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7498889 Analog phase controller  
Disclosed are embodiments of a phase control circuit with an analog phase controller having first and second order integration. In some embodiments, the analog control circuit generates first and...
7489203 Noise tolerant phase locked loop  
An apparatus and method for providing timing recovery under conditions of low signal to noise ratios (SNRs) is disclosed herein. A preliminary phase error signal is generated by comparing an input...
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...
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,...
7375558 Method and apparatus for pre-clocking  
A method and apparatus for pre-clocking have been disclosed.
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...
7319350 Lock-detection circuit and PLL circuit using same  
A lock-detection circuit that can set an acceptable phase-error range adapted to define a locked state and/or an unlocked state at a constant rate without being affected by a frequency and that can...
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...
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...
7145367 Fractional-integer phase-locked loop system with a fractional-frequency-interval phase frequency detector  
A phase-locked loop circuit has a fractional-frequency-interval phase frequency detector, a charge pump, an oscillator, and a divider. The fractional-frequency-interval phase frequency detector has...
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...
7084670 Phase-frequency detector with gated reference clock input  
A gated phase-frequency detector circuit includes a phase-frequency detector and a multiplexer circuit. The phase-frequency detector is arranged to provide UP and DOWN signals responsive to a...
7009461 Phase shifted binary transmission encoder, a phase modulator, and an optical network element for encoding phase shifted binary transmission  
The invention relates to a phase shifted binary transmission encoder with data input and data output, where the phase shifted binary transmission encoder includes an exclusive or gate having two...
6967503 Comparator  
A comparator compares a first binary input signal and a second binary input signal each binalized. A generator generates a reset signal at each rising edge or each falling edge of the first input...
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...
6636090 Phase-locked loop circuit outputting clock signal having fixed phase difference with respect to input clock signal  
A phase-locked loop circuit includes a first PFD (phase detector) and a second PFD. The first PFD accepts an input clock signal CLK and a feedback clock signal FBCLK, and supplies its positive...
6625765 Memory based phase locked loop  
A circuit comprising a phase detector/correction circuit, at least one column of memory cells, a control circuit and a sense amplifier. The control circuit may be configured to read a sequence from...
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...
6549041 Scheme for delay locked loop reset protection  
Systems and methods are provided for operating a delay locked loop during a reset. The systems and methods provide for activating a reset mode signal to prevent a phase lock signal from forcing the...
6275072 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...
6181175 Clock generator and synchronizing method  
Network elements of a synchronous digital communications system have a clock generator for generating a clock signal locked to an input signal. Such a clock generator comprises a tunable oscillator...
6157218 Phase-frequency detection with no dead zone  
The present invention relates to a phase detector with no dead zone comprising two detecting means and two control logic circuits. The phase-frequency detector employs the control logic circuits to...
6100721 Circuit and method of extending the linear range of a phase frequency detector  
A wireless communication system (10) uses a phase detector (28) having a first pair of flip-flops (50, 56) for detecting the phase difference between an input frequency and a reference frequency....
6087857 Clock signal phase comparator  
A clock signal phase comparator includes a first delay unit for delaying a clock signal for a predetermined time, a first phase detector for comparing an output signal of the first delay unit and a...
5977801 Self-resetting phase/frequency detector with reduced dead zone  
A phase/frequency detector, such as may be used in a phase-lock loop (PLL), having reduced jitter at high frequencies by reducing or eliminating the dead zone. The detector generates two output...
5973572 Phase lock loop circuit with variable loop gain  
A PLL (phase lock loop) circuit improves pull-in and noise performances by changing a loop gain based on the loop states. The PLL circuit includes a voltage controlled oscillator (VCO) for...
5926041 Phase detector with linear output response  
A parallel sampling phase detector with linear output response is disclosed. The parallel sampling phase detector is disclosed for use in data recovery. The device includes a voltage controlled...
5834950 Phase detector which eliminates frequency ripple  
A phase detector is disclosed that eliminates frequency ripple in a phase-locked loop circuit. The detector includes first and second circuits for providing UP and DOWN signals respectively. It...
5825173 Circuit for detecting phase angle of three-phase alternating current  
A circuit for detecting the phase angle of a three-phase alternating current includes a plurality of low-pass filters installed at each input port for removing noise and high-frequency signals...
5815016 Phase-locked delay loop for clock correction  
A controlled delay path inserts a selected delay into a clock distribution circuit to create a total clock delay that is equal to an integer number of clock cycles relative to a reference dock...
5815009 Process tolerant delay circuit having process sensitive and process insensitive components placed therein  
A process tolerant delay circuit includes a plurality of inverters that receive an input signal and provide an output signal related to the input signal but including a propagation delay of the...
5740210 Data discriminating circuit and a parallel data receiver using the same  
A data discriminating circuit is provided on the receiver side of a digital signal transmission system, and performs data discrimination with a proper phase relation settled between data and a...
5663713 Control system  
A control system comprises a controller for controlling an actuator, for instance of an electrically power assisted vehicle steering system. An unstable circuit, such as first and second cascade...
5638410 Method and system for aligning the phase of high speed clocks in telecommunications systems  
A method and system are provided for detecting and measuring a phase difference, linearly over a range of 360°, between the output signals from a primary stratum clock module (100) and a standby...
5589801 Phase comparator circuit and phase synchronization circuit  
A phase comparator circuit in which an output synchronized with the input signal may be accurately produced without producing a malfunction even in the absence of the synchronization signal, in...
5485484 Digitally implemented phase and lock indicators for a bit synchronizer  
A bit synchronizing circuit is provided with both analog and digital devices in an enhanced bit synchronizing circuit system. There is provided a digital phase detector and a digital lock detector...
5483182 Method and apparatus for a DC-DC converter an current limiting thereof  
A reference current source (38) and a matched reference transistor (40) are provided as part of a current limiting circuit, wherein the matched reference transistor (40) is scaled, electrically...
5438285 Phase/frequency comparator  
A phase/frequency comparator includes: two inputs which respectively receive first and second logic signals; a first logic gate which is at an active state during a duration equal to the phase...
5118975 Digital clock buffer circuit providing controllable delay  
A clock buffer circuit that generates a local clock signal in response to a system clock signal. The clock buffer circuit includes a buffer circuit for generating the local clock signal in response...
5097219 Pll for controlling frequency deviation of a variable frequency oscillator  
A control apparatus includes a phase comparator for generating a first control signal in accordance with the phase difference between a variable frequency signal and an input signal from the...
4975650 Phase detector  
A phase detector is provided for detecting the phase difference between a first input signal and a second input signal and providing an output corresponding thereto. The phase detector comprises a...
4959618 Differential charge pump for a phase locked loop  
A differential charge pump for use in a phase locked loop. The charge pump generates a voltage difference signal proportional to the duration of first and second pulse trains provided by a phase...
4866394 Phase synchronizing circuit for a time axis shift correcting circuit  
A phase synchronizing circuit for a time axis shift correcting circuit includes a closed-loop phase lock circuit of a phase comparator, a VCO, and a frequency division counter, for providing an...
4849704 Duty cycle independent phase detector  
A phase detecting circuit for use in phase-locked loops is provided with a pair of bistable circuits such as type D flip-flops. One of the circuits is clocked by a reference input signal and reset...
4775811 Phase comparator  
A phase comparison circuit for producing a voltage error signal proportional to the difference in phase between a reference signal and an input signal. The reference signal is in the form of a...
4728884 Infinite dynamic range phase detector  
An infinite dynamic range phase detector compares a test signal with a phase shifted reference signal which tracks the phase drift of the test signal. The incremental phase error between the test...
4712225 Phase quantizer apparatus  
Phase quantizer apparatus in an all digital phase locked loop to provide a two-part digital number representing the phase of the input signal (a noncontinuous pulse train) relative to the output...
Matches 1 - 50 out of 112 1 2 3 >