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8169271 Interference resistant local oscillator  
With some embodiments, a VCO (voltage controlled oscillator) operates at an integer multiple (N) above a desired transmission frequency. In accordance with one embodiment, a chip is provided with a...
8164401 Tunable artificial dielectrics  
Tuning devices and methods are disclosed. One of the devices comprises a metal structure connected with artificial dielectric elements, and variable capacitance devices. Each variable capacitance...
8154350 PLL with continuous and bang-bang feedback controls  
An apparatus is provided. The apparatus comprising a voltage controlled oscillator (VCO), an amplifier, a switch, a calibration capacitor, and a control loop. The VCO includes a capacitive network...
8154351 Voltage-controlled oscillator and gain calibration technique for two-point modulation in a phase-locked loop  
A VCO in a phase-locked loop (PLL) is arranged to receive low-pass data via a first input and high-pass data at a second input. The first input is coupled to a first set of varactors in the VCO....
8143962 Tuning 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...
8134417 Automatic amplitude control for voltage controlled oscillator  
A circuit and method for calibrating a VCO (voltage controlled oscillator) is disclosed. In one embodiment, a circuit includes a VCO and a bias control circuit coupled to a tail node of the VCO. An...
8134421 Voltage control oscillator and quadrature modulator  
A voltage control oscillator includes: first and second field effect transistors, a drain of one of which is connected to a gate of the other and a drain of the other of which is connected to a...
8134418 Varactor 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...
8134413 Low-power oscillator  
Techniques for synthesizing a signal having a desired frequency from an oscillation signal. In an aspect, a reference signal having a known frequency may be periodically used to determine a ratio...
8130048 Local oscillator  
Equal numbers of variable capacitance elements, capacitance values of which are separately controlled according to a logic value of a corresponding bit of a delay control signal that is in a...
8130051 Method 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...
8125285 Digitally 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...
8120440 Voltage 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...
8115558 Digital PLL circuit and semiconductor integrated circuit  
A digital PLL circuit includes: an oscillation circuit, wherein an oscillation frequency is controlled by changing the number of capacitance elements to be connected in parallel to an inductance...
8115560 Ring-shaped voltage control oscillator  
In one embodiment, a circuit topology for use in an n-phase voltage controlled oscillator (VCO) or injection-locked frequency divider includes a transmission line ring having n transmission line...
8111110 Low-noise voltage controlled oscillator  
A low-noise voltage controlled oscillator is provided, to improve a phase noise characteristic and widen a frequency variable range. The low-noise voltage controlled oscillator is configured so...
8106719 Voltage-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....
8098108 Microwave 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...
8098110 Phase 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...
8098109 Differential 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...
8093957 Method 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.
8081035 Electronic pulse generator and oscillator  
A multiphase oscillator with a control path for urging the rotational direction of the oscillator is disclosed. The multiphase oscillator has an electrically or magnetically or both continuous...
8081038 Ring oscillator having wide frequency range  
Provided is a ring oscillator having an extended range of oscillation frequency by varactors coupled to delay cells even in a simple structure. The wide frequency range results from simply varying...
8076986 Switching 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...
8076985 PLL/FLL with voltage controlled oscillator  
Provided is a voltage-controlled oscillator that can hold an oscillation frequency at a desired value when an oscillation frequency changes due to the temperature, without narrowing a variable...
8072282 Method of compensating an oscillation frequency and PLL  
A method for compensating an oscillation frequency, a device, and a phase locked loop (PLL) is applied in the LC oscillating loop, including: sending voltage control signals to one end of a...
8067858 Low-distortion voltage variable capacitor assemblies  
An embodiment of the present invention provides an apparatus, comprising a first half cell comprising a circuit with two or more voltage variable capacitors (VVCs) configured in anti-series in...
8067995 Voltage 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...
8044733 Stress tolerant differential colpitts voltage controlled oscillators  
Some of the embodiments of the present disclosure provide an apparatus comprising a voltage controlled oscillator (VCO) having a first transistor, a first resistor operatively coupled between a...
8045950 Mixer circuit, receiving circuit, transmitting circuit, and method for operating a mixer circuit  
A mixing circuit is provided that includes a charge circuit, an oscillating circuit inlet step which is connected to a circuit which feeds an oscillating signal, and a signal inlet step. The...
8044741 Systems 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...
8040197 Crystal 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...
8035456 Multi-phase signal generator and voltage-controlled oscillator thereof  
A VCO comprising a cross-coupled transistors module and a resonant module is provided. The resonant module comprises a first transistor, second transistor, a first inductor and varactor string and...
8035452 Structure for transforming an input voltage to obtain linearity between input and output functions and system and method thereof  
A design structure is embodied in a machine readable medium for designing, manufacturing, or testing a design. The design structure includes a first structure for determining a non-linear...
8031011 Digitally controlled oscillators  
Oscillator circuitry is provided that is based on a ring of inverters. The ring of inverters may be single-ended or differential inverters. Digitally controlled adjustable load capacitors may be...
8031025 Mixed-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...
8031019 Integrated voltage-controlled oscillator circuits  
Techniques for providing voltage-controlled oscillator circuits having improved phase noise performance and lower power consumption. In an exemplary embodiment, a voltage controlled oscillator...
8031018 Oscillator with coupled amplifier  
An oscillator including a resonator with at least one first tuneable element, with which a resonant frequency of the resonator can be varied. The oscillator further includes an amplifier, which...
8022780 Auxiliary varactor for temperature compensation  
Techniques for compensating for the effects of temperature change on voltage controlled oscillator (VCO) frequency are disclosed. In an embodiment, an auxiliary varactor is coupled to an LC tank of...
8013682 Frequency synthesizer and method for controlling same  
A frequency synthesizer includes compensation variable capacitance diodes 53 and 54 in a voltage-controlled oscillator 5 in addition to a variable capacitance diode 52 whose DC bias voltage is...
7999622 Adaptive phase noise cancellation for fractional-N phase locked loop  
An embodiment of the invention is a circuit for adaptive phase noise cancellation for a fractional-N PLL. A preferred embodiment employs a split loop filter architecture. Two loop filter halves...
7990227 Phased-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...
7990226 Non-linear crystal oscillator capacitive load circuits  
A load circuit for a crystal oscillator includes a plurality of capacitors and a load control circuit configured to selectively add the capacitors to a load at a terminal of the crystal oscillator...
7986194 Oscillator  
An oscillator, includes an amplifier circuit including a semiconductor element having a first constant potential as reference potential for a power supply voltage, a variable capacitance element, a...
7982551 Voltage controlled oscillator having temperature detecting circuit  
A VCO circuit includes a temperature detector circuit, a voltage generator circuit, a switch, a resonance circuit and an oscillator. The temperature detector detects a temperature, and the voltage...
7978015 Oscillator with reduced phase noise characteristics  
One well known problem associated with voltage controlled oscillators or VCOs is phase noise, and it is desirable to reduce phase noise in order to improve VCO performance. Here, a VCO is provided...
7973609 Digitally-controlled oscillator, frequency synthesizer and radio communication device  
A frequency synthesizer includes a digitally-controlled oscillator and an oscillation frequency control unit. The digitally-controlled oscillator includes a loop-shaped transmission line path...
7961056 Low phase noise voltage controlled oscillator  
Embodiments of the present invention include a low phase noise oscillator circuit using a current-reuse technique to reduce power consumption and improve phase noise, where the oscillator circuit...
7956698 High-frequency voltage-controlled oscillation circuit  
A high-frequency voltage-Controlled oscillation circuit which does not oscillate abnormally, is improved in phase noise, and has a small circuit scale. A phase shift circuit composed of third or...
7956695 High-frequency low-gain ring VCO for clock-data recovery in high-speed serial interface of a programmable logic device  
A voltage-controlled oscillator operates at high frequency without high gain by dividing the frequency range into a plurality of subranges, which preferably are substantially equal in size. Within...
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