Oscillators inventions 01/06

20060017510 - Semiconductor integrated circuit: A semiconductor integrated circuit capable of performing internal oscillation with high precision is provided. The semiconductor integrated circuit has a memory circuit, an oscillator circuit for generating an internal clock signal based on control information held in the memory circuit, a logic circuit for generating control information for causing the...

20060017511 - 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...

20060017512 - Circuit for detecting phase errors and generating control signals and pll using the same: A circuit for detecting phase errors and generating control signals includes a digital phase detector and a digital filter. The digital phase detector receives an input signal and a reference signal and generates a set of phase error control signals, and the digital filter receives the phase error control signals...

20060017513 - Voltage controlled oscillator with linear capacitance: The voltage controlled oscillator comprises an amplifier and an oscillating system comprising an inductor and a first and second variable capacitor connected in series, each having a capacitance varying according to its control voltage. The capacitance of one of the variable capacitors varies in the same direction as its control...

20060017514 - Ring oscillator setting apparatus and method depending on environmental changes of an image formation apparatus: A ring oscillator setting apparatus and method depending on an environmental change of an image formation apparatus is provided. The apparatus includes a plurality of ring oscillators for generating different oscillation frequencies. The apparatus further includes a loopspeed detection unit to detect a loopspeed representing the number of pulses generated...

20060017515 - Cmos negative resistance/q enhancement method and apparatus: An apparatus for optimizing a quality factor Q associated with an electrical resonator system includes an LC resonator and an optimizing circuit for providing a negative resistance. The optimizing circuit is electrically coupled to the resonator circuit, and includes two CMOS transistor pairs with the gates of the PMOS transistors...

20060017516 - Small crystal with grounded package: A small crystal oscillator with metal packaging includes a small size crystal oscillator circuit, a body encompassing the small size crystal oscillator circuit, first and second terminal leads coupled to the crystal oscillator circuit through the body, metal packaging encompassing at least a portion of the body, and a ground...

20060017517 - Voltage controlled oscillator: A voltage controlled oscillator enables controlling the MOS transistor threshold voltage independently of the temperature compensation control signal and external voltage frequency control signal. The voltage controlled oscillator has a crystal oscillator and a load capacitance is parallel connected to a crystal oscillator. The load capacitance includes a first MOS...

20060017519 - Low-latency start-up for a monolithic clock generator and timing/frequency reference: An apparatus, system and method are provided for low-latency start-up of a free-running harmonic oscillator. The exemplary apparatus embodiment comprises a first and second current sources to generate first and second currents; a bias current monitor adapted to detect a magnitude of the second current and to provide a control...

20060017518 - Method and apparatus for reducing the start time of a vcxo: A voltage controlled oscillator, such as a VCXO (Voltage Controlled Crystal Oscillator), for generating a desired reference frequency in a wireless terminal with a reduced start-up time is described herein. According to the present invention, the VCXO comprises an oscillator that generates the desired reference frequency based on a variable...

20060012439 - Linear phase detector and charge pump: A phase detector detects a phase difference between a first and second signal received by a phase detector. A charge is supplied by a charge pump circuit that corresponds to the phase difference using a phase difference to charge conversion that is substantially linear and nonzero in a phase error...

20060012440 - Phase locked loop: The invention is directed to a phase locked loop. The phase locked loop comprises a variable frequency divider for performing a fraction frequency division by switching a dividing value having an integer portion and a fraction portion; a memory for storing the fraction portion; and a data converter for adding...

20060012438 - Phase locked loop with nonlinear phase-error response characteristic: A phase-locked loop includes a phase/frequency detector for generating phase error signal according to a reference signal and an input signal, a charge pump for outputting a voltage signal according to the phase error signal, a voltage-controlled oscillator for outputting an output signal corresponding to the phase error signal according...

20060012441 - Phase-locked loop with conditioned charge pump output: A phase-locked loop system configured to cause an output signal to tend toward a desired output frequency. The phase-locked loop system includes a charge pump system configured to produce a charge pump output based on differences detected between the output signal and the desired output frequency. The phase-locked loop system...

20060012442 - Semiconductor integrated circuit with pll circuit: In a PLL circuit including an oscillator, a phase comparator, a charge pump circuit, and a loop filter, without providing a plurality of capacitative elements, that is, without increasing the occupied area so much, the characteristics of the PLL circuit can be adjusted according to manufacture variations in a resistive...

20060012443 - Oscillator circuit for a sensor: An oscillator circuit for a sensor, with a tuned circuit (2) and an operational amplifier (3), the electrical oscillation of the tuned circuit (2) is capable of being tapped between a first terminal (4) and a second terminal (5) of the tuned circuit (2), and the first terminal (4) of...

20060012444 - Multiplier crystal oscillator: The present invention has a configuration such that in a multiplier crystal oscillator wherein a multilayer board having earthing metal films on both principal planes of an intermediate board, and mount boards laminated on both sides thereof, and at least one multiplier LC filter is arranged on one principal plane...

20060012445 - Voltage controlled oscillator: In a voltage controlled oscillator including an amplifier, a feedback circuit and a crystal oscillator, two MOS transistors M1, M2 are connected for use as variable capacity elements for the frequency adjustment of the voltage controlled oscillator. Drains of the MOS transistors M1, M2 are respectively connected to an XT...

20060012446 - Temperature compensated oven controlled crystal oscillator: A method provides a temperature controlled frequency source. The method reduces the effects of temperature variations on an operating frequency of the temperature controlled frequency source by temperature compensating the temperature controlled frequency source....

20060012447 - Amplitude control circuit: An amplitude control circuit comprises a first circuit configured to receive differential signals and provide a first signal based on the amplitudes of the differential signals, a second circuit configured to receive a bias signal and provide a second signal based on the bias signal, and a third circuit configured...

20060006951 - Digital control loop to improve phase noise performance and rx/tx linearity: A system or method for controlling a voltage controlled oscillator (VCO) or LO buffer includes an amplitude detector for detecting an amplitude value at a node corresponding to the at least one output line. A comparator compares the detected amplitude value with a predetermined amplitude value, and outputs a first...

20060006952 - Frequency synthesizer and method for operating a frequency synthesizer: A frequency synthesizer, especially for use with a time-base generator of a fill-level meter employing the radar principle is designed to output a first frequency signal and a second frequency signal at mutually slightly different frequencies. The synthesizer incorporates a reference oscillator operating at a reference frequency and a control...

20060006953 - Frequency synthesizer and method for operating a frequency synthesizer: A frequency synthesizer, especially for use with a time-base generator of a fill-level meter employing the radar principle is designed to output a first frequency signal and a second frequency signal at mutually slightly different frequencies. The synthesizer incorporates a reference oscillator operating at a reference frequency and a control...

20060006954 - Voltage controlled lc tank oscillator: Voltage controlled oscillator comprising a LC tank circuit (L, C, R) coupled to modulator means (2) and characterized in that the modulator means (2) are coupled to amplifier means (1) via an adder (3) for generating a quadrature periodical output signal having a frequency in a relative wide range, the...

20060001494 - Cascaded locked-loop circuits deriving high-frequency, low noise clock signals from a jittery, low-frequency reference: An integrated circuit includes clock synthesis and distribution circuitry that includes cascaded PLLs to deliver low-noise transmit and receive clock signals that can be tuned over a broad range of frequencies. The clock synthesis circuitry derives a low-jitter intermediate reference clock signal IRClk from a relatively noisy, low-frequency external reference...

20060001496 - Array oscillator and polyphase clock generator: The present invention relates generally to array oscillator circuits for use as phase delay generators. More particularly, the present invention relates to a novel array oscillator for providing a plurality of phases which have stable phase relationships. The present invention is particularly applicable to the generation of poly-phase clocks for...

20060001495 - Oscillating divider topology: An oscillator includes a first circuit that asynchronously generates an oscillating signal in response to a second circuit of the oscillator acknowledging each cycle of the oscillating signal....

20060001497 - Magnetic actuator trip and close circuit and related methods: A circuit for a recloser controls the flow of current through an actuator coil to selectively open or close the electrical contacts of the recloser. The circuit utilizes pairs of transistors and pairs of diodes to apply the charge on a capacitor to open or close the contacts and to...

20060001498 - Fractional divider system and method: The present invention relates to a fractional divider system for a low-power timer with reduced timing error at wake-up. The fractional divider system includes a fractional divider circuit operable to produce an output signal. The fractional divider system also includes a high speed crystal oscillator connected to the fractional divider...