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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...
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7613974 |
Fault detection method and apparatus
This invention relates to fault detection in electrical circuits. The invention provides a method and apparatus for testing an input circuit by generating a periodic test signal having a...
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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...
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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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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...
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7586348 |
Systems, apparatuses and methods for synchronizing clock signals
An apparatus may include a first phase control circuit and/or a second phase control circuit. The first phase control circuit may compare the phase of the first clock signal with the phase of the...
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7586335 |
Digital phase detector and a method for the generation of a digital phase detection signal
The present invention concerns a digital phase detector (PD) and also a method for digital phase detection, as can in particular be used e.g. in a so-called phase locked loop (PLL). According to...
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7554607 |
Video signal detection circuit
A signal detector for detecting and indicating the duration of a signal pulse by comparing the relative polarities of two voltages generated during the two states of the pulsed signal.
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7538594 |
Method for reducing delay difference of differential transmission and system thereof
The present invention discloses a system and method for reducing delay difference of differential transmission, a certain delay difference between waveforms of the P signal and N signal is...
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7538591 |
Fast locking phase locked loop for synchronization with an input signal
A fast locking phase locked loop includes a first phase frequency detector (PFD), a second PFD, a lock detector, an up-signal output unit, a down-signal output unit, a selective charge pump, a loop...
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7532039 |
Clock signal detector
A clock signal detector is provided. The device comprises a plurality of signal delayers and a plurality of flip-flops for comparing the offset range of the clock signal between two different...
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7532038 |
Phase detecting circuit having adjustable gain curve and method thereof
A phase detecting circuit having an adjustable gain curve includes a plurality of phase detectors and a logic circuit. The phase detectors detect phase differences between a data signal and a...
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7496137 |
Apparatus for measuring jitter and method of measuring jitter
There is provided a jitter measuring apparatus for measuring jitter in a signal-under-measurement, including a pulse generating section having first pulse generating means for detecting edges of...
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7482842 |
Radiation hardened phase frequency detector for implementing enhanced radiation immunity performance
A radiation hardened phase frequency detector (PFD) is provided for implementing enhanced radiation immunity performance. The radiation hardened phase frequency detector (PFD) includes a plurality...
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7482841 |
Differential bang-bang phase detector (BBPD) with latency reduction
Bang-bang phase detection (BBPD) methods and circuits are presented for providing low latency, low jitter phase detection for use in high data-rate applications. A shortened data-path...
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7463100 |
Phase frequency detector capable of improving noise characteristics
A phase frequency detector for improving in-band phase noise characteristics of a PLL is disclosed. The phase frequency detector compares a reference frequency with a division frequency created by...
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7456661 |
Phase-locked/frequency-locked loop and phase/frequency comparator therefor
A phase/frequency comparator is described which includes two edge-triggered storage elements, each set by an edge of a reference frequency signal of a phase—or frequency-locked loop (PLL) and by...
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7449962 |
Phase-controlled current source for phase-locked loop
A phase-controlled current source for phase-locked loop is provided. The phase-locked loop includes a voltage-controlled oscillator to associate a charging path or discharging path in order to...
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7447290 |
Apparatus of phase-frequency detector
An apparatus of phase-frequency detector for adjusting wobble clock signal and wobble signal in the same phase, comprising: a first logic gate, receiving a first protection signal and a second...
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7446580 |
System and method to improve the efficiency of synchronous mirror delays and delay locked loops
A phase detection system for use with a synchronous mirror delay or a delay-locked loop in order to reduce the number of delay stages required, and therefore increase the efficiency, is disclosed....
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7443251 |
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,...
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7423456 |
Fast response time, low power phase detector circuits, devices and systems incorporating the same, and associated methods
A circuit for quickly accomplishing highly accurate phase detection using low power is described. The circuit includes a phase decision circuit that receives two clock signals and detects the phase...
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7418071 |
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...
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7411426 |
Phase detector for RZ
A phase detector is adapted to receive first and second signals and generate third and fourth signals representative of the difference between the phases of the first and second signals. The phase...
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7388408 |
Phase-frequency detector capable of reducing dead zone
A phase-frequency detector generates output signals at a first and a second output end based on input signals received at a first and a second input end. The phase-frequency detector includes two...
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7375557 |
Phase-locked loop and method thereof and a phase-frequency detector and method thereof
The phase-frequency detector may include a first flip-flop configured to generate a first signal, the first signal transitioning to a first logic level in response to a first edge of a first input...
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7368954 |
Phase comparison circuit and CDR circuit
Providing a CDR circuit having a stable clock extracting function and a data regenerating function with a high-speed data input process by reducing the operation speed of the phase comparator...
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7336106 |
Phase detector and method having hysteresis characteristics
A phase detector generates a first output signal if a feedback clock signal leads a reference clock signal by more than a first time. The phase detector generates a second output signal if the...
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7310397 |
Data recovery circuit, phase detection circuit and method for detecting and correcting phase conditions
In the data recovery circuit of the invention, a first group of sampling clock pulses is used for sampling approximately the central portions of the data bits in an incoming data stream to produce...
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7304510 |
Digital phase detector improving phase detection resolution thereof
A digital phase detector has a plurality of first delay elements through which a first clock is delayed, a plurality of second delay elements through which a second clock is delayed, and a...
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7282962 |
Inverted-phase detector
An inverted-phase detector is implemented in a system including a first clock circuit that provides a first clock signal and a delayed clock circuit that outputs an delayed clock signal. A...
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7279938 |
Delay chain integrated circuits having binary-weighted delay chain units with built-in phase comparators therein
Delay-locked loop integrated circuits include a delay chain having a plurality of delay chain units. The delay chain may be a binary-weighted delay chain and the delay chain units may be arranged...
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7271621 |
Method and apparatus for trimming a phase detector in a delay-locked-loop
Methods and apparatus are provided for trimming a phase detector in a delay-locked-loop. A latch that evaluates a phase offset between two signals is trimmed by applying two signals to the latch...
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7231009 |
Data synchronization across an asynchronous boundary using, for example, multi-phase clocks
Additional information on the phase of an external clock signal is obtained by using clock signals to determine if a phase difference between an external clock signal and a first internal sampling...
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7227386 |
Phase locked loop lock-detection circuit
An improved clock lock detection circuit is disclosed. The circuit has a first input indicating an edge of a first clock and a second input indicating a corresponding edge of a second clock wherein...
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7202707 |
High frequency binary phase detector
A phase detector includes a first flip flop having a data input coupled to a first clock signal at a first frequency and a clock input coupled to a second clock signal at a second frequency. The...
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7167031 |
Synchronizing circuit provided with hysteresis phase comparator
A synchronizing circuit includes a phase comparator having hysteresis characteristics and a dead zone, and configured to generate a frequency division ratio control signal based on a phase...
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7161391 |
Skew tolerant high-speed digital phase detector
A skew-tolerant digital phase detector is provided. Specifically, a detector is provided in the digital phase detector to detect certain failure conditions that may result from clock skew and duty...
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7157942 |
Digital frequency difference detector with inherent low pass filtering and lock detection
A structure and method for implementing a fully digital frequency difference detector uses an n-bit counter to count cycles of a reference clock signal and an m-bit counter to count cycles of a...
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7154947 |
Coincidence detection apparatus and method
This invention is to allow accurate high-speed coincidence detection while preventing any increase in circuit scale. To achieve this object, a coincidence detection apparatus includes a detector...
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7154304 |
Enhanced phase and frequency detector that improves performance in the presence of a failing clock
A system and method of reducing the pulse width differential in a phase frequency detector (PFD) is provided. In a first embodiment, a PFD is construed using a plurality of flip-flops (or clocking...
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7123524 |
Input circuit having updated output signal synchronized to clock signal
An input circuit including a first circuit, a second circuit, and a third circuit. The first circuit is configured to receive a first signal and a second signal and to sample the first signal via...
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7123069 |
Latch or phase detector device
The invention relates to a circuit device, into which a first signal and a second signal are input, wherein a first switching array is provided, by means of which it is determined which of the two...
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7119583 |
Phase detector and method having hysteresis characteristics
A phase detector generates a first output signal if a feedback clock signal leads a reference clock signal by more than a first time. The phase detector generates a second output signal if the...
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7119582 |
Phase detection in a sync pulse generator
A phase detector and phase detection method for a sync pulse generator operable in a clock synchronizer that effectuates data transfer between first circuitry disposed in a first clock domain and...
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7109760 |
Delay-locked loop (DLL) integrated circuits that support efficient phase locking of clock signals having non-unity duty cycles
Delay-locked loop (DLL) integrated circuits include digital phase comparators that are unaffected by variable duty cycle ratios. These phase comparators determine a shortest direction to phase lock...
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7102448 |
Phase frequency detector used in phase locked loop
A phase frequency detector used in a phase locked loop includes a phase error detecting unit for outputting phase error signals according to a phase error between a first input signal and a second...
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7102406 |
Phase detector, clock distribution circuit, and LSI
A phase detector includes a first selection circuit configured to select a first clock from a first group of clocks supplied to the first selection circuit and to transmit the first clock, and at...
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7095640 |
Multiple match detection circuit and method
A multiple matchline sense circuit for detecting a single, more than one, or no match conditions during a search-and-compare operation of a content addressable memory is disclosed. The circuit...
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7095353 |
Frequency to digital conversion
A technique of processing an input signal having an input signal phase is disclosed. The technique includes determining a number of transitions of the input signal within a period having a start...
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