Matches 1 - 50 out of 468 1 2 3 4 5 6 7 8 9 10 >

CobaltIP-faceted-search-demo
Match Document Document Title
8179163 Method and apparatus for charge pump linearization in fractional-N PLLs  
Efficient techniques improve the linearity of a charge pump in fractional-N PLLs. A feedback clock pulse several VCO clock periods wide is formed and supplied to a phase frequency detector (PFD)....
8138799 Inter-phase skew detection circuit for multi-phase clock, inter-phase skew adjustment circuit, and semiconductor integrated circuit  
An inter-phase skew detection circuit includes a frequency division circuit that frequency-divides N-phase clocks to be measured at predetermined timings so as to generate N+2 frequency-divided...
8138800 Phase detecting circuit and PLL circuit  
A phase detecting circuit includes a latch circuit that switches, based on an OR signal and an AND signal of two clock signals to be subjected to phase comparison, one of outputs used for...
8081013 Digital phase and frequency detector  
A method for digital phase detection, comprises the steps of: providing a reference clock; receiving a feedback clock; determining a timing difference between the reference clock and the feedback...
8058915 Digital phase-locked loop and digital phase-frequency detector thereof  
A digital phase-locked loop and a digital phase-frequency detector thereof are provided. The digital PFD includes a divisor switch unit, a low-resolution phase-error detecting unit, an accumulating...
8026742 Phase detector  
In one embodiment, a phase detector is provided comprising a first input, a second input, and first circuitry in communication with the first and second inputs, the first circuitry operative to...
8013641 Frequency synthesizer including a digital lock detector  
There is provided a digital lock detector and a frequency synthesizer using the same. The digital lock detector includes a comparator unit receiving a plurality of control bits, and generating a...
8008946 Semiconductor integrated circuit  
A first counter detects a rising edge of a clock signal, and generates a first signal having a multiplied cycle of the clock signal. A second counter detects a falling edge of the clock signal, and...
8008947 Balanced phase detector  
Methods and apparatus are disclosed, such as those involving a digital phase detector that includes a phase detection circuit configured to detect which one of two clock signals leads the other....
7983361 Clock data recovery circuit  
A clock data recovery circuit. The clock data recovery circuit comprises a transmission line, a phase locked loop, a voltage controlled oscillator, a phase selector, and a D flip-flop. The...
7969202 Fractional-N frequency synthesizer  
A circuit, with applications to phase-locked loops and frequency synthesis, where a divider circuit shuffles between dividing the output of a voltage-controlled oscillator by N or N+1, where N is...
7965143 Digital phase detector and phase-locked loop  
A digital phase detector is provided that can be easily implemented in gate array or FPGA, to accurately quantize a phase difference of two clocks and convert to a digital value without using delay...
7965108 Frequency synthesizer  
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...
7956658 Digital lock detector and frequency synthesizer using the same  
There is provided a digital lock detector and a frequency synthesizer using the same. The digital lock detector includes a comparator unit receiving a plurality of control bits, and generating a...
7940088 High speed phase frequency detector  
Apparatus and methods detect missing clock edges. An improved phase frequency detector (PFD) can be used in, for example, a phase locked loop (PLL) or a delay locked loop (DLL). Conventional PFDs...
7919991 Comparator circuit  
A comparator circuit is disclosed that determines whether a first binary value is greater than, equal to, and/or less than a second binary value without employing binary adder circuits, and...
7920119 Drive circuit for electro-optical apparatus, method of driving electro-optical apparatus, electro-optical apparatus, and electronic system  
At least one of a scanning-line drive part and a data-line drive part includes: a shift register for outputting transfer signals in sequence; a first enable supply line for supplying a plurality of...
7919992 Charge recycling amplifier for a high dynamic range CMOS imager  
A high dynamic range amplifier circuit for amplifying pixel signals of an imager device is disclosed. The amplifier circuit uses a read-out scheme based on a charge recycling approach, where a...
7893724 Method and circuit for rapid alignment of signals  
Circuits and methods for aligning two or more signals including a first and second signal. In one embodiment, a shift register generates two or more shifted copies of the second signal, and each of...
7893725 Delay locked loop circuit  
The disclosure relates to phase detectors. Charge up and charge down signals that are generated by a phase detector cause i) following detection of a first edge of a reference clock signal,...
7889012 System and method for cycle slip prevention in a frequency synthesizer  
An improved method of cycle slip prevention in a frequency synthesizer is achieved by determining phase error between a divided VCO and reference, determining whether a phase error of a full cycle...
7885361 Method and apparatus for 0/180 degree phase detector  
An embodiment of the present invention provides a system for detecting a phase-shifted signal at high frequencies in data and clock recovery circuitry. An up-pulse generator, in one embodiment,...
7855580 Phase comparator, phase synchronizing circuit, and phase-comparison control method  
A phase comparator includes an edge detecting unit to which a reference signal is input and to which a referred signal based on the reference signal is input as a feedback signal. The edge...
7847641 Digital phase and frequency detector  
Disclosed are a digital phase-frequency detector and a method of operating a digital phase-frequency detector. The detector includes an input circuit, an output circuit and a reset circuit. In use,...
7839179 Balanced phase detector  
Methods and apparatus are disclosed, such as those involving a digital phase detector that includes a phase detection circuit configured to detect which one of two clock signals leads the other....
7839178 High speed digital phase/frequency comparator for phase locked loops  
An apparatus and method for detecting a phase difference between an input signal and a reference signal in an all-digital phase locked loop (PLL) are provided. In a preferred embodiment, an N-stage...
7830190 Data latch circuit with a phase selector  
The present invention provides a data latch circuit. The data latch circuit includes a first data latch unit, a second data latch unit, a third data latch unit, and a phase selector. The first data...
7821301 Method and apparatus for measuring and compensating for static phase error in phase locked loops  
A method and circuit for static phase error measurement includes a reference clock delay chain having a selectable number of delay elements. A number of the delay elements are enabled in accordance...
7795925 Phase difference detector and phase difference detection method  
A phase difference detector for detecting a phase difference between input clocks which both have a same first frequency, including: a pulse width conversion unit for converting the input clocks...
7791378 Phase detector  
In one embodiment, a phase detector is provided comprising a first input, a second input, and first circuitry in communication with the first and second inputs, the first circuitry operative to...
7769121 Phase detector for data communications  
In one embodiment, a phase error signal generated by a phase detector is equalized to compensate for the distortion in the phase error signal due to finite circuit speeds. The equalization may be...
7764088 Frequency detection circuit and detection method for clock data recovery circuit  
A frequency detection circuit and a detection method thereof suitable for a clock data recovery (CDR) circuit are provided. The frequency detection circuit includes a phase detector, a first...
7764759 Linear sample and hold phase detector for clocking circuits  
Linear sample and hold phase detectors are disclosed herein. An example phase detector is coupled to an input data signal and a recovered clock signal and includes a linear phase difference...
7760030 Phase detection circuit and method thereof and clock recovery circuit and method thereof  
The phase detection circuit may allow an operating speed of a semiconductor circuit to be increased irrespective of whether a combinational logic circuit within the semiconductor circuit operates...
7755397 Methods and apparatus for digital phase detection with improved frequency locking  
Methods and apparatus are provided for digital phase detection with improved frequency locking. A phase detector is disclosed for evaluating a phase difference between a clock signal and a...
7755402 Calibration of separate delay effects for multiple data strobe signals  
Embodiments for positioning rising and/or filling edges of data strobe signals are disclosed. One example embodiment may comprise receiving a data signal, positioning an edge of a first delayed...
7750683 Phase/frequency detector  
PFD includes UP and DOWN signal modules, and RESET signal module. UP and DOWN signal modules transmit UP and DOWN signals according to reference and fed-back clock signals. RESET module includes...
7728631 Phase frequency detector with pulse width control circuitry  
A phase frequency detector comprising a detection circuit and a reset circuit. The phase frequency detector may receive a feedback signal having a predetermined pulse width. The detection circuit...
7692501 Phase/frequency detector and charge pump architecture for referenceless clock and data recovery (CDR) applications  
A stream of data may flow over a fiber or other medium without any accompanying clock signal. The receiving device may then be required to process this data synchronously. Embodiments describe...
7675335 Phase detecting module and related phase detecting method  
A phase detecting module includes a phase detecting unit, a comparator and a counter. The phase detecting unit is arranged to compare a first input signal and a second input signal to generate a...
7675328 Phase detection apparatus and phase synchronization apparatus  
A feedback circuit includes a third variable delay device that controls the amount of phase delay of a first clock; a third logic gate that detects a phase difference between the first clock...
7643598 Frequency lock detector  
Provided is a frequency lock detector which includes one counter and a clock number difference detector for detecting a clock number difference while not increasing complexity according to the...
7643599 Method and apparatus for detecting linear phase error  
Disclosed herein is a method and apparatus used to detect phase error information between edges of an input data signal and a clock signal for use at ultra-high frequencies and where linear phase...
7622959 Phase comparator and semiconductor device with phase comparator  
It is an object of the present invention to improve the phase difference detection accuracy of a phase comparator. A phase difference signal generation circuit outputs a signal C_SIGNAL which takes...
7622960 Metastable-resistant phase comparing circuit  
A phase comparing circuit includes a first storage circuit for reading an external clock signal based on a control clock signal; first and second inverters for inverting a signal from the first...
7616065 System and method for charge-pump with phase-frequency detection capability  
A method of generating a correction signal for a voltage controlled oscillator (VCO) includes receiving a first signal in a correction current generator, changing a state of a first error signal...
7609102 Pattern-dependent phase detector for clock recovery  
A phase detector apparatus and method used for clock recovery from a data signal is provided. The phase detector provides phase correction signals to a clock signal generator, where the phase...
7609092 Automatic phase-detection circuit for clocks with known ratios  
An automatic phase detection circuit for generating an internal synchronization signal when two clock input signals achieve a certain phase relationship. No external reference signal is required....
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...
7598775 Phase and frequency detector with zero static phase error  
A method and circuit for phase and frequency detection having zero static phase error for use in a phase-locked loop system is presented. The phase and frequency detector utilizes a first phase and...
Matches 1 - 50 out of 468 1 2 3 4 5 6 7 8 9 10 >