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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...
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...
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...
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...
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...
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...
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,...
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...
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...
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,...
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...
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...
7414446 DLL circuit of semiconductor memory apparatus and method of delaying and locking clock in semiconductor memory apparatus  
A DLL circuit of a semiconductor memory apparatus includes a frequency sensing unit that generates and outputs a high frequency signal and a low frequency signal on the basis of a CAS latency...
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...
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...
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...
7323946 Lock detect circuit for a phase locked loop  
An improved system and method for determining the lock condition of a Phase Locked Loop (PLL) is described. The lock detect circuit generates a fast lock detect signal that may be used to detect a...
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...
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...
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...
7212051 Control signal generation for a low jitter switched-capacitor frequency synthesizer  
A phase detector and control signal generator responds to a reference signal and a feedback signal to produce a non-delayed up and down signal. A programmable delay unit delays the non-delayed up...
7129794 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...
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...
7109807 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...
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...
7038497 Differential current mode phase/frequency detector circuit  
A fully differential phase and frequency detector utilizes a multi-function differential logic gate to implement a differential AND gate operation and provides a fully differential D-flip-flop. The...
7038496 Device for comparison of frequencies with low temporal inertia  
The present invention relates to a device for comparison CMP, which is designed to emit a control signal Vcnt, which is representative of a difference which exists between the input signal...
7015734 Phase-frequency detector and charge pump with feedback  
An apparatus comprising a first circuit configured to generate (i) a pump up signal in response to a reference signal and a reset signal and (ii) a pump down signal in response to an input signal...
6949958 Phase comparator capable of tolerating a non-50% duty-cycle clocks  
A method and circuit for achieving minimum latency data transfer between two mesochronous (same frequency, different phase) clock domains is disclosed. This circuit supports arbitrary phase...
6946887 Phase frequency detector with programmable minimum pulse width  
A structure and associated method for reducing a static phase error in a phase-locked loop circuit. The phase-locked loop circuit comprises a voltage controlled oscillator and a phase frequency...
6937073 Frequency multiplier with phase comparator  
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...
6867654 Additive phase detector and its use in high speed phase-locked loops  
An apparatus is disclosed that is an analog phase detector where a summation technique is used to determine the phase difference of the two input waveforms of the phase detector. Instead of...
6831485 Phase frequency detector with a narrow control pulse  
A phase frequency detector with a narrow control pulse comprises mainly two substantially equivalent phase latches with a narrow control pulse, and a reset signal generating unit. Each phase latch...
6784752 Post-silicon phase offset control of phase locked loop input receiver  
A phase locked loop that includes a receiver that is adjustable to substantially match delay of a system clock and a feedback clock at an input of the phase locked loop is provided. The receiver...
6642746 Phase detector with minimized phase detection error  
A phase detector is described that includes a load circuit that presents both a high differential impedance and a low common mode impedance. The load circuit is coupled to (1) a power supply and...
6640311 Redundant oscillator and method for generating a regulated signal  
A circuit includes a signal generator and a discriminator. The signal generator generates a plurality of reference signals where a majority of the reference signals have the same phase. The...
6636079 Phase comparing circuit, PLL circuit, televisions broadcasting receiver, and method of comparing phase  
An object of the present invention is to provide a phase comparing circuit capable of outputting a signal in accordance with phase difference with a high degree of accuracy, even if the phase...
6617884 Fast locking phase frequency detector  
A phase frequency detector (PFD) circuit ( 516 ) compares two clock signals and generates a number of outputs to indicate a phase difference between these two clock signals ( 513, 519 ). The phase...
6590426 Digital phase detector circuit and method therefor  
In a feedback system such as a PLL, the integrating function associated with a loop filter capacitor is instead implemented digitally and is easily implemented on the same integrated circuit die as...
6586983 Signal phase adjustment circuit to set optimum phase  
A signal phase adjustment circuit to set an optimum phase by adjusting the difference in delay times between signal lines even when the distribution of the amount of phase modification that can be...
6556643 Majority filter counter circuit  
An improved DDLL containing a majority filter counter circuit is disclosed. The majority filter counter circuit is located between the phase detector and the shift register of the DDLL. The...
6509802 PLL-tuning system having a phase detector with a sampling frequency equal to a reference frequency  
A time discrete PLL-tuning system includes a phase detector and a voltage-controlled oscillator (VCO) for tuning the frequency (f VCO ) thereof to a frequency equal to N/M times a reference...
6496077 Phase detector for automatically controlling offset current and phase locked loop including the same  
A phase detector includes a Gilbert block for outputting a signal proportional to a phase difference between first and second input signals to a first output terminal, and a current source for...
6496042 Phase comparator for identifying and returning a non-return-to-zero receiving signal  
A phase comparator which eliminates jitter in a clock signal extracted in a phase locked loop. The phase comparator includes: a flip-flop circuit which inputs input data and the clock signal and...
6400200 Semiconductor integrated circuit which generates waveforms which are out of phase with each other  
A semiconductor integrated circuit comprises a phase control unit for shifting the phase of an input signal by two or more different fixed phases so as to generate two or more output signals out of...
6377081 Phase detection circuit  
The detection circuit comprising: a first D-type flip-flop circuit F/F 1 , to which the data signal D 1 and the clock signal C 1 are input; a first delay circuit DL 2 which delays the clock...
6333679 Phase locked loop arrangement in which VCO frequency is a fraction of reference frequency  
In a phase locked loop arrangement of a frequency synthesiser, a signal outputted from a voltage controlled oscillator is locked to a reference oscillator. A phase detector is arranged so that the...
6329847 Radio device including a frequency synthesizer and phase discriminator for such a device  
A radio device includes phase discriminator with a phase locked loop. Where when there is no phase locking, the output voltage of the phase discriminator remains constant, which provides...
6323692 Transconductance compensation circuit having a phase detector circuit with cycle slipping recovery operation and method  
A phase comparator for comparing the relative phase of a first input signal and a second input signal. The phase comparator detects a slipping condition, the slipping condition present if the first...
6317005 Process of clock recovery during the sampling of digital-type signals  
A process of clock recovery during the sampling of computer-type signals, wherein the sampling clock is generated from a phase locked loop or PLL which multiplies a given frequency by an integer...
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