Class 331/36R - Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.)

Subclass of Class 331 - Oscillators
Definition: Subject matter wherein the particular frequency control
No. of patents: 32
Last issue date: 03/13/2012

Number	Title	Issue Date
8134414	Clock, frequency reference, and other reference signal generator with frequency stability over temperature variation Exemplary embodiments provide a reference signal generator having a reference or center frequency within a predetermined variance over variations in temperature within a specified range. An exemplary apparatus comprises a reference resonator to generate a first refe...	03/13/2012
7221921	Partitioning of radio-frequency apparatus Components of a radio-frequency (RF) apparatus including transceiver circuitry and frequency modification circuitry of a crystal oscillator circuit that generates a reference signal with adjustable frequency may be partitioned in a variety of ways, for example, as o...	05/22/2007
7200364	Frequency modification circuitry for use in radio-frequency communication apparatus and associated methods Frequency modification circuitry may be employed as part of a crystal oscillator circuit to generate a reference signal with adjustable frequency. The frequency modification circuitry may be implemented as part of a crystal oscillator circuit that includes digitally...	04/03/2007
7170354	Oscillator circuit with laser-trimmable load impedance An oscillator circuit for generating signals with a predetermined oscillator frequency is provided. The oscillator circuit has at least one resonator and at least one load impedance connected to the resonator. The oscillator circuit may be fully automatically trimme...	01/30/2007
7154342	Phase locked loop circuit with a tunable oscillator and an independent frequency converter and frequency counter A phase regulating arrangement or circuit is disclosed, in which, in addition to a frequency divider, which is arranged in the feedback path of the PLL and, provision is made of a further frequency counter. The frequency counter is configured to be readable and is l...	12/26/2006
7129788	Method and apparatus for driving a direct current or voltage controlled oscillator with modulation slope feedback A d.c. signal controlled oscillator includes a frequency-determining network having a control input and a modulation input. A phase regulating loop includes the oscillator and components that provide a control signal to the control input. A circuit apparatus for dri...	10/31/2006
7042253	Self-calibrating, fast-locking frequency synthesizer A frequency synthesizer for dual-band high frequency RF application. The frequency synthesizer first uses a frequency-locked loop circuit (“FLL”) to achieve self-calibration and frequency-locking, and then uses a phase-locked loop circuit (“PLL”) to achieve ...	05/09/2006
7035607	Systems and methods for providing an adjustable reference signal to RF circuitry Frequency modification circuitry may be employed as part of a crystal oscillator circuit to generate a reference signal with adjustable frequency. The frequency modification circuitry may be implemented as part of a crystal oscillator circuit that includes digitally...	04/25/2006
6967540	Synthesizers incorporating parascan TM varactors A synthesizer incorporating voltage tunable capacitors, comprising at least one resonator coupled into a base circuit of a bipolar transistor, the at least one resonator including at least one voltage tunable capacitor; the bipolar transistor including a collector w...	11/22/2005
6956416	Powerup control of PLL An electronic device, such as a microprocessor, with a timing circuit. The timing circuit contains a phase locked loop that, during a first interval, checks whether a control signal in the phase locked loop is between a maximum allowed value and a minimum allowed va...	10/18/2005
6946919	Controllable crystal oscillator component A frequency-adjustable oscillator suitable for digital signal clock synchronization comprises a crystal oscillator circuit for generating a driving signal and having a voltage-variable control input for adjusting a frequency of the driving signal, a phase detector c...	09/20/2005
6907236	Mixer for dual conversion receiver The invention concerns a mixer, in particular for an dual conversion receiver. The mixer includes a first variable transconductance stage (A) controlled by a high frequency carrier signal, this first stage including first (37) and second (38) terminals...	06/14/2005
6873214	Use of configurable capacitors to tune a self biased phase locked loop A phase locked loop (PLL) comprising an input, an output, a charge generator, a low pass filter 3, an oscillator 4 and a frequency divider 5. The frequency divider 5 has an input coupled to the output of the PLL and an output coupled to a...	03/29/2005
6806781	Tuning circuit having electronically trimmed VCO A voltage controlled oscillator (38) includes an LC tank (20) and a capacitor bank (21). LC tank (20) includes an inductor (12) and a varactor (14). The capacitive output of the varactor is controlled by a control voltage ν...	10/19/2004
6801097	Wideband VCO resonant circuit method and apparatus A wideband Voltage Controlled Oscillator (VCO) uses a resonant circuit tunable over a wide range of resonant frequencies. The resonant circuit includes voltage variable elements such that the resonant frequency, and thus the frequency of oscillation, may be electron...	10/05/2004
6788160	Oscillator circuit connected to a voltage source providing a substantially constant supply voltage The invention relates to a voltage-controlled oscillator circuit including an oscillator circuit connected to a voltage source furnishing a substantially constant supply voltage, and comprising at least one varactor, and a control voltage generator circuit whose out...	09/07/2004
6546059	Adaptive integrated PLL loop filter A loop filter in the phase-locked loop includes a capacitor having a specific capacitance value. The loop filter also includes an amplifier coupled to a node of the capacitor. The amplifier amplifies a signal at the node in a way that increases the equiva...	04/08/2003
6496556	Step-down clock control and method for improving convergence for a digitally controlled self-calibrating VCO A PLL system (200) includes a clock sequence generator (190). Clock sequence generator (190) provides a clock that steps down from a fast frequency through several steps to a frequency of zero. This step-down non-linear digression of frequencies causes a ...	12/17/2002
5850163	Active inductor oscillator with wide frequency range An active inductor oscillator includes a tank circuit for generating a first differential signal, a common-mode inverting differential buffer for generating a second differential signal in response to the first differential signal, and an integrating circ...	12/15/1998
5841324	Charge-based frequency locked loop and method A frequency locked loop (FLL) having an oscillator whose output frequency controls the amount of charge provided by a switched feedback capacitor to a charge integrator whose output voltage controls the frequency of the oscillator. A switched reference ca...	11/24/1998
5777522	Electronic device for controlling a reactance value for a reactive element A capacitor (200) having an actual physical capacitance value of Cact and is coupled to an oscillator (36). The oscillation frequency of the oscillator (36) can be changed by changing the effective capacitance of the capacitor (200). The actual capacitanc...	07/07/1998
5770975	Phase-locked loop circuit having a high-speed forcible pulling-in function The phase-locked loop circuit provided by the present invention has a voltage-controlled oscillating circuit that has a nonlinear characteristic representing the relation between the control voltage applied to the voltage-controlled oscillating circuit an...	06/23/1998
5709811	Magnetic material for microwave and high-frequency circuit component using the same A magnetic material for microwave, comprising a phase having garnet structure, said phase comprising a component represented by Formula I (A3-a Bia)Bx Oy Formula I where A represents a component com...	01/20/1998
5610560	Oscillator with switched reactive elements A phase-locked-loop circuit includes an oscillator having switched capacitors that are selectively coupled to a positive feedback path of the oscillator in a coarse frequency error correction mode of operation. When the frequency error is small, the circu...	03/11/1997
5596301	Apparatus for a synthesized reactance controlled oscillator usable in a phase locked loop The output frequency (14) of an oscillator circuit (10) can be controlled by replacing at least one of the reactive components (40), such as a capacitor or inductor, with a synthesized element (22). The synthesized element creates a signal that correspond...	01/21/1997
5570398	Method and apparatus for dynamic pole-zero reconfiguration for use with hard disc drive servos, electronic filters and other circuits A second order PLL uses on-chip dynamically configurable compensation to permit varying loop bandwidth and damping ratio simultaneously in response to command signals. In a first embodiment, a type 2 PLL is compensated by synthesizing a two-pole lowpass f...	10/29/1996
5195045	Automatic impedance matching apparatus and method An automatic impedance matching apparatus for matching an RF-signal generator to a load, such as a plasma etching chamber, is disclosed. The matching apparatus comprises a matching network having two variable impedance devices, a tune detector for detecti...	03/16/1993
5001649	Linear power control for ultrasonic probe with tuned reactance There is disclosed herein a driver system for an ultrasonic probe for allowing a user to have proportional control of the power dissipated in the probe in accordance with the position of power dissipation controls operable by the user and for automaticall...	03/19/1991
4970656	Analog drive for ultrasonic probe with tunable phase angle The system uses a tunable inductor in series with the piezoelectric crystal excitation transducer in the probe which has a flux modulation coil. The bias current through this flux modulation coil is controlled by the system. It is controlled such that the...	11/13/1990
4536722	Apparatus for rapidly switching a controlled signal source and method therefor In a controlled signal generator or specifically a microwave frequency signal generator, which requires a quieting capacitor, improved switching speed without degrading noise performance is provided by switching out the quieting capacitor during frequency...	08/20/1985
4513255	Phase locked crystal oscillator implemented with digital logic elements A quartz crystal oscillator is controlled entirely by digital elements to phase lock with a reference square wavetrain by alternately switching the tuning circuit of the oscillator between first and second configurations. The ratio of the times during whi...	04/23/1985
4325032	PRF Stabilized surface acoustic wave oscillator Mode locked surface acoustic wave oscillators, configured as comb spectrum generators, are stabilized by means of a variable phase in the closed, oscillation loop, the phase being controlled in response to deviations of the low, pulse repetition frequency...	04/13/1982

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Class 331/36R - Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.)