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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)....
8179162 Phase-lock assistant circuitry  
Some embodiments regard a circuit comprising: a first circuit configured to lock a frequency of an output clock to a frequency of a reference clock; a second circuit configured to align an input...
8144249 Multi-slicing horizontal synchronization signal generating apparatus and method  
A multi-slicing horizontal synchronization signal generating apparatus and method is provided. The apparatus includes a slicer, a numerically controlled oscillator (NCO), a first phase detector, a...
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...
8138798 Symmetric phase detector  
In one embodiment, a circuit includes a first circuit input for receiving a first input signal having a first phase; a second circuit input for receiving a second input signal having a second...
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...
8085033 Phase detector system  
A phase detection system (100) comprises an input terminal (101), first and second peak detectors (103, 113), an averaging unit (107), an offset unit (122), and a comparator (126). Input terminal...
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...
8076979 Lock detection circuit for phase locked loop  
A lock detector circuit for detecting a lock condition between a reference signal and a feedback signal includes a first counter for outputting a first counter value indicative of a number of clock...
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...
8013636 Synchronous phase detection circuit  
A phase detection circuit determines phase difference between a periodic signal and a reference signal of substantially equal frequency. The circuit includes: a source input receiving the periodic...
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...
8004336 Semiconductor memory device and method for operating the same  
A semiconductor memory device includes an edge detector configured to receive two pairs of complementary clocks to detect edges of the clocks, a comparator configured to compare output signals of...
7996701 Automated clock relationship detection  
Automated clock relationship detection may quickly and reliably detect a clock relationship with minimal latency while reducing problems due to metastability occurring at a solitary instant or...
7978800 Circuit for converting a transponder controller chip output into an appropriate input signal for a host device  
A translation circuit for mediating between a fiber-optic controller chip and a host device. The translation circuit may be on a fiber-optic transponder. The controller chip includes a phase locked...
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...
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...
7936348 Methods and apparatuses using control indicators for data processing systems  
A control indication assembly. A first control mounted on a surface of a computer is coupled to a first sensor, to a first sensing circuit to send an electrical signal to the first control when a...
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...
7915932 Semiconductor integrated circuit  
A semiconductor integrated circuit comprises: a first signal delay circuit including a first precharge element configured to precharge a first node with a leakage current and a first signal output...
7898307 Phase detector circuitry  
A phase-locked loop frequency synthesizer including phase detector circuitry and divider circuitry producing a divided signal. The phase detector circuitry receives a reference signal, a divided...
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...
7882473 Sequential equivalence checking for asynchronous verification  
Mechanisms for performing sequential equivalence checking for asynchronous verification are provided. A first model of the integrated circuit design is provided that has additional logic in it to...
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,...
7839177 Techniques for phase detection with fast reset  
A phase detector includes transistors that generate first and second phase error signals. The phase detector resets the first phase error signal in response to at least one of the first and the...
7834664 Semiconductor device for detecting a phase of a clock  
A semiconductor, which includes a first phase detecting unit configured to detect a phase of a second clock on the basis of a phase of a first clock, and generate a first detection signal...
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...
7812644 Digital frequency detector and digital phase locked loop using the digital frequency detector  
A digital frequency detector and a digital phase locked loop (PLL) are provided. The digital frequency detector includes a first conversion unit which outputs a first frequency as first frequency...
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...
7777528 Phase detection module and phase detection method  
A phase detection module includes a phase detection unit, a plurality of comparators and a decision unit. The phase detection unit is utilized for comparing a first input signal and a second signal...
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...
7764755 Synchronization of a digital circuit  
A method of synchronization of a digital circuit includes selecting a first site and a second site from a plurality of different sites of the digital circuit where a signal to be synchronized...
7764634 Suppression of acoustic feedback in voice communications  
Suppressing one or more frequency ranges of a signal prevents the occurrence of feedback in a voice data communications application. A system recognizes a frequency range in a signal where feedback...
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...
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...
7721133 Systems and methods of synchronizing reference frequencies  
System and methods of synchronizing reference frequencies are disclosed. In an exemplary implementation, a method may comprise providing separate reference frequencies for each of a plurality of...
7721137 Bus receiver and method of deskewing bus signals  
A bus receiver receives at least one first signal and a second signal both generated from a chip connected to a parallel bus. The bus receiver includes a receiving module and a deskewing module....
7683675 Radiation hardened phase frequency detector for implementing enhanced radiation immunity performance  
A method and radiation hardened phase frequency detector (PFD) are provided for implementing enhanced radiation immunity performance. The radiation hardened phase frequency detector (PFD) includes...
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...
7646227 Digital phase discriminator  
A phase discriminator for being used in a phase-locked loop to determine if a phase difference between a reference signal and a target signal has reached a programmable gap value is disclose which...
7639048 System and method of detecting a phase, a frequency and an arrival-time difference between signals  
A system and method for detecting a phase and a frequency and an arrival-time difference between two signals (118 and 120) that minimizes delay and jitter, and has stable operation even when the...
7629818 Method for checking the integrity of a clock tree  
A method and device detect synchronization errors between logic signals of a group of logic signals. A control word is loaded into a shift register arranged in loop and clocked by resulting logic...
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...
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....
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