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Class 331/177V - With voltage sensitive capacitor


Subclass of Class 331 - Oscillators
No. of patents: 836
Last issue date: 03/27/2012


1                      
NumberTitleIssue Date
8143962Tuning circuit with a wide tuning range
Tuning circuits with a wide tuning range and a method of tuning an integrated circuit (IC) are disclosed. An embodiment of the disclosed circuits includes varactor banks coupled in series. Each of the varactor banks may include multiple variable capacitors coupled i...
03/27/2012
8134418Varactor circuit and voltage-controlled oscillation
A varactor circuit and voltage-controlled oscillation are described. The varactor circuit includes a first varactor, a second varactor, a third varactor, and a fourth varactor. A first source-drain node of the first varactor and a second source-drain node of the sec...
03/13/2012
8130051Method and system for varactor linearization
Aspects of a method and system for varactor linearization are provided. In this regard, a relationship between control voltage and capacitance of a variable capacitor may be controlled utilizing a plurality of bias voltages communicatively coupled to a corresponding...
03/06/2012
8125285Digitally controlled oscillators
The problems of large oscillator signal frequency change per bit, small runtime tuning bandwidth, and large wiring layout (and therefore large integrated circuit (IC) layout) in digitally-controlled oscillators are addressed by using an array of addressable tuning u...
02/28/2012
8120440Voltage controlled oscillator (VCO) with simultaneous switching of frequency band, oscillation core and varactor size
The invention relates to a voltage controlled oscillator for generating a variable frequency. The oscillator comprises an oscillator core and a transconductive portion for compensating current losses in the oscillator core. The oscillator core comprises an inductive...
02/21/2012
8106719Voltage-controlled oscillator, phase-locked loop circuit and clock data recovery circuit
A voltage-controlled oscillator is provided with inductor 7a arranged between a power supply and a ground; and a variable capacitive section 56 that configures a resonator circuit with inductor 7a. Variable capacitive section 56 is provid...
01/31/2012
8098109Differential varactor circuit for a voltage controlled oscillator
According to one exemplary embodiment, a differential varactor circuit for a voltage controlled oscillator having two differential outputs includes a first varactor having first and second terminals and a second varactor having first and second terminals. In the dif...
01/17/2012
8098110Phase locked loop apparatus with selectable capacitance device
A phase locked loop apparatus includes an oscillator, a variable capacitance device, a selectable capacitance device, and a capacitance controller that is configured to provide a control signal to the selectable capacitance device. The selectable capacitance device ...
01/17/2012
8098108Microwave oscillator using integrated circuit technology
The invention relates to a millimeter frequency oscillator using integrated circuit technology. The oscillator includes a microwave output (Sf) providing an oscillation frequency Fout as a function of a control signal Vt. The oscillation frequency Fo...
01/17/2012
8093957Method and apparatus for frequency compensation for multi-band VCO
A method and apparatus for frequency compensation for multi-band VCO have been disclosed where a VCO tank loading capacitance is adjusted slowly to allow VCO operation in a linear range. ...
01/10/2012
8076986Switching capacitor generation circuit
A switching capacitor generation circuit which reduces the on-resistance and parasitic capacitance of a switch element and improves the operation properties of the switch element. The switching capacitor generation circuit, which has first and second output terminal...
12/13/2011
8067995Voltage controlled oscillator, and PLL circuit and wireless communication device each using the same
A voltage controlled oscillator includes first and second variable capacitance circuits 120 and 130, and first and second capacitance switch circuits 140 and 150. A control voltage Vt is fixedly applied to the first variable capacitance circuit 120, and control sign...
11/29/2011
8044741Systems and methods for reducing flicker noise in an oscillator
Various systems and methods for implementing dynamic logic are disclosed herein. For example, some embodiments of the present invention provide LC tank circuits having an inductance and a capacitance. In addition, the circuits include a flicker noise reducing switch...
10/25/2011
8040197Crystal oscillator
A crystal oscillator includes a crystal unit and a voltage-variable capacitive element that is connected to the crystal unit in series, the crystal oscillator varying an oscillation frequency by applying a control voltage between terminals of the voltage-variable ca...
10/18/2011
8031025Mixed-mode PLL
A mixed-mode PLL is disclosed. The mixed-mode PLL comprises a digital sigma-delta modulator, a low pass filter, and a digital controlled oscillator. The digital sigma-delta modulator receives a fractional bit signal. The low pass filter is coupled to the digital sig...
10/04/2011
7990227Phased-locked loop (PLL) synthesizer-synthesizer with improved voltage-controlled oscillator (VCO) pre-tuning
An apparatus for providing Phased-Locked Loop (PLL) synthesis comprises a phase detector, at least one switchable filter, an oscillator controlled by a control voltage (uPLL) and a divider. The controlled oscillator has two inputs, wherein the control vol...
08/02/2011
7893785Low-noise fine-frequency tuning
Circuits, methods, apparatus, and code that provide low-noise and high-resolution electronic circuit tuning. An exemplary embodiment of the present invention adjusts a capacitance value by pulse-width modulating a control voltage for a switch in series with a capaci...
02/22/2011
7872542Variable capacitance with delay lock loop
An integrated circuit includes a delay lock loop (DLL) circuit that generates incremental delay line signals and a delay line output signal based on a received clock signal. A pulse-width modulation (PWM) control module generates a PWM control signal. A tunable circ...
01/18/2011
7834712Techniques for providing option conductors to connect components in an oscillator circuit
An oscillator circuit includes transistors that are cross-coupled through routing conductors in a first conductive layer. The oscillator circuit also includes a varactor, a capacitor, and an option conductor in a second conductive layer. The option conductor forms a...
11/16/2010
7800458Wide-band voltage controlled oscillator
A wide-band voltage controlled oscillator includes a cross-connected transistors for providing a stable oscillating signal, an inductor unit for providing an inductance for determining a resonance frequency, a varactor bank including a plurality of switchable variab...
09/21/2010
7795985Clock control for data synchronization in varactor arrays
Implementations of varactor systems compare current data with immediately prior data to determine whether there has been a change in the data, and enable a clock signal for data paths which have changed data. ...
09/14/2010
7782152Monotonic frequency tuning technique for DCXO in cellular applications
A frequency tuning device for use in a crystal oscillator circuit includes a first fine tuning array of capacitors, a second fine tuning array of capacitors and a coarse tuning array of capacitors coupled in parallel to produce a tuning capacitance for tuning the cr...
08/24/2010
7782151VCO digital range selection
An extended range voltage controller oscillator (VCO) circuit for use in a phase-locked loop (PLL) circuit is provided. The VCO circuit includes two additional pairs of varactors which are used to extend the range of the VCO circuit around its center frequency. ...
08/24/2010
7746185Apparatus and method for acquisition and tracking bank cooperation in a digitally controlled oscillator
A novel apparatus for and method of acquisition and tracking bank cooperation in a digitally controlled oscillator (DCO) within an all digital phase locked loop (ADPLL). The acquisition bits of the acquisition bank are used as an extension of the modulation range. T...
06/29/2010
7719375Automatically calibrating frequency features of a phase locked loop
A PLL includes an open-loop automatic frequency calibration circuit. The open-loop automatic frequency calibration circuit includes a frequency detector, first and second sinks, a comparator and a bank selector. The frequency detector generates an up-signal and a do...
05/18/2010
7688155Variable capacitor circuit having linear capacitance variation and voltage controlled oscillator using the same
Provided is an apparatus having a variable capacitor circuit which is capable of obtaining a constant gain with respect to a whole control voltage by using a linear variable frequency characteristic for a variation of the control voltages, to thereby attain a wide v...
03/30/2010
7675378Multiple status e-fuse based non-volatile voltage control oscillator configured for process variation compensation, an associated method and an associated design structure
Disclosed are embodiments of a voltage controlled oscillator (VCO) capable of non-volatile self-correction to compensate for process variations and to ensure that the center frequency of the oscillator is maintained within a predetermined frequency range. This VCO i...
03/09/2010
7675377Voltage controlled oscillator
The present invention provides a voltage controlled oscillator having a wide frequency variation range and an oscillation frequency that shows favorable linearity with respect to control voltage. The present invention includes an amplifier circuit 21, a piezo...
03/09/2010
7675376Voltage-controlled oscillator
A voltage-controlled oscillator has a tuned circuit for controlling the oscillation frequency. The tuned circuit has a variable-capacitance element whose capacitance varies in response to a control voltage and a negative capacitance circuit whose impedance frequency...
03/09/2010
7646257Method and apparatus to facilitate the provision and use of a plurality of varactors with a plurality of switches
A plurality of varactors are coupled via a first electrode to a shared terminal that in turn can operably couple to a source of control voltage. A second electrode for each varactor couples to a corresponding switch, where each switch couples to at least two differe...
01/12/2010
7609121Multiple status e-fuse based non-volatile voltage control oscillator configured for process variation compensation, an associated method and an associated design structure
Disclosed are embodiments of a voltage controlled oscillator (VCO) capable of non-volatile self-correction to compensate for process variations and to ensure that the center frequency of the oscillator is maintained within a predetermined frequency range. This VCO i...
10/27/2009
7567139Voltage controlled oscillator, and PLL circuit and wireless communication apparatus using the same
A voltage controlled oscillator including an inductor circuit including inductors 101, 102, a variable capacitance circuit 110 having variable capacitance elements 111, 112 changing a capacitance according to a voltage difference between two ter...
07/28/2009
7564318Switch capacitance and varactor banks applied to voltage controlled oscillator having constant frequency tuning sensitivity
A variable capacitance applied to a voltage controlled oscillator includes a switch capacitance bank including a plurality of controllable capacitor paths for selectively connected between a first node and a second node in parallel; and, a switch variactor bank incl...
07/21/2009
7557669Voltage controlled oscillator and its control method
An object of the present invention is to provide a voltage controlled oscillator in a microwave band without narrowing the variable frequency range and having improved phase noise characteristics. This invention is a voltage controlled oscillator in the microwave ba...
07/07/2009
7545230Back-gate coupling voltage control oscillator
A voltage control oscillator (VCO) includes a VCO circuit and a back-gate coupling circuit, wherein the VCO circuit includes at least a first transistor, a second transistor and a resonant cavity formed by an inductor and a capacitor. The back-gate coupling circuit ...
06/09/2009
7538630Voltage controlled oscillator
The present invention is an oscillator including: a first resonance circuit including a first variable capacitance diode having a cathode connected to a control terminal, a first capacitor and a first inductor connected between an anode of the first variable capacit...
05/26/2009
7486152Voltage controlled oscillator
The cathode of a first varactor diode (VD1) is connected to a resonator element (XD) of an oscillator (2) via a capacitor (C1) and is connected to a triangular wave generator circuit (3) via an inductor (RFC1) and a resistor elemen...
02/03/2009
7479839Varactor bank switching based on negative control voltage generation
A method and apparatus for varactor bank switching for a voltage controlled oscillator is disclosed. Varactor bank switching involves generating a negative bias voltage signal as a control signal for a varactor bank switch in an off-state, the varactor bank switch c...
01/20/2009
7477113Voltage-controlled capacitance linearization circuit
A linear voltage-controlled capacitance circuit is provided that includes a plurality of differentially coupled metal-oxide-semiconductor (MOS) varactor pairs. Each MOS varactor pair is operable to receive a same tuning voltage and to receive a bias voltage unique t...
01/13/2009
7474167Capacitance switch circuitry for digitally controlled oscillators
Variable capacitance circuitry includes a fine tuning bank and a medium tuning bank. The fine tuning bank includes a plurality of varactors of progressively increasing size (e.g., width). Only one of these varactors is turned on at any one time. The medium tuning ba...
01/06/2009
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