Matches 1 - 50 out of 661 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >
Match Document Document Title
7626464 Multi-frequency signal source  
A multi-frequency signal source and a method for providing a multi-frequency signal source with phase-lock capability are provided. The multi-frequency signal source includes a plurality of...
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...
7612624 Resistor-capacitor oscillation circuit capable of adjusting oscillation frequency and method of the same  
An RC oscillation circuit and method capable of adjusting an oscillation frequency includes: an RC oscillator including a variable resistor and a variable capacitor, the RC oscillator generating an...
7609122 Method and system for calibration of a tank circuit in a phase lock loop  
A phase lock loop (PLL) includes a calibration loop for calibrating a tank circuit for capacitance variation through process variations of manufacturing an integrated circuit including the PLL. A...
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...
7605661 Phase locked loop circuit including digital voltage-controlled oscillator, ring oscillator and selector  
A PLL circuit includes a polyphase reference clock output circuit, which outputs multiple reference clocks, each clock being of different phase. The PLL circuit further includes a digital voltage...
7603095 Apparatus and method of switching intervals  
The present invention provides a way of hysteretic switching for efficiently reducing the heavy switching between two adjacent coarse intervals. The present invention disposes a number of fine...
7598817 Oscillator for outputting different oscillation frequencies  
An oscillator includes: oscillation units ( 11 through 1 n) outputting oscillation signals of different frequencies; a transmission line ( 15 ) to which outputs of the oscillation units ( 11, 12...
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...
7589594 Variable loop bandwidth phase locked loop  
An apparatus comprising a voltage controlled oscillator, a first charge pump, a second charge pump, a switch circuit and a comparator circuit. The voltage controlled oscillator may be configured to...
7576622 Method of generating an output of a frequency synthesizer  
A method of generating an output of a frequency synthesizer is disclosed. The method comprises the steps of generating an output of the frequency synthesizer based upon frequency synthesizer values...
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...
7573339 Ring oscillator with ultra-wide frequency tuning range  
Methods and systems for tuning an oscillator are disclosed and may comprise dividing a desired frequency range of a delay-cell based ring oscillator into segments, and tuning the delay-cell based...
7567629 Multiphase clock recovery  
The invention represents a parallel and distributed approach to clock recovery based on multiple mutually phase shifted sample clock signals (åS) defining a set of orthogonal clock phases. 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...
7548132 Monolithic clock generator and timing/frequency reference  
In various embodiments, the invention provides a clock generator and/or a timing and frequency reference, with multiple operating modes, such power conservation, clock, reference, and pulsed modes....
7548125 Frequency calibration for a monolithic clock generator and timing/frequency reference  
Exemplary embodiments of the invention provide a system, method and apparatus for frequency calibration of a free-running, reference harmonic oscillator. An exemplary system comprises the harmonic...
7548124 System and method for self calibrating voltage-controlled oscillator  
A system and a method for self calibrating a voltage-controlled oscillator (VCO). In the system, a mode controller generates a control signal for each of an automatic band selection mode, an...
7548120 Frequency switching method  
A frequency switching method is used to make switching among a plurality of frequency signal sources each providing a specific frequency range covering multiple bands. The method includes steps of...
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....
7538624 Oscillator having multiple oscillation units  
The present invention is an oscillator including: first transistors outputting oscillation signals of different oscillation frequencies to collectors; a common node to which outputs of emitters of...
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....
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...
7511581 Wide-band multimode frequency synthesizer and variable frequency divider  
A wide-band multimode frequency synthesizer using a Phase Locked Loop (PLL) is provided. The multiband frequency synthesizer includes a multimode prescaler, a phase detector/a charge pump, a...
7504903 Communication semiconductor integrated circuit device and a wireless communication system  
In a communication semiconductor integrated circuit device, an oscillator of a PLL circuit can operate in a plurality of frequency bands. With a control voltage (Vc) of the oscillator fixed to a...
7504900 Integrated circuit package including programmable oscillators  
An integrated circuit package includes a processing core and an internal oscillator. The processing core operates on a set of instructions to carry out predefined processes. The internal oscillator...
7501900 Phase-locked loop bandwidth calibration  
A novel circuit for obtaining the bandwidth of a phase-locked loop circuit is disclosed. The circuit adjusts a phase of a signal (reference or generated), causing the phase-locked loop circuit to...
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...
7498892 Split-biased interpolated voltage-controlled oscillator and phase locked loop  
A voltage-controlled oscillator (VCO) of ring-connected stages, where each stage in the VCO has a first set of differential inverters biased by variable bias voltages, and a second set of...
7498888 Method and arrangement for interference compensation in a voltage-controlled frequency generator  
The invention, which relates to a method and an arrangement for interference compensation in a phase-locked loop comprising a voltage-controlled frequency generator, wherein the frequency generator...
7492228 Voltage controlled oscillator having improved phase noise  
An apparatus for compensating for variations in loop gain of a phase locked loop as a function of frequency, comprising a correction calculator for introducing a loop gain correction as a function...
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...
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...
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...
7449964 System and method for tuning output drivers using voltage controlled oscillator capacitor settings  
The present invention provides a method for tuning output drivers to an operating frequency based on settings used to tune other devices within the device such as a VCO. First the VCO within a PLL...
7443259 Fast VCO band selection by frequency to voltage converter  
The invention comprises a phase locked loop that has an input adapted to receive a reference frequency. A phase detector is connected directly to the input, a charge pump is connected directly to...
7443252 Calibration circuit and operation method for voltage-controlled oscillator  
A calibration circuit for voltage-controlled oscillator (VCO) includes a calibration bias generator, a VCO, a detection unit, a micro control unit, an adjuster unit, a phase-locked loop (PLL) unit,...
7423495 Oscillator and method for generating an oscillator signal  
An oscillator includes a first resonator circuit, a second resonator circuit coupled to the first resonator circuit and a reconfigurable network having a transconductance and coupled to at least...
7423493 Wireless communication semiconductor integrated circuit device and mobile communication system  
An RF IC in which a PLL circuit including a loop filter is incorporated into a semiconductor chip is achieved without increasing power consumption or chip size. The RF IC includes a VCO capable of...
7417511 Modulation circuit with integrated microelectro-mechanical system (MEMS) components  
A modulation circuit includes a microelectronic electromechanical system (MEMS) based resonant structure having a resonant frequency, an excitation input and an output. A control module is coupled...
7414490 Dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing  
Disclosed is a dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing. The dual-band voltage-controlled oscillator includes a power supply unit for supplying a...
7411464 Systems and methods for mitigating phase jitter in a periodic signal  
An oscillator circuit can generate a periodic signal, and a frequency adjustment circuit can adjust the frequency of the periodic signal. The periodic signal may include phase jitter. In one aspect...
7411462 Built-in self test method for a digitally controlled crystal oscillator  
A novel testing mechanism operative to test large capacitor arrays such as those used in a digitally controlled crystal oscillator (DCXO). The invention is adapted for use in DCXO circuits that...
7408415 Voltage controlled oscillator phase locked loop circuit with loop filter capacitance tuning  
A phase locked loop circuit comprises a voltage controlled oscillator with a control input to which a variable control voltage is applied and a phase-frequency discriminator with an output...
7405633 Methods and apparatus for loop bandwidth control for a phase-locked loop  
A method for controlling loop bandwidth of a phase locked loop is described. The method includes setting the loop bandwidth to a value, calculating at least one of a phase error and a frequency...
7405632 Voltage-controlled oscillator, transmitter, and receiver  
A voltage-controlled oscillator includes (i) a first variable-capacity element, (ii) a resonance circuit whose resonance frequency changes in accordance with a control voltage applied to the first...
Matches 1 - 50 out of 661 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >