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6031428 Steered frequency phase locked loop  
A Steered Frequency Phase Lock Loop (SFPLL) comprises a phase loop that functions like a normal phase locked loop (PLL) and locks to the input signal, and a frequency loop that uses a reference...
6031427 System for sweeping a phase lock loop into lock with automatic initiation and shutdown  
A phase locked loop ("PLL") 28 containing apparatus for automatically causing the PLL to achieve phase lock when first energized or after having lost phase lock. In addition to a phase detector 4,...
6028902 Clock phase detecting circuit  
A clock phase detecting circuit is provided which is arranged in a receiving section of a multiplex radio apparatus. Difference detecting unit detects the difference between input and output...
6025743 PLL circuit having forcible pull-in function  
A phase locked loop (PLL) circuit performs a frequency pull-in operation with a simple structure. The PLL circuit has an oscillating part which oscillates at a frequency corresponding to a control...
6023198 Self-tuning and temperature compensated voltage controlled oscillator  
A self-tuning VCO (116) receives a control voltage input (Vcont) (114) and an adjustable programmable voltage (Vadj) (122) and provides optimized locked conditions even under variations in...
6016082 Low phase noise LC oscillator for microprocessor clock distribution  
A microprocessor includes an on-chip low phase noise CMOS LC capacitance oscillator. The LC oscillator is relatively insensitive to power supply fluctuations. In addition, the LC oscillator is...
6016069 Attenuating systems and methods for acquiring synchronization in phase locked loops  
A phase locked loop includes a controlled oscillator that is responsive to a control signal to generate an output signal, the frequency of which is a function of the control signal. A phase...
6011822 Differential charge pump based phase locked loop or delay locked loop  
A phase locked loop includes a differential charge pump to cancel static phase error and reduce sensitivity to noise. The differential charge pump comprises two substantially identical single-ended...
6011444 Voltage controlled oscillator circuit  
An object is to keep the oscillation gain nearly constant and attain an oscillation frequency with high stability and low jitter. A voltage controlled oscillator circuit (VCO) is constructed by a...
6008699 Digital receiver locking device  
The invention relates generally to transmission of digitized information and more specifically to a digital receiver locking device that provides a decreased lock-in time and minimizes requirements...
6005444 Circuits for producing control currents for a current controlled oscillator  
In a phase locked loop, a voltage controlled oscillator VCO is formed in a way known as such from a current controlled oscillator CCO (21), the actual control current (ICNTRL) of which is formed by...
6005425 PLL using pulse width detection for frequency and phase error correction  
A digital PLL in uses pulse width detection to provide frequency/phase error correction for a DCO. A pulse width detector is implemented using fine and coarse detection circuits which provide...
6005443 Phase locked loop frequency synthesizer for multi-band application  
A frequency synthesizer for generating two or more output frequency ranges using a Phase Locked Loop (PLL) circuit having a single voltage-controlled oscillator (VCO). In a first embodiment, a...
6002302 Frequency generator  
A high speed frequency generator is disclosed. The frequency generator includes a frequency oscillator producing an output signal of a predetermined frequency, a first frequency divider...
5986513 Phase locked loop with limited lock time  
A phase locked loop circuit employing a single phase detector provides limited maximum lock time by avoiding hang-up. The circuit first establishes a gross indication of phase relation sufficient...
5986514 Self-biased voltage controlled oscillator (VCO) method and apparatus  
A method and apparatus for biasing the voltage controlled oscillator (VCO) (110) of a Phase Locked Loop (PLL) (100) includes a bias circuit (114) providing a peak minimum/maximum voltage detector...
5986485 Auto-lock circuit guaranteeing low jitter in phase-locked loop frequency synthesizers irrespective of process variations  
By using a bias switch (260) to define a unique current range in a bias generator (142) for each n-bit counter output state, it is possible to control a VCO (140) which has a very wide operating...
5982836 Phase synchronizer and data reproducing apparatus  
A phase synchronizer is disclosed that provides a stable output signal while improving synchronization speed. The phase synchronizer includes one or two feedback circuits. The feedback circuit(s)...
5978427 Phase-locked loop circuit having a lock state detecting function  
A PLL circuit detects a locked state as keeping always constant the ratio of an input signal to a locked state detection reference value by automatically and continuously changing the locked state...
5977838 High-speed phase-locked loop circuit  
The present invention designs and implements a high-speed PLL circuit and a high-speed synthesizer using the high-speed PLL circuit which has an increased switching speed, a reduced number of...
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...
5973574 Oscillator system with corrective frequency modulation  
A stabilized frequency oscillating circuit outputs a pixel clock signal to an image scanner for controlling pixel rate at various writing positions along a scan line. The circuit includes a...
5973571 Semiconductor integrated circuit having a phase locked loop  
A phase locked loop in a LSI comprises a phase comparator, a low-pass filter, a voltage controlled oscillator and a frequency divider, and receives an input clock signal to output an internal clock...
5963107 Pulse-width modulation signal generator  
A pulse-width modulation signal generator having a pre-phase converter which includes N pre-delay circuits connected in cascade, and N main phase converters each of which includes M main delay...
5963100 Frequency synthesizer having a speed-up circuit  
It is an object of the present invention to provide a frequency synthesiser with a lock speed-up arrangement in a simple and effective form. In accordance with the invention there is provided a...
5963105 Trimmable circuitry for providing compensation for the temperature coefficients of a voltage controlled crystal-less oscillator  
In an integrated crystal-less device that generates an output signal with the frequency of the output signal dependent at least in part on a resistive element, there is provided circuitry for...
5959502 Analog phase-locked loop including voltage regulator  
An integrated circuit (100) includes an analog phase-locked loop circuit (10) and other circuitry (102). The integrated circuit (100) has a plurality of external connection pins (104, 106), which...
5955928 Automatically adjusting the dynamic range of the VCO in a PLL at start-up for optimal operating point  
A phase locked loop (PLL) circuit includes a phase comparator that compares the phases of an input signal and a feedback signal and generates UP and DOWN pulses that are related to the phase...
5956379 Digital phase lock detector and low-pass filter selector  
A digital phase lock detector and phase lock loop filter selector circuit implemented in hardware that dynamically selects a phase lock loop filter of appropriate bandwidth for the instant phase...
5953220 System and method for zero phase error tracking of reference in PWM inverters  
In an inverting system, a reference V REF is coupled to an input of a predictor. The predictor has an output V P and a transfer function T P . An inverter of the inverting system has a pulse...
5953071 Recovering horizontal synchronization  
A method of, a device for, and a storage medium for recovering horizontal synchronization from a TV-signal with the use of a PLL. The number of periods during which a predetermined degree of...
5952888 Roving range control to limit receive PLL frequency of operation  
A circuit comprising a plurality of phase locked loop circuits, a control circuit and a plurality of storage elements. Each of the plurality of phase locked loop circuits may present a recovered...
5949289 Voltage regulator circuit and phase-locked loop using same  
An integrated circuit (100) includes an analog phase-locked loop circuit (10) and other circuitry (102). The analog phase-locked loop circuit includes a phase detector circuit (16) which compares...
5949263 Integrated circuit comprising a phase-control loop with programmable phase shift  
A known phase-control loop comprises an oscillator having a controllable frequency, a frequency divider and a phase comparator which compares a reference signal (CKREF) with the signal at the...
5942949 Self-calibrating phase-lock loop with auto-trim operations for selecting an appropriate oscillator operating curve  
A phase-lock loop (PLL) has an oscillator having a plurality of operating curves. During PLL auto-trim operations, the oscillator is automatically trimmed to an appropriate oscillator operating...
5942926 PLL circuit  
A PLL circuit is disclosed which can achieve a locked state in a short time. The PLL circuit has a phase comparator, a loop filter and a voltage controlled oscillator. The phase comparator is...
5942947 Current-regulated, voltage-controlled oscillator with duty cycle correction  
A voltage controlled current source provides controlled current to a current controlled oscillator in a high frequency phase-locked loop clock generator. The voltage controlled current source...
5939949 Self-adjusting startup control for charge pump current source in phase locked loop  
A circuit and a method are provided for reducing power consumption in a phase-locked loop (PLL) by controlling how long the bias current for the charge pump is turned on. In such a circuit, a bias...
5939948 Phase locked loop circuit and reproducing apparatus  
A phase locked loop circuit for absorbing characteristic variations of phase comparator components beforehand in adjusting mode. With the variations thus adjusted and co-opted, any intrinsic error...
5936445 PLL-based differential tuner circuit  
Various circuit techniques to implement continuous-time filters with improved performance are disclosed. The present invention uses RMC type integrators that exhibit lower harmonic distortion. In...
5933058 Self-tuning clock recovery phase-locked loop circuit  
A self-tuning clock recovery phase-locked loop (PLL) includes a programmable divide-by-M, a phase-frequency detector, a programmable voltage-controlled oscillator (VCO), a programmable divide-by-N,...
5929678 Frequency synthesis circuit having a charge pump  
A charge pump (CP) is provides for supplying at its output (23) a first current in response to an up-pulse and sinking a second current in response to a down pulse. This charge pump includes a...
5929677 Phase locked loop having a voltage source responsive to a filtered phase difference output voltage and semiconductor device including the phase locked loop  
A phase locked loop having a charging pump circuit portion for generating a phase difference output voltage between an input signal and an oscillation output signal, and a semiconductor device...
5923196 Band-selectable phase-locked loop  
A PLL is provided which is capable of following an input frequency over an extensive range without incurring an increase in the size of circuit arrangement. The PLL 100 includes a band-selectable...
5923220 Clock reproducing device and clock reproducing method, which utilize a frequency difference and receiving interval  
The clock reproducing device includes a control device which generates a control signal for decreasing a clock frequency difference between a transmitter and a receiver according to a clock...
5920533 Clock signal extraction system for high density recording apparatus  
The invention provides a clock signal extraction circuit which can extract a synchronizing clock signal accurately from a readout waveform reproduced from information recorded in a high density and...
5920233 Phase locked loop including a sampling circuit for reducing spurious side bands  
An apparatus and method for reducing spurious sidebands in the tuning signal of phase locked loop frequency synthesizers and phase locked loops is disclosed. The frequency synthesizer includes an...
5912575 Phase-locked loop circuit with charge pump and time constant circuit  
A phase-locked loop (PLL) circuit includes a low-pass filter, a voltage controlled oscillator that produces a PLL signal having a frequency that differs according to a control voltage supplied by...
5910753 Direct digital phase synthesis  
A universal synchronizer for use in a variety of telecommunications systems based on direct digital phase synthesis (DDPS) include digital and analog PLLs. The synchronizer may be used for...
5909148 Carrier phase synchronizing circuit  
A carrier phase synchronizing circuit is disclosed, that comprises an AFC loop and a PLL, the AFC loop including an AFC complex multiplexing device, an LPF, a PLL complex multiplying device, a...
Matches 701 - 750 out of 1784 < 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 >