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7612626 Programmable varactor for VCO gain compensation and phase noise reduction  
A programmable varactor apparatus may include multiple binary weighted varactors controlled by multiple digital varactor bits. A programmable varactor apparatus may include a plurality of binary...
7612625 Bang-bang architecture  
In one embodiment, the present invention includes an apparatus having a voltage controlled oscillator (VCO) to generate a first clock signal having a frequency controlled by a bias current coupling...
7609123 Direct modulation type voltage-controlled oscillator using MOS varicap  
Transistors M 11 and M 12 are cross-coupled to each other so as to form a negative resistance circuit. First and second variable capacitor sections 10 and 20 are connected in parallel with an...
7609121 Multiple 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...
7609120 Voltage-controlled oscillator using LC resonator  
Provided is a voltage-controlled oscillator (VCO) using an LC resonator circuit which includes a first resonance circuit in which two serially connected varactor diodes and an inductor are...
7605667 Frequency synthesizer with a harmonic locked phase/frequency detector  
A frequency synthesizer. The frequency synthesizer comprises a harmonic locked phase/frequency detector, a low pass filter, a voltage controlled oscillator, and a frequency divider. The harmonic...
7602259 Voltage-controlled oscillator  
A voltage-controlled oscillator has an oscillation frequency controlled through a voltage applied across ends of a variable-capacitance element. The voltage-controlled oscillator has a frequency...
7595700 LC quadrature oscillator having phase and amplitude mismatch compensator  
Embodiments of the invention may provide for an LC quadrature oscillator that includes two LC oscillators that are cross-coupled with each other to generate I/Q clock signals and a phase and...
7589598 Dual-band voltage controlled oscillator  
The present invention discloses a dual-band voltage controlled oscillator (VCO), comprising a plurality of resonant circuits; an inductor module; a plurality of switches of current source; a buffer...
7583156 Oscillator with multi-tap inductor, capacitors, and negative-Gm stages  
System and method for increasing the frequency tuning range of a RF/microwave LC oscillator. An electronic communications device includes a controller to regulate the operation of the electronic...
7573347 Digitally controlled oscillator device and method for generating an oscillating signal with a digitally controlled phase locked loop  
A digitally controlled oscillator device includes a programming input, a selection input and an oscillator core with a first capacitive element which is frequency determining and programmable. The...
7573343 RTD-HBT differential oscillator topology  
The new RTD-HBT differential oscillator circuit topology is proposed. At the nodes of the inductors and varactors in the conventional differential oscillator topology, each the RTD is attached to...
7573342 VCO pre-compensation  
A VCO device is described that has pre-compensation. Digitally switchable compensation capacitors are selectively activated to adjust operation of the VCO to mitigate undesirable operational...
7567139 Voltage 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...
7564319 Vertical LC tank device  
An LC tack structure. The structure, including a set of wiring levels on top of a semiconductor substrate, the wiring levels stacked on top of each other from a lowest wiring level nearest the...
7564318 Switch 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...
7557669 Voltage 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....
7557668 Injection-locked frequency divider  
An injection-locked frequency divider is provided. The injection-locked frequency divider includes a variable reactance unit, a signal injection unit, a first switch, a second switch, a first...
7554416 Multi-band LC resonance voltage-controlled oscillator with adjustable negative resistance cell  
Provided is an LC resonance voltage-controlled oscillator (VCO) used for a multi-band multi-mode wireless transceiver. In order to generate a multi-band frequency, a capacitor bank and a switchable...
7545231 Transconductance and current modulation for resonant frequency control and selection  
In various embodiments, the invention provides a frequency controller and a temperature compensator for frequency control and selection in a clock generator and/or a timing and frequency reference....
7545230 Back-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...
7545227 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...
7541897 Dielectric resonator, voltage-controlled oscillator, and wireless apparatus  
A dielectric resonator having a line pattern that includes an electrode gap that defines a signal input/output portion provided on an open side, and a ground portion provided on a short-circuited...
7538630 Voltage 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...
7535308 Voltage-controlled oscillator decreasing phase noise  
A voltage-controlled oscillator includes an LC bank, a negative resistor circuit, a DC block, an AC block including a source resistor, and a first bias circuit controlled by a junction node of a...
7532079 Digital tuning of crystal oscillators  
Embodiments feature techniques and systems for digitally tuning a crystal oscillator circuit. In one aspect, embodiments feature a method for making a digitally tuned crystal oscillator circuit....
7528667 T-network capbank  
A capacitor bank adapted to provide a variable capacitance to an electronic circuit is provided. The capacitor bank has at least a most significant bit and a least significant bit and includes a...
7525392 XtalClkChip: trimming-free crystal-free precision reference clock oscillator IC chip  
A XtalClkChip based on the application of hierarchical circuit and noise circuit design on the RF circuits of LC oscillation tank and the multi-phase fractional PLL are developed. The XtalClkChip...
7518458 Oscillator and data processing equipment using the same and voltage control oscillator and data processing equipment using voltage control oscillator  
An LC resonant circuit of an oscillator includes a parallel circuit of an inductor, a first fine adjustable capacitor and a first capacitor bank, and a series circuit of a second fine adjustable...
7511589 DFY of XtalClkChip: design for yield of trimming-free crystal-free precision reference clock osillator IC chip  
A Design For Yield (DFY) of Crystal Chip (XTALCHIP (Trademark for a chip equivalent to a crystal resonator)) is to have the high yield of high quality high accurate clock chip to be able to...
7511582 Voltage controlled oscillator for use in phase locked loop  
The present invention provides a clock circuit to produce a Reference Clock Signal used to latch data between first bit stream(s) and second bit stream(s), wherein the number and bit rate of the...
7508279 Resonance circuit with variable diodes  
A resistance having a high impedance is connected between anode terminals of two variable capacitance diodes sharing a cathode, and the components described above are sealed in one package. The...
7504899 Inductor and capacitor-based clock generator and timing/frequency reference  
In various embodiments, the invention provides a clock generator and/or a timing and frequency reference comprising an LC oscillator with a frequency controller to control and provide a stable...
7498894 Varactor system having real or apparent low capacitance density  
A system in one embodiment includes a voltage controlled oscillator; at least two varactors coupled to a tank node, each of the varactors being of a different physical size, the tank node being...
7492231 Oscillator starting control circuit  
An oscillator starting control circuit capable of shortening a starting time and stably controlling the starting time, and furthermore, stabilizing an oscillating frequency after starting an...
7486153 Circuit and method for controlling an oscillation loop  
The circuit for controlling the oscillation frequency of an oscillation loop ( 66 ) has among others the following components—a first tunable capacitor unit ( 80 ) for providing a selectable...
7486152 Voltage controlled oscillator  
The cathode of a first varactor diode (VD 1 ) is connected to a resonator element (XD) of an oscillator ( 2 ) via a capacitor (C 1 ) and is connected to a triangular wave generator circuit ( 3 )...
7482887 Multi-band tunable resonant circuit  
A fully integrated, programmable mixed-signal radio transceiver comprising a radio frequency integrated circuit (RFIC) which is frequency and protocol agnostic with digital inputs and outputs, the...
7479839 Varactor 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...
7477113 Voltage-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...
7477111 Digitally controlled oscillator  
A plurality of variable load capacitance circuits is connected to each node between adjacent delay circuits of a ring oscillator, and changes load capacitance according to an external control...
7474167 Capacitance 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...
7474166 PLL frequency synthesizer circuit and frequency tuning method thereof  
A PLL frequency synthesizer circuit includes a voltage-controlled oscillator circuit provided with a capacitor, an inductor, and a variable capacitor element oscillating using the resonance...
7474159 Frequency calibration for frequency synthesizers  
A calibration circuit ( 17 ) for calibrating a frequency synthesizer ( 10 ) having a voltage-controlled oscillator (VCO) ( 15 ) with a plurality of switched-capacitor arrays (CA 1 -CAn). The...
7471164 Oscillator and method for operating an oscillator  
An oscillator is provided having an oscillator circuit including at least one oscillator circuit inductor and a first oscillator circuit capacitor, whereby the value of the first oscillator circuit...
7471160 Real-time frequency band selection circuit for use with a voltage controlled oscillator  
An integrated circuit including a phase-locked loop (PLL) circuit responsive to a voltage controlled oscillator (VCO) frequency band selection circuit that provides automatic frequency band...
7463107 Resonant circuit and oscillator having a resonant circuit  
The invention is directed to a resonant circuit having a frequency-determining element which has at least one switchable frequency-changing element connected in parallel therewith. The...
7463097 Systems involving temperature compensation of voltage controlled oscillators  
Systems involving temperature compensation of voltage controlled oscillators are provided. In this regard, a representative system incorporates: a voltage controlled oscillator (VCO) having a...
7456699 Frequency controller for a monolithic clock generator and timing/frequency reference  
In various embodiments, the invention provides a frequency controller to control and provide a stable resonant frequency of a clock generator and/or a timing and frequency reference. Such stability...
7456697 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...
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