phase interpolator. The signal generator generates a plurality of first clock signals according to a reference clock signal. The phase adjusting circuit,...

20060208812 - Oscillator circuit and oscillation control method: An oscillator circuit is disclosed that includes a first oscillation part configured to output a first oscillation output by charging and discharging a first capacitor, and a second oscillation part configured to output a second oscillation output by charging and discharging a second capacitor. The second oscillation part includes a...

20060208813 - Method and apparatus for creating a multiple loop vco: Disclosed herein is a method and apparatus used to create an idealized voltage controlled oscillator (VCO) which allows very high modulation rates without the expected phase noise (jitter) which nominally comes from wide bandwidth VCOs. In this fashion, high quality VCOs that typically offer pure signals at the cost of...

20060208815 - Amplifier circuit for an oscillator in a defined oscillating frequency range and oscillator circuit: An amplifier circuit for an oscillator in a defined oscillating frequency range includes a plurality of transconductors, wherein at least one transconductor has a positive transconductance, and wherein at least one other transconductor has a negative transconductance, wherein the transconductors together provide a positive amplification, and a passive impedance element...

20060208814 - Low phase noise crystal oscillator with supply noise filtering: A low phase noise crystal oscillator with supply noise filtering is provided and may comprise receiving an input voltage at a positive potential input of an oscillator circuit, which may comprise an oscillator core and a buffer coupled to an output of the oscillator core. Noise caused by the input...

20060208816 - Piezo-oscillator: Deterioration in frequency stability with time in a conventional piezoelectric oscillator using an accumulation type MOS capacitance element is improved. A P-channel transistor type or an N-channel transistor type is used as a MOS capacitance element in a variable capacitance circuit used in a piezoelectric oscillator. A bias voltage is...

20060208817 - Piezoelectric oscillator: A piezoelectric oscillator includes an inverter amplifier, a first load impedance constituting together with the inverter amplifier a connection circuit that is inserted between the power supply and the ground, a piezoelectric resonator being inserted between the input of the inverter amplifier and the ground, a second load impedance being...

20060208819 - Oscillating circuit for suppressing second harmonic wave: An oscillating circuit includes an oscillating transistor in which the collector or the base is grounded in a high-frequency manner, and a bias resistor connects the emitter of the oscillating transistor to a ground in a direct-current manner. In the oscillating circuit, a resonance unit, having maximum impedance at the...

20060208818 - Variable degeneration impedance supply circuit using switch and electronic circuits using the same: A variable degeneration impedance supply circuit, including: two alternatively connected transistors; a capacitor circuit having a predetermined capacitance and serially connecting output terminals of the two transistors; and a switch for controlling on/off state between the capacitor circuit and the output terminal, according to a predetermined first control signal. The...

20060202768 - Phase locked loop comprising a sigma-delta modulator: The invention is directed to a phase locked loop with a ΣΔ modulator. A multimodulus divider in the feedback path of the PLL is actuated by the ΣΔ modulator. The latter has a design which can be described by a complex transfer function H(s) in the Laplace plane, said transfer...

20060202767 - Voltage-controlled oscillator comprising a circuit for compensating frequency pulling: The present invention relates to a method for stabilising the operation of a voltage controlled oscillator (VCO) driven by a phase locked loop (PLL), the voltage controlled oscillator delivering an RF signal and receiving through at least one spurious path a harmonic component of a frequency equal or proximate to...

20060202769 - Piezoelectric thin film device and method of producing the same: A piezoelectric thin film device (10) comprising a substrate (12) having a vibration space (20), and a piezoelectric lamination structure (14) formed on the upper surface of the substrate, the piezoelectric lamination structure comprising a piezoelectric film (16) and a lower electrode (15) and upper electrode (17) which are formed...

20060202770 - Dielectric resonator oscillator and radar apparatus using the same: At least one of a rise time and a fall time of a dielectric resonator oscillator are reduced. The dielectric resonator oscillator includes a dielectric resonator, a drive circuit for applying a resonance voltage to the dielectric resonator, a switch for applying a voltage required for generating the resonance voltage...

20060202771 - Clock signal output apparatus and control method of same, and electric apparatus and control method of same: The clock signal output device has a crystal oscillator (41) for generating a reference clock signal (CL1) and generating and outputting an output clock signal (CL0) having a prescribed frequency on the basis of the reference clock signal (CL1). The device also has an atomic oscillator (42) for generating a...

20060202772 - Temperature-compensated piezoelectric oscillator: A temperature compensated piezoelectric oscillator includes: an oscillation circuit that drives a piezoelectric element with a current; a direct-current-stopping fixed capacitor; a frequency-temperature compensated circuit that compensates the deviation of an oscillation frequency caused by a change of temperature; and a piezoelectric transducer which includes a piezoelectric element driven in...

20060202773 - Mos varactor and voltage-controlled oscillator using the same: To provide a MOS varactor in which oscillation frequency variation is small and variation in a capacitance changing voltage is small, and a voltage-controlled oscillator using the MOS varactor, as a load capacitor of an oscillating circuit composed of a feedback resistor 1, an amplifier 2, and a crystal vibrator...

20060197604 - Phase locked loop for controlling an optical recording device and method thereof: A phase locked loop (PLL) system for generating a reference clock to write recording data on an optical medium includes a clock generator generating the reference clock according to a phase difference between the reference signal and a first frequency-divided signal; a phase-shift detector generating a phase adjusting signal; and...

20060197603 - Semiconductor integrated circuit with function to detect state of stable oscillation: A semiconductor integrated circuit includes a reference-voltage circuit configured to produce a predetermined reference voltage at an output node thereof, a comparator, coupled to a node to which an oscillating signal is supplied and to the output node of the reference-voltage circuit, to produce a result of comparison at an...

20060197605 - Broadband modulation pli, and modulation factor adjusting method therefor: With respect to a PLL portion including VCO (21), a divider (22), a phase comparator (23), and a loop filter (24), a dividing ratio of the divider (24) is modulated by a dividing ratio generating portion (29) by controlling a control voltage of VCO (21) by a control signal generating...

20060197612 - Electric circuit and oscillator comprising said electric circuit: An electric circuit includes a circuit path from a first reference voltage to a second reference voltage lower than the first reference voltage. The patha current generator, a capacitor, a first switching element suitable for connecting or disconnecting the capacitor with respect to the current generator. The first switching element...

20060197606 - Feedback control circuit: The output amplitude of a variable gain amplifier is compared with a reference value by a differential amplifier. When the amplitude is less than the reference value, the gain of the variable gain amplifier is increased to augment the output amplitude. When the amplitude is greater than the reference value,...

20060197613 - Frequency modulation linearization system for a fractional-n offset pll: A linearization system is provided for a Fractional-N Offset Phase Locked Loop (FN-OPLL) in a frequency or phase modulation system. In general, the linearization system processes a modulation signal to provide a linearized modulation signal to a fractional-N divider in a reference path of the FN-OPLL such that a frequency...

20060197608 - Fully programmable phase locked loop: A programmable PLL including a receiver, a phase frequency detector, a charge pump, and a VCO. The receiver includes a programmable capacitor voltage divider that shifts voltage of an input clock to provide a level-shifted clock. The AC interface includes a state detection and correction circuit that ensures proper state...

20060197607 - Measurement and data acquisition system including a real-time monitoring circuit for implementing control loop applications: A measurement and data acquisition system including a real-time monitoring circuit for implementing control loop applications. The system control loop may include the real-time monitoring circuit, a data acquisition device, a processing unit, and a plurality of subsystems. The subsystems may be comprised in the data acquisition device or may...

20060197611 - Phase-locked loop circuits with current mode loop filters: A phase-locked loop (PLL) includes a phase-frequency detector circuit configured to detect an error of an output clock signal in relation to a reference clock signal and to generate a charge pump control signal therefrom and a charge pump circuit configured to charge and discharge an output node thereof responsive...

20060197610 - Voltage controlled oscillator: A voltage controlled oscillator which performs an oscillating operation at a frequency corresponding to a control voltage, includes a voltage-current converter circuit which converts the control voltage to a control current corresponding to a voltage value thereof, and a ring oscillator through which an operating current corresponding to the control...

20060197609 - Voltage-controlled oscillator with gain proportional to operating frequency: Embodiments of the invention include a voltage-controlled oscillator (VCO) circuit in which the gain of the VCO is proportional to the output or operating frequency of the VCO. The VCO circuit includes a voltage-controlled oscillator, a current scaling block, and a summing node. The summing node couples a VCO control...

20060197614 - Multi-phase realigned voltage-controlled oscillator and phase-locked loop incorporating the same: A multi-phase realigned voltage-controlled oscillator (MRVCO) achieves phase realignment based on charge injection in the VCO stages with the injection amount proportional to the instantaneous phase error between the VCO output clock and a reference clock. The MRVCO may be incorporated as part of an implementation of a multi-phase realigned...

20060197615 - Ultra low power oscillator: An ultra low power oscillator includes a current supply unit converting current supplied from an external bias power source into first and second low currents of predetermined amounts, and an oscillation unit oscillating and creating a predetermined frequency signal if the first and second low currents are supplied from the...

20060197616 - Oscillating buffer with single gate oxide devices: An oscillating buffer is coupled to an oscillating source, in parallel, for providing a predetermined waveform at a predetermined frequency for a core circuit with a plurality of MOS transistors operating at a core voltage. In one embodiment, the oscillating buffer includes an inverter, coupled between the core voltage and...

20060197617 - Ultra wide band signal generator: Disclosed is an ultra wide band signal generator. The ultra wide band signal generator generates a signal of a required frequency using a harmonic signal having a frequency range of a ultra wide band (UWB). The ultra wide band signal generator includes an active inductor for generating harmonic signals having...

20060197618 - Pulse generator and the transmitter with a pulse generator: The object is simplification of a configuration in a pulse generator for UWB transmission, lower power consumption, and suppression of LO leakage by nonuse of the LO signal. A pulse generator comprises: a clock generator (CLK) for giving clock of a predetermined period; a delay circuit (DLY) equipped with a...

20060197620 - Dual mode tuning digitally controlled crystal oscillator and operation method thereof: A dual mode tuning digitally controlled crystal oscillator includes a crystal resonator, an oscillation circuit, a coarse mode tuning unit and a fine mode tuning unit. The crystal resonator resonates at substantially a predetermined resonance frequency. The oscillation circuit generates an oscillation frequency based on the resonance frequency to output...

20060197619 - Piezoelectric oscillator and manufacturing method thereof: A step of chemically polishing a surface without an integrated circuit of a silicon wafer 31 (step S2), a step of cleaning the silicon wafer 31 (step S3), a step of cutting the silicon wafer 31 into individual pieces of IC chip 6 (step S5), a step of bonding the...

20060197621 - Complementary metal oxide semiconductor voltage controlled oscillator: A complementary metal oxide semiconductor voltage controlled oscillator is provided. The voltage controlled oscillator includes an LC tank which is supplied with a power supply voltage, the LC tank oscillating at a certain frequency; a negative resistor including first and second N-channel metal oxide semiconductor field effect transistors (NMOS FETs)...

20060197622 - Variable inductance applying device using variable capacitor and variable frequency generating device thereof: Disclosed is a variable inductance applying device using a variable capacitor, and a variable frequency generating device thereof. The variable inductance applying device includes: a first inductor whose both terminals are connected to an inductance applying terminal applying inductance to an external circuit; a second inductor inductively coupled to the...

20060197623 - Method and apparatus for biasing a metal-oxide-semiconductor capacitor for capacitive tuning: A method and apparatus is presented for generating a reference voltage that biases a metal-oxide-semiconductor (MOS) transistor used as a varactor in capacitive tuning applications. In one embodiment, a biasing circuit is implemented. The biasing circuit comprises a diode-clamped FET and an element coupled to the diode-clamped FET at a...

20060197604 - Phase locked loop for controlling an optical recording device and method thereof: A phase locked loop (PLL) system for generating a reference clock to write recording data on an optical medium includes a clock generator generating the reference clock according to a phase difference between the reference signal and a first frequency-divided signal; a phase-shift detector generating a phase adjusting signal; and...

20060197603 - Semiconductor integrated circuit with function to detect state of stable oscillation: A semiconductor integrated circuit includes a reference-voltage circuit configured to produce a predetermined reference voltage at an output node thereof, a comparator, coupled to a node to which an oscillating signal is supplied and to the output node of the reference-voltage circuit, to produce a result of comparison at an...

20060197605 - Broadband modulation pli, and modulation factor adjusting method therefor: With respect to a PLL portion including VCO (21), a divider (22), a phase comparator (23), and a loop filter (24), a dividing ratio of the divider (24) is modulated by a dividing ratio generating portion (29) by controlling a control voltage of VCO (21) by a control signal generating...

20060197612 - Electric circuit and oscillator comprising said electric circuit: An electric circuit includes a circuit path from a first reference voltage to a second reference voltage lower than the first reference voltage. The patha current generator, a capacitor, a first switching element suitable for connecting or disconnecting the capacitor with respect to the current generator. The first switching element...

20060197606 - Feedback control circuit: The output amplitude of a variable gain amplifier is compared with a reference value by a differential amplifier. When the amplitude is less than the reference value, the gain of the variable gain amplifier is increased to augment the output amplitude. When the amplitude is greater than the reference value,...

20060197613 - Frequency modulation linearization system for a fractional-n offset pll: A linearization system is provided for a Fractional-N Offset Phase Locked Loop (FN-OPLL) in a frequency or phase modulation system. In general, the linearization system processes a modulation signal to provide a linearized modulation signal to a fractional-N divider in a reference path of the FN-OPLL such that a frequency...

20060197608 - Fully programmable phase locked loop: A programmable PLL including a receiver, a phase frequency detector, a charge pump, and a VCO. The receiver includes a programmable capacitor voltage divider that shifts voltage of an input clock to provide a level-shifted clock. The AC interface includes a state detection and correction circuit that ensures proper state...

20060197607 - Measurement and data acquisition system including a real-time monitoring circuit for implementing control loop applications: A measurement and data acquisition system including a real-time monitoring circuit for implementing control loop applications. The system control loop may include the real-time monitoring circuit, a data acquisition device, a processing unit, and a plurality of subsystems. The subsystems may be comprised in the data acquisition device or may...

20060197611 - Phase-locked loop circuits with current mode loop filters: A phase-locked loop (PLL) includes a phase-frequency detector circuit configured to detect an error of an output clock signal in relation to a reference clock signal and to generate a charge pump control signal therefrom and a charge pump circuit configured to charge and discharge an output node thereof responsive...

20060197610 - Voltage controlled oscillator: A voltage controlled oscillator which performs an oscillating operation at a frequency corresponding to a control voltage, includes a voltage-current converter circuit which converts the control voltage to a control current corresponding to a voltage value thereof, and a ring oscillator through which an operating current corresponding to the control...

20060197609 - Voltage-controlled oscillator with gain proportional to operating frequency: Embodiments of the invention include a voltage-controlled oscillator (VCO) circuit in which the gain of the VCO is proportional to the output or operating frequency of the VCO. The VCO circuit includes a voltage-controlled oscillator, a current scaling block, and a summing node. The summing node couples a VCO control...

20060197614 - Multi-phase realigned voltage-controlled oscillator and phase-locked loop incorporating the same: A multi-phase realigned voltage-controlled oscillator (MRVCO) achieves phase realignment based on charge injection in the VCO stages with the injection amount proportional to the instantaneous phase error between the VCO output clock and a reference clock. The MRVCO may be incorporated as part of an implementation of a multi-phase realigned...

20060197615 - Ultra low power oscillator: An ultra low power oscillator includes a current supply unit converting current supplied from an external bias power source into first and second low currents of predetermined amounts, and an oscillation unit oscillating and creating a predetermined frequency signal if the first and second low currents are supplied from the...

20060197616 - Oscillating buffer with single gate oxide devices: An oscillating buffer is coupled to an oscillating source, in parallel, for providing a predetermined waveform at a predetermined frequency for a core circuit with a plurality of MOS transistors operating at a core voltage. In one embodiment, the oscillating buffer includes an inverter, coupled between the core voltage and...

20060197617 - Ultra wide band signal generator: Disclosed is an ultra wide band signal generator. The ultra wide band signal generator generates a signal of a required frequency using a harmonic signal having a frequency range of a ultra wide band (UWB). The ultra wide band signal generator includes an active inductor for generating harmonic signals having...

20060197618 - Pulse generator and the transmitter with a pulse generator: The object is simplification of a configuration in a pulse generator for UWB transmission, lower power consumption, and suppression of LO leakage by nonuse of the LO signal. A pulse generator comprises: a clock generator (CLK) for giving clock of a predetermined period; a delay circuit (DLY) equipped with a...

20060197620 - Dual mode tuning digitally controlled crystal oscillator and operation method thereof: A dual mode tuning digitally controlled crystal oscillator includes a crystal resonator, an oscillation circuit, a coarse mode tuning unit and a fine mode tuning unit. The crystal resonator resonates at substantially a predetermined resonance frequency. The oscillation circuit generates an oscillation frequency based on the resonance frequency to output...

20060197619 - Piezoelectric oscillator and manufacturing method thereof: A step of chemically polishing a surface without an integrated circuit of a silicon wafer 31 (step S2), a step of cleaning the silicon wafer 31 (step S3), a step of cutting the silicon wafer 31 into individual pieces of IC chip 6 (step S5), a step of bonding the...

20060197621 - Complementary metal oxide semiconductor voltage controlled oscillator: A complementary metal oxide semiconductor voltage controlled oscillator is provided. The voltage controlled oscillator includes an LC tank which is supplied with a power supply voltage, the LC tank oscillating at a certain frequency; a negative resistor including first and second N-channel metal oxide semiconductor field effect transistors (NMOS FETs)...

20060197622 - Variable inductance applying device using variable capacitor and variable frequency generating device thereof: Disclosed is a variable inductance applying device using a variable capacitor, and a variable frequency generating device thereof. The variable inductance applying device includes: a first inductor whose both terminals are connected to an inductance applying terminal applying inductance to an external circuit; a second inductor inductively coupled to the...

20060197623 - Method and apparatus for biasing a metal-oxide-semiconductor capacitor for capacitive tuning: A method and apparatus is presented for generating a reference voltage that biases a metal-oxide-semiconductor (MOS) transistor used as a varactor in capacitive tuning applications. In one embodiment, a biasing circuit is implemented. The biasing circuit comprises a diode-clamped FET and an element coupled to the diode-clamped FET at a...