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7400690 Adaptive phase controller, method of controlling a phase and transmitter employing the same  
The present invention is directed to an adaptive phase controller employing a threshold level and a method of controlling a phase. In one embodiment, the adaptive phase controller includes a...
7397882 Digital phase locked circuit capable of dealing with input clock signal provided in burst fashion  
A digital phase locked circuit provides an output clock signal whose phase is synchronous with the phase of an input clock signal under a desired level of a phase absorption characteristic even if...
7386085 Method and apparatus for high speed signal recovery  
A closed-loop circuitry includes, in part, a loop filter and a current source/sink coupled to the loop filter to adjust the phase/frequency of the signal generated by the closed-loop circuitry....
7386065 Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system  
A voltage controlled oscillator (VCO), suitable for use in a frequency shift keying (FSK) system. The VCO device comprises a switching varactor unit, having a first terminal and a second terminal,...
7382849 Charge pump circuit  
Charge pump circuit. A charge pump circuit is provided for use in a phase-lock loop circuit. The charge pump circuit comprises a charge pump core circuit that outputs a control voltage. The charge...
7356077 Method and apparatus for testing network integrity  
Apparatuses and methods for testing the integrity of high speed optical fiber transmission networks are presented. Data from an optical network, for example, NRZ formatted data at forty gigabits...
7336110 Differential amplitude controlled sawtooth generator  
A dual differential sawtooth signal generator includes a first sawtooth voltage generator that has a first capacitor and a second capacitor that are alternately charged with a feedback control...
7319731 High precision continuous time gmC BPF tuning  
High precision continuous time g m C BPF (Band Pass Filter) tuning. A novel approach is presented by which a continuous time signal serves as a BPF control voltage for tuning of a BPF within a...
7277518 Low-jitter charge-pump phase-locked loop  
A phase-locked loop includes a voltage-controlled oscillator and a charge-pump loop filter. The voltage-controlled oscillator includes a varactor having a first set of capacitor cells configured to...
7274764 Phase detector system with asynchronous output override  
In one embodiment, the present invention provides a phase-locked loop comprising a charge-pump loop filter and a phase detector system. The charge-pump loop filter is configured to provide a...
7271631 Clock multiplication circuit  
A clock multiplication circuit simple in configuration, easy to adjust the characteristics thereof, and capable of shortening lockup time. The circuit delivers an output clock signal at a frequency...
7269217 PWM controller with integrated PLL  
A pulse-width modulation (PWM) controller to supply power to electronic components using a phase lock loop (PLL) is presented. A PWM controller comprises an input node operable to receive a...
7266172 Fully differential CMOS phase-locked loop  
The present invention relates in general to integrated circuits, and in particular to method and circuitry for implementing an improved phase-locked loop (PLL) in complementary...
7257183 Digital clock recovery circuit  
A clock recovery circuit includes a sampler for sampling a data signal. Logic determines whether a data edge lags or precedes a clock edge which drives the sampler, and provides early and late...
7245687 Digital phase-locked loop device for synchronizing signal and method for generating stable synchronous signal  
A phase-locked loop (PLL) device is disclosed. The PLL device includes an interpolator receiving and processing an input signal by an interpolation operation in response to an interpolation timing...
7236425 Charge pump circuit  
A charge pump circuit is provided which outputs a high voltage by using a boosting circuit with a smaller number of stages. A diode is used to give a back-gate voltage for a MOS transistor...
7212138 Delay-based analog-to-digital converter  
An analog-to-digital converter generates and adjusts a digital signal based on a delay caused by an analog signal. The analog signal controls a delay of a first delay chain, and the digital signal...
7203465 Receiver/transmitter circuit  
A receiver/transmitter circuit includes an antenna terminal, a transmitter circuit which outputs a transmission signal in response to a transmit control signal, a receiver circuit which receives a...
7203261 Phase locked loop for an OFDM system  
Techniques are provided for tracking residual frequency error and phase noise in an OFDM system. At a receiver, each received OFDM symbol is transformed with an FFT to obtain received modulation...
7202717 Chopped charge pump  
A chopped charge pump with matching up and down pulses including a first pair of current sources, a second pair of current sources, and a switching circuit for switching on in a first phase one...
7184511 Method and apparatus for data density-independent phase adjustment in a clock and data recovery system  
A data density independent clock and data recovery system includes a lock phase adjust charge pump operably coupled to receive phase information and transition information from a phase detector and...
7184510 Differential charge pump  
A differential charge pump includes a transient reducing circuit that provides multiple switching current paths to reduce transients caused by the charge transfer as the charge pump is switched....
7176732 Device and method for increasing the operating range of an electrical circuit  
A charge pump circuit and method for supplying power. The charge pump circuit includes a first circuit receiving at least one low voltage signal and generating an output voltage signal. The charge...
7162002 Phase-interpolator based PLL frequency synthesizer  
A phase lock loop frequency synthesizer includes a phase rotator in the feedback path of the PLL. The PLL includes a phase detector, a low pass filter, a charge pump, a voltage controlled...
7162001 Charge pump with transient current correction  
An improved charge pump used in a phase-locked loop includes transient current correction capability by adding a canceling capacitance for each parasitic capacitance associated with a switching...
7161436 Charge pump structure for reducing capacitance in loop filter of a phase locked loop  
A charge pump and loop filter circuit of a phase locked loop includes a resistor, a capacitor, first and second input current sources for supplying first and second currents to the circuit, a first...
7158603 Method and apparatus for compensating deviation variances in a 2-level FSK FM transmitter  
A dual-port voltage control oscillator for use in a frequency synthesizer has first and second input ports and an output. The first port is coupled in a phase-locked-loop configuration for...
7158600 Charge pump phase locked loop  
A phase lock loop circuit 60 has a phase frequency detector 62 , a charge pump 64 , an active filter 87 and a voltage-controlled oscillator 100 . The phase detector generates UP and DN...
7142823 Low jitter digital frequency synthesizer and control thereof  
A low jitter digital frequency synthesizer includes a first counter module, a second counter module, a snapshot module, an error value generation module, and a tapped delay line. The first counter...
7138838 Phase locked loop  
A variable loop bandwidth phase locked loop in which, upon input of a succession of signals “1”, no modulated signal degradation occurs and even at a high symbol rate, the reference signal...
7120217 Phase-locked loop circuit  
In a PLL circuit including a voltage-controlled oscillator, a phase detector and a final control element, the final control element contains two separate channels, between the phase detector and...
7103130 Phase-locked loop circuit  
Method and circuitry for improving the accuracy and efficiency of a phase-locked loop. More specifically, the present invention relates to a method and device for monitoring the frequency...
7092471 Digital phase synchronization circuit  
A synchronization circuit including a plurality of samplers, the plurality of samplers sampling an input signal with a plurality of respective clock signals and producing a plurality of respective...
7082178 Lock detector circuit for dejitter phase lock loop (PLL)  
A phase lock loop lock detect circuit determines whether an output signal of the phase lock loop is in phase-frequency synchronization with an input reference timing signal and provides an unlock...
7082177 Methods and devices for improving the switching times of PLLs  
The switching time of a phase-locked loop circuit is improved by switching a direct frequency control section, into and out of, the circuit.
7082176 Linearized fractional-N synthesizer with fixed charge pump offset  
A linearized oscillation synthesizer includes a phase and frequency detection module, charge pump circuit, low pass filter, voltage control oscillator, and a feedback module. The phase and...
7072431 Clock timing recovery using arbitrary sampling frequency  
A bit timing signal is regenerated from an encoded digital signal in a receiver using a predetermined sample rate F s . An input pulse signal is generated in response to predetermined transitions...
7054404 Clock control method, frequency dividing circuit and PLL circuit  
A PLL circuit includes a phase comparator; a charge pump; a loop filter; a voltage-controlled oscillator; a frequency dividing circuit; an A counter for dividing the P-frequency-divided output;...
7050524 Half-rate clock and data recovery circuit  
A half-rate clock and data recovery circuit includes a phase detector capable of operating at a half-rate, a charge pump circuit, a low pass filter, and a voltage controlled oscillator. The phase...
7042970 Phase frequency detector with adjustable offset  
A phase detection apparatus is described for use in a phase lock loop (PLL). The apparatus has a first input for a reference signal, a second input for a loop feedback signal and an output for the...
7039380 Automatic center frequency tuning of a voltage controlled oscillator  
A frequency synthesizer usable in a wireless communication device is disclosed that may ensure a low phase noise and an improved performance. The frequency synthesizer has a phase locked loop...
7023945 Method and apparatus for jitter reduction in phase locked loops  
A method and apparatus for jitter reduction in a Phase Locked Loop (PLL) that includes determining a size of a original charge pump adequate to generate an appropriate control voltage to a Voltage...
7020401 Transponder and wavelength division-multiplexing optical transmission equipment  
A wavelength converter and a wavelength division-multiplexing optical communication apparatus automatically generate clock signals of a specified frequency that match send/receive digital signals...
7016613 Linear half-rate phase detector and clock and data recovery circuit  
Method and apparatus for recovering a clock and data from a data signal. One method of the invention includes receiving the data signal having a first data rate, receiving the clock signal having a...
7016452 Delay locked loop  
A delay locked loop includes a delay unit with a controllable delay time. Switching elements are provided in order to tap off output signals from the delay elements of the delay unit. Two nodes...
7016451 Method and apparatus for generating a phase dependent control signal  
A phase detector generates a phase dependent control signal according to the phase relationship between a first and second clock signal. The phase detector includes first and second phase detector...
7016450 Clock recovery circuit and related methods  
A clock recovery circuit for generating an output signal that is synchronized with an input signal. The clock recovery circuit includes a charge pump, a first filter, an oscillator, a switch...
7012473 Current steering charge pump having three parallel current paths preventing the current sources and sinks to turn off and on  
A current steering charge pump that receives control signals and sources and sinks current in response to the control signals. One embodiment includes a main current source, secondary current...
7003066 Digital phase locked loop with phase selector having minimized number of phase interpolators  
In one embodiment of the invention, a phase selection unit for generating a recovered clock signal (SCLK), a phase select signal generator generates a phase select signals in response to a FWD...
7003065 PLL cycle slip detection  
A cycle slip detector interfaces with a phase/frequency detector (PFD), such as might be used in a phase-locked loop circuit (PLL), and indicates when cycle slips occur in the PFD. Typically, the...
Matches 1 - 50 out of 235 1 2 3 4 5 >