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7400205 Frequency synthesizer and oscillation control method of frequency synthesizer  
The present invention provides a frequency synthesizer capable of switching an oscillation frequency band while maintaining a lock state realized with a small-scale and low-current-consumption...
7400204 Linear phase detector and charge pump  
A phase detector detects a phase difference between a first and second signal received by a phase detector. A charge is supplied by a charge pump circuit that corresponds to the phase difference...
7394418 Apparatus comprising a sigma-delta modulator and method of generating a quantized signal-delta modulator  
A method of generating a quantized signal in a Sigma-Delta modulator ( 25 ) comprises the steps of feeding a modulator input signal to a quantizer ( 15 ) via at least one integrator ( 12, 13 );...
7394320 Phase-locked loop and method for operating a phase-locked-loop  
A phase-locked loop suitable for mobile radio communications and a method for operating the same is disclosed. One embodiment of the phase-locked loop comprises an oscillator, a counter, a...
7394319 Pulse width modulation circuit and multiphase clock generation circuit  
A pulse width modulation circuit comprises a multiphase clock generation section which generates multiphase clock signals based on a reference clock, and a pulse width modulation signal generation...
7385539 All-digital phase locked loop (ADPLL) system  
An all-digital phase locked loop system for generating an oscillator output signal under control of a digital reference input. The system comprises a digitally controlled oscillator, a digital loop...
7385451 Arrangement, phase locked loop and method for noise shaping in a phase-locked loop  
A noise shaping arrangement for a phase locked loop includes a first order sigma-delta modulator arranged to provide a first-order quantized output and a feedback path output. A second order...
7375592 System and method for maintaining an accurate frequency on a voltage controlled oscillator  
A method for phase-locking a voltage controlled oscillator is disclosed. The method comprises receiving, at a phase detector, a phase input signal and a phase feedback signal from the voltage...
7375591 Robust false locking prevention in referenceless frequency acquisition  
An output of an oscillator of a phase-locked loop is swept across a predetermined frequency range by varying control settings associated with the oscillator. A plurality of control settings that...
7372340 Precision frequency and phase synthesis with fewer voltage-controlled oscillator stages  
A clock synthesis circuit) including a phase-locked loop and one or more frequency synthesis circuits is disclosed. The phase-locked loop includes a voltage-controlled oscillator (VCO) having a...
7369000 Adaptive frequency detector of phase locked loop  
An adaptive frequency detector used in a phase locked loop for detecting a frequency difference between an input signal and an output clock generated from an oscillator of the phase locked loop...
7365607 Low-power, low-jitter, fractional-N all-digital phase-locked loop (PLL)  
A method for synthesizing frequencies with a low-jitter an all-digital fractional-N phase-locked loop (PLL) electronic circuit adapted to synthesize frequencies with low-jitter, wherein the...
7358820 Method and device for stabilizing a transfer function of a digital phase locked loop  
In a method for stabilizing a transfer function of a digital phase locked loop a random digital signal is fed into the phase locked loop. The phase locked loop comprises the transfer function and a...
7352297 Method and apparatus for efficient implementation of digital filter with thermometer-code-like output  
A technique is disclosed for processing a binary coded signal to generate a thermometer coded signal. Such technique includes the following steps. A binary coded input signal is obtained. A binary...
7352251 Systems and methods for suppressing feedback and reference noise in a phase lock loop circuit  
Various systems and methods for clock management. As one example, a system for clock management is disclosed that includes a controllable oscillator, an oscillation control source, and a sample and...
7345549 Phase locking on aliased frequencies  
A phase-locked loop ( 200 ) includes a sampler ( 202 ), a phase detector ( 210 ), a loop filter ( 212 ), and a VCO ( 214 ). The loop achieves frequency multiplication without the need for a divider...
7342459 Clock reproduction circuit  
A clock reproduction circuit receives a multi-valued input data signal to generate a reproduced clock signal with a higher accuracy. The clock reproduction circuit includes a data judgement block...
7327197 Radiation hardened phase locked loop  
A method and apparatus for providing a radiation hardened Phase Locked Loop (PLL) are presented. The radiation hardened PLL includes an adjustable bandwidth loop filter. The adjustable filter...
7323946 Lock detect circuit for a phase locked loop  
An improved system and method for determining the lock condition of a Phase Locked Loop (PLL) is described. The lock detect circuit generates a fast lock detect signal that may be used to detect a...
7323940 Adaptive cycle-slipped detector for unlock detection in phase-locked loop applications  
An adaptive cycle-slipped detector (“ACSD”) for use in a Phase-Locked Loop (“PLL”) circuit. The ACSD may include a phase comparator, a phase shifter in signal communication with the phase...
7321649 Phase locked loop with improved phase lock/unlock detection function  
A phase locked loop (PLL) having an improved phase unlock detection function generates a clock pulse signal at a frequency from a synchronization signal of a cathode ray tube (CRT) monitor and...
7317359 Circuits and methods for phase locked loop lock window detection  
Circuits and methods for detecting the lock status of a phase locked loop (PLL). The circuit generally comprises (a) a controller configured to produce a control signal in response to a reference...
7315218 Method and apparatus to center the frequency of a voltage-controlled oscillator  
A circuit and method are provided for calibrating an analog oscillator in the digital domain. The circuit and method disclosed herein centers an oscillation frequency of an analog oscillator by...
7312668 High resolution PWM generator or digitally controlled oscillator  
A high resolution pulse width modulation (PWM) or voltage controlled output (DCO) generator is disclosed. The resolution is increased over that of the circuit clock by delaying the generated signal...
7312642 Continuous, wide-range frequency synthesis and phase tracking methods and apparatus  
Circuitry and methods are provided for continuously adjustable frequency synthesis. The synthesis covers a wide range of possible frequencies and can be performed to a high degree of precision. In...
7310021 Phase-locked loop with tunable-transfer function  
Embodiments of a phase-locked loop having a tunable-transfer function are presented herein. In implementations, a multipulse generator coupled between the chase frequency detector and charge pump...
7304545 High latency timing circuit  
A phase locked loop (PLL) circuit, comprises a frequency integrator circuit that receives a target signal, a phase shift signal and a frequency gain correction parameter and that selectively...
7304518 Track and hold circuit  
A track and hold circuit ( 1 ) comprising:—a linear amplifier ( 2 ) receiving a differential analog signal (D+, D−) and being controlled by a first binary clock signal (H+) having a first...
7298216 Fine clock resolution digital phase locked loop apparatus  
A digital phase locked loop apparatus includes an input signal time detecting device that detects a phase of an input signal with prescribed time resolution obtained by dividing a cycle of an...
7292110 Self-test digital phase-locked loop and method thereof  
A phase-locked loop (PLL) apparatus utilizes a digital control unit to perform a stable phase-locking and self-testing. The PLL circuit internally generates a set of digital parameters. The set of...
7285999 Circuit for use in frequency or phase detector  
A tracking data cell ( 10 ) comprising: —a pair of track and hold circuits ( 1, 1 ′) coupled to a first multiplexer ( 5 ), —a clock signal (H+, H−) being inputted substantially in...
7283001 Noise-shaping amplifier with waveform lock  
A generalized amplifier architecture is described which employs noise-shaping feedback, and for which the output waveform closely resembles the input waveform.
7283000 Auto-adjusting high accuracy oscillator  
An auto-adjusting high accuracy oscillator is disclosed, which includes: a frequency comparator, for comparing a synchronization signal obtained from a USB host with an oscillation signal obtain...
7282999 Method and device for generating a clock signal using a phase difference signal and a feedback signal  
A method and a device for generating a clock signal (F out ) are provided, wherein a digital phase difference signal (X) is formed depending on a phase difference between a reference clock signal...
7279993 Phase-locked loop  
A phase-locked loop includes an oscillator, a phase detector coupled to the oscillator, a charge pump coupled to the phase detector, a filter coupled to the charge pump, a voltage controlled...
7279992 Circuit for detecting phase errors and generating control signals and PLL using the same  
A circuit for detecting phase errors and generating control signals includes a digital phase detector and a digital filter. The digital phase detector receives an input signal and a reference...
7279990 Sigma-delta modulator for PLL circuits  
A sigma-delta modulator for generating a modulation signal that modulates a frequency division ratio of a comparator/frequency divider of a PLL circuit. Series-connected integrators accumulate an...
7279987 Method, apparatus and program storage device for modeling an analog PLL for use in a digital simulator  
A method, apparatus and program storage device for modeling an analog PLL for use in a digital simulator are disclosed. A model of a phase locked loop to be simulated in a digital simulator...
7276978 Phase locked loop comprising a sigma-delta modulator  
The invention is directed to a phase locked loop with a ΣΔ modulator. A multimodulus divider in the feedback path of the PLL is actuated by the ΣΔ modulator. The latter has a design which can...
7274229 Coarse tuning for fractional-N synthesizers  
An improved coarse tuning process for fractional-N frequency synthesizers is provided. In general, a coarse tuning circuit controls a phase lock loop (PLL) of a frequency synthesizer such that the...
7271664 Phase locked loop circuit  
A phase locked loop circuit (PLL) has a reference terminal for receiving a reference signal and an output terminal for providing an output signal. The PLL comprises a phase comparator having first...
7268632 Structure and method for providing gate leakage isolation locally within analog circuits  
A loop filter for a phase-locked-loop is provided, comprising a set of capacitor banks coupled in parallel to form the loop filter, and a detection circuit for identifying and isolating defective...
7268629 System and method for lock detection of a phase-locked loop circuit  
Systems and methods for detecting phase-locked loop circuit lock. In particular, a lock detector configured to detect PLL stability for a user-defined period of time prior to asserting a...
7265636 Method of correcting the phase difference between two input signals of a phase-locked loop and associated device  
A method for correcting the phase difference between two input signals of a phase-locked loop may include a charge pump connected to a filter. Prior to the occurrence of the first of the two input...
7265634 System and method for phase-locked loop initialization  
Devices, methods, and systems for initializing a phased-lock loop (PLL) circuit which prevents or reduces the occurrences of voltage-controlled oscillator (VCO) frequency exceeding a divider's...
7265633 Open loop bandwidth test architecture and method for phase locked loop (PLL)  
A phase locked loop (PLL) can include a test loop filter ( 100 ) that generates a control voltage (V CTRL ) for input to a voltage controlled oscillator (VCO). In a test mode, a control voltage can...
7262725 Digital expander for generating multiple analog control signals particularly useful for controlling an oscillator  
An exemplary PLL circuit includes a VCO responsive to a plurality of sub-varactor control signals. A digital loop filter for the PLL digitally generates a varactor control word, which is digitally...
7262669 Control circuit for refresh oscillator  
The present invention relates to a circuit for controlling a refresh oscillator, and more specifically, to a circuit for controlling a refresh oscillator, wherein refresh characteristics can be...
7259635 Arbitrary frequency signal generator  
The present invention is based on the objective of constructing a PLL as arbitrary frequency generator for frequency multiplication purposes without utilizing a VCO. The invention shows a solution...
7259633 Frequency synthesizer with loop filter calibration for bandwidth control  
According to one exemplary embodiment, a frequency synthesizer module includes a loop filter, where the loop filter includes a capacitor having a first terminal and a second terminal. The frequency...
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