Matches 301 - 350 out of 1786 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
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6943600 Delay-compensated fractional-N frequency synthesizer  
A Phase-Locked Loop is provided that includes a main loop, a calibration loop, and Control Logic. The main loop comprises, coupled in series, a Phase Frequency Detector, a Main Charge Pump, a Main...
6937105 Frequency locked loop with improved stability using binary rate multiplier circuits  
The invention provides a frequency locked loop and related method that enables the conversion of a signal frequency with improved stability. A frequency locked loop embodying the invention includes...
6930560 High-speed and high-precision phase locked loop  
A phase lock loop includes a charge pump, a voltage controlled oscillator (VCO), and a phase frequency detector. The phase frequency detector has a dynamic logic structure. The phase frequency...
6930558 Pulse-width to voltage converter  
Apparatus for deriving an analog signal from a pulse-width modulated signal, for use in a closed-loop control system such as a phase-locked loop, is arranged to provide non-linear conversion such...
6927635 Lock detectors having a narrow sensitivity range  
Lock detectors are provided that have a narrow sensitivity range.
6927637 Efficient tuning circuit for on-chip voltage controlled oscillator and method  
An exemplary tuning circuit is coupled to, a voltage controlled oscillator. The tuning circuit comprises a lock detect monitoring circuit, a VTUNE monitoring circuit and an autotuner circuit. The...
6927638 PLL with multiple tuning loops  
Some embodiments provide a charge pump to output a first control signal and a second control signal based on a frequency of an oscillating signal and a reference frequency, a switch capacitor...
6924706 Phase locked loop  
A phase locked loop has a voltage controlled oscillator with two tuning inputs. One tuning input can be supplied with a feedback signal via a frequency divider in a conventional phase locked loop....
6922110 Phase locked loop (PLL) frequency synthesizer and method  
A phase locked loop (PLL) frequency synthesizer generates a high frequency signal by generating an output signal from a voltage controlled oscillator of a primary phase locked loop (PLL) circuit....
6919769 Method and apparatus for fast lock acquisition in self-biased phase locked loops  
A self-biased phase locked loop (PLL) circuit includes a charge pump to generate a control voltage, a controlled oscillator coupled to the charge pump to generate the output signal based at least...
6919759 Digitally controlled tuner circuit  
A digitally controlled tuner circuit for continuous time filters. The digital PLL-based tuner circuit has a digitally controlled oscillator and an open-loop filter. The oscillator has digitally...
6914489 Voltage-controlled oscillator presetting circuit  
A circuit comprises a frequency synthesizing circuit with a voltage-controlled oscillator whose frequency is preset to a preset value. The voltage-controlled oscillator generates an oscillating...
6914491 Controlling an oscillator or a phase-delay device in a phase-control circuit  
In a phase control loop, an output signal which is used to control an oscillator in a PLL or a phase-delay device in a DLL is generated by means of a phase/frequency detector. In accordance with...
6911868 Phase-locked loop frequency synthesizer using automatic loop control and method of operation  
In a phase-locked loop (PLL) frequency synthesizer, a first frequency divider divides an output signal from a voltage-controlled oscillator by a first divider value. A second frequency divider...
6909329 Adaptive loop bandwidth circuit for a PLL  
A phase-locked loop (PLL) employs a phase detector (PD) generating an up/down signal based on the phase error between a data signal and a clock signal input to the phase detector. The PD senses...
6900675 All digital PLL trimming circuit  
In one set of embodiments, the invention comprises a system and method for automatically trimming the center frequency of a VCO in a PLL. The trimming may be performed by a digitally controlled...
6897733 Low offset and low glitch energy charge pump for PLL-based timing recovery systems  
A high precision charge pump used in a phase-lock-loop incorporating a phase/frequency detector is designed and constructed to substantially eliminate the effects of DC offset and glitch errors on...
6894570 Fast frequency locking method and architecture realized by employing adaptive asymmetric charge-pump current mechanism  
The present invention is related to a fast frequency locking method and architecture realized by employing adaptive asymmetric charge-pump current mechanism, whose circuit is composed of elements...
6895063 Frequency changer and digital tuner  
A zero or near zero IF frequency changer for use in a digital tuner comprises multipliers which receive the RF input signal from an input. The multipliers receive quadrature local oscillator...
6894569 High-performance charge pump for self-biased phase-locked loop  
A charge pump includes a charge circuit switch, a pump circuit switch, and a controller for generating a first control signal for switching the charge circuit switch and a second control signal for...
6894571 Phase locked loop circuit with selectable variable frequency dividers  
A PLL circuit comprises a reference signal generating unit for generating reference signals of different phases, variable frequency dividers for dividing the frequency of the output signal of a...
6891412 Low noise filter  
An RC equivalent filter is provided in which the resistor is replaced by a voltage source ( 40 ) and a capacative divider. With suitable control the voltage occurring across a capacitor ( 44 ) in...
6888413 Frequency synthesizer using a VCO having a controllable operating point, and calibration and tuning thereof  
A frequency synthesizer, a calibrator thereof, and an operating controller thereof are described. The synthesizer comprises a main charge pump that drives a voltage controlled oscillator (VCO)...
6885873 Adaptively extending tunable range of frequency in a closed loop  
A semiconductor device or a circuit includes a controllable oscillator and circuitry that senses a voltage which may control the controllable oscillator and digitally controls a gain compensation,...
6882230 System and method for control parameter re-centering in a controlled phase lock loop system  
A re-centering system ( 116 ) for re-centering the control parameter of a phase lock loop (PLL) ( 112 ). The re-centering system includes sources ( 140 ) for obtaining/storing operating parameters,...
6879218 Frequency modulation corrector keeping a good oscillating signal quality and suppressing dependability of a modulation degree  
A correction circuit for a voltage-controlled oscillator (VCO) is arranged outwardly of the voltage-controlled oscillator. The oscillation of the selected frequency and the frequency modulation are...
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...
6870411 Phase synchronizing circuit  
An object of this invention is to provide a phase synchronizing circuit capable of automatically adjusting a VCO such that the VCO satisfies a predetermined frequency range even in a frequency...
6867655 Fast-acquisition phase-locked loop  
The invention provides techniques for compensating for current leakage from a loop filter during off times of a PLL between on times of the PLL, e.g., when a cell phone is in paging mode. The...
6864753 Stabilization technique for phase-locked frequency synthesizers  
A stabilization technique that relaxes the tradeoff between the settling speed and the magnitude of output sidebands in phase-locked frequency synthesizers. The method introduces a zero in the...
6859106 PLL circuit and phase difference detecting circuit that can reduce phase pull-in time and adjust a skew at a higher precision  
A PLL circuit for comparing with a phase comparator 1 a phase between an input signal and one of multiphase pulse signals CK 0 DIV to CKNDIV used as a channel clock generated by an output of a...
6859108 Current biased phase locked loop  
A phase locked loop (PLL) circuit adjusts a voltage controlled differential oscillator to generate an output frequency signal that is a selected multiple of an input reference signal. An oscillator...
6856204 Phase locked loop circuit having wide locked range and semiconductor integrated circuit device having the same  
Provided are a phase locked loop (PLL) circuit having a wide locked range and a semiconductor integrated circuit (IC) device having the PLL circuit. The provided PLL circuit includes a...
6856205 VCO with automatic calibration  
Voltage-controlled oscillator with apparatus for automatic calibration. The voltage-controlled oscillator includes switches connecting associated coarse-tuning capacitors to an LC resonant tank of...
6853257 PLL circuit including a voltage controlled oscillator and a method for controlling a voltage controlled oscillator  
A voltage controlled oscillator having a wide oscillation frequency band, desirable carrier-noise characteristic, and desirable linearity of the oscillation frequency relative to a control voltage....
6853256 Voltage controlled oscillator with reference current generator  
A first current controlled oscillator outputs an oscillation signal of a first frequency equal to a product of a first control current and a first gain. A first voltage/current converting circuit...
6853255 AFC circuit compensating an error in oscillation frequency  
An AFC circuit compensates for an error of the oscillation frequency of a detecting oscillator based on a detection signal from a detector circuit. The detector circuit generates the detection...
6853253 Load pump with an extremely wide output voltage  
The invention concerns a load pump device able to provide a constant current, respectively positive or negative, over an extremely wide output voltage range. A symmetrical switching system...
6850124 Circuit, architecture and method for tracking loop bandwidth in a frequency synthesizer having a wide frequency range  
Circuits, architectures, and methods for tracking a phase locked loop (PLL) configuration such that its VCO gain is essentially a linear function of its feedback divider factor over a wide...
6842079 High-speed, high PSRR, wide operating range voltage controlled oscillator  
A VCO for a PLL may include a ring oscillator having a power supply controlled in response to the VCO's control voltage input and an inverter having an input coupled to the ring oscillator's output...
6838946 Circuit and method for adjusting circuit tolerances  
A frequency response adjuster for a frequency responsive circuit, and a method for tuning a frequency response of a circuit, are disclosed. The adjuster may include a time constant sensor, wherein...
6836188 PLL circuit and method for eliminating self-jitter in a signal which is received by a control circuit  
PLL circuit for eliminating self-jitter in a signal which is received by a control circuit, having a phase comparison circuit for producing a phase difference signal, which indicates the phase...
6833766 Adaptive loop gain control circuit for voltage controlled oscillator  
There is provided an adaptive loop gain control circuit for a voltage-controlled oscillator (VCO). The adaptive loop gain control circuit for a voltage-controlled oscillator (VCO) includes a...
6833764 Apparatus and method for synthesizing a frequency using vernier dividers  
A PLL frequency synthesizer tunable in small step sizes that comprises: 1) a first PLL circuit comprising: i) a first feedforward frequency divider that receives an F(in) frequency and generates an...
6833767 Frequency synthesizer using digital pre-distortion and method  
A method includes identifying a setting for a capacitor bank associated with a voltage-controlled oscillator in a closed-loop phase-locked-loop. The setting represents a combination of one or more...
6834183 VCO gain tracking for modulation gain setting calibration  
Voltage controlled oscillator (VCO) gain tracking is used for programming modulation gain settings to minimize modulation distortion in a phase locked loop of a mobile station ( 10 ). A synthesizer...
6828864 Low-jitter loop filter for a phase-locked loop system  
A loop filter device and method for implementing a loop filter for a phase locked loop (“PLL”) circuit, which locks a frequency of a signal to a reference frequency, are disclosed. The loop...
6825728 Method and device for generating frequency adjustment parameters for a voltage controlled oscillator  
A method for generating parameters for adjusting the frequency of a VCO. A desired carrier frequency may be based off the output of the VCO. The method determines parameters that are operable to...
6825733 Low jitter integrated phase locked loop with broad tuning range  
System and method for providing a low noise signal having a broad tuning range (1 GHz to 10 GHz, or larger), with associated jitter no more than about 10 percent of the selected period of a target...
6825730 High-performance low-noise charge-pump for voltage controlled oscillator applications  
A charge-pump and a method are provided for conditioning the phase detector output in a phase-locked loop (PLL). The method comprises: accepting a pair of differential phase detector (PD) output...
Matches 301 - 350 out of 1786 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >