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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)....
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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...
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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...
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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...
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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...
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8059708 |
Pulse width digitizing method and pulse width digitizer using thereof
A pulse width (PW) digitizer comprises a current pump, a capacitor, a quantizer, a feedback controller, and a digital filter. The current pump provides a current signal in response to a PW signal....
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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...
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7999577 |
Apparatus and method for detecting a changing point of measured signal
Provided is an apparatus comprising a delaying section that generates a plurality of delayed signals by delaying a single first input signal by different delay amounts; a first acquiring section...
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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...
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7952841 |
Device for detecting malfunctions by manipulation of an internal voltage supply
A device for determining an interference with a regulated voltage provided by a control loop with a unit for monitoring a control variable of the control loop and a unit for generating a...
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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...
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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...
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7919999 |
Band-gap reference voltage detection circuit
Methods, devices, modules, and systems for a band-gap reference voltage detection circuit are provided. One embodiment for a band-gap reference voltage detection circuit includes a Brokaw cell...
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7904272 |
System and method for calculating coordinate values of a measuring machine
A method for calculating coordinate values of a measuring machine is provided. The method includes receiving signals in three dimensions from a raster ruler signal generator, identifying a...
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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...
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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...
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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,...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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7795926 |
Phase detector for half-rate bang-bang CDR circuit
A phase detector, including a sampling device, a comparing device, and an output device, is provided. The sampling device samples a data signal according to a plurality of clock signals, so as to...
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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...
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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...
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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...
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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...
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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...
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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....
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7683680 |
Combined phase comparator and charge pump circuit
A phase comparison of timing signals is made by combinational circuitry which receives the timing signals and a window signal, the window signal identifying edges of the timing signals to be...
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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...
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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...
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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...
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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...
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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...
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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...
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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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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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7463069 |
Phase detector with selection of differences between input signals
Known phase detectors have feedbackloops and do not function properly under severe conditions. By providing said phase detectors with difference establishers (1) for establishing differences...
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7463099 |
Phase detector for reducing noise
The present invention provides a method and an apparatus for reducing noise. The apparatus includes a phase detector adapted to determine a phase difference between a first and a second signal, a...
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7459949 |
Phase detector circuit and method therefor
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,...
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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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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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7417470 |
Phase frequency detector with a novel D flip flop
Methods, systems and components for use with or as a phase frequency detector. The phase frequency detector stretches its output pulse, allowing the detector to operate in a more linear region. As...
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7382163 |
Phase frequency detector used in digital PLL system
A phase frequency detector includes a phase error detector outputting a phase error signal according to a first input signal and a second input signal; a phase error judgment unit outputting a...
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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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