Matches 651 - 700 out of 1562 < 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 >
Match Document Document Title
5594391 N-stage ring connected voltage controlled oscillator  
A VCO includes an oscillator and a controller for controlling the operation of the oscillator. The oscillator is formed by connecting odd number of stages of delay circuits in a ring form. The...
5592129 High resolution, large multiplication factor digitally-controlled frequency multiplier  
A frequency multiplier circuit generates an supplemental high-frequency timing signal from a single, low-frequency current-controlled oscillator (CCO). The current-controlled oscillator (CCO)...
5592125 Modified bang-bang phase detector with ternary output  
A phase detector is described. The phase detector receives a data signal from an external circuit. The phase detector generates a first signal when a transition edge of the clock signal occurs...
5592110 Phase comparison circuit for maintaining a stable phase locked loop circuit in the absence of the pulse of an input signal  
A phase comparison circuit used in a phase locked loop circuit which realizes a stable phase locked loop circuit without changing the output frequency of a voltage-controlled oscillator, even if an...
5583466 Reference oscillator controlling device in very small aperture terminal  
A reference oscillator controlling device in a Very Small Aperture Terminal (VSAT) for low speed data makes a relatively unstable reference oscillator into a precise reference oscillator by...
5581214 Phase-locked loop circuit  
A timing generating circuit (9) receives a reference signal (f REF ) and an operation control signal (S 0 ) as inputs and outputs a generation control signal (S 1 ). The generation control signal...
5578968 Frequency converter, multistage frequency converter and frequency synthesizer utilizing them  
A frequency synthesizer includes a phase detector for comparing a reference frequency with a feedback frequency, a filter connected to the phase detector for permitting the passage of low frequency...
5577086 Clock signal generation circuit capable of operating at high speed with high frequency  
A clock signal generation circuit performs a stable operation with respect to both a high frequency input clock signal and a sufficient low frequency testing clock signal. The circuit includes a...
5576664 Discrete time digital phase locked loop  
A communication receiver (100) employs a discrete time digital phase locked loop (142) for maintaining a generated signal (144) locked to a reference signal (136). The discrete time digital phase...
5574407 Phase lock loop with error consistency detector  
A phase detector of a phase-lock-loop circuit measures a phase error between an output signal of an oscillator and a synchronizing signal. When a difference between the phase error that is measured...
5572167 Method and apparatus for a phase-locked loop circuit with holdover mode  
A phase-looked loop circuit with holdover mode is formed utilizing a primary and secondary phase-locked loop circuits. Each loop circuit comprises a phase detector, loop filter, VCXO and frequency...
5572168 Frequency synthesizer having dual phase locked loops  
A frequency synthesizer circuit for the front end of an RF system. The frequency synthesizer uses two pulse-swallow phase-locked loops in a synthesizer architecture that produces an output...
5568097 Ultra high availability clock chip  
A single reliable clock source that can be shared by all cards in a multiple card assembly. The clock delivers synchronous clock signals, so that there is no longer a need to provide crystal...
5563535 Direct digital frequency synthesizer using sigma-delta techniques  
A direct digital synthesizer (DDS) for generating a waveform generates a sequence of n-bit phase signals representing phase of the waveform, wherein n is an integer greater than zero. Each n-bit...
5561400 Oscillator unit  
An electrical circuit for reliably starting the oscillation of an oscillator comprising a cylindrical piezoelectric body on which an exciting electrode, a feedback electrode which causes an...
5557648 Phase lock loop circuit using a sample and hold switch circuit  
A phase lock loop circuit that can be formed into a full monolithic integrated circuit without an external component part, and that can maintain the phase locked state even for a consecutive...
5552733 Precise and agile timing signal generator based on a retriggered oscillator  
A timing signal generator produces a timing signal having one or more pulses of adjustable phase relative to pulses of a stable reference clock. The timing signal generator employs a low jitter...
5552748 Digitally-tuned oscillator including a self-calibrating RC oscillator circuit  
A digitally-tuned oscillator (DTO) includes a digital-to-analog converter (DAC) and an RC oscillator. The RC oscillator includes an RC circuit for forming a time constant equal to the RC product....
5550515 Multiphase clock synthesizer having a plurality of phase shifted inputs to a plurality of phase comparators in a phase locked loop  
A phase-locked loop wherein the output signal is effectively sampled at an increased rate from conventional phase-locked loops, allowing for a greater increase in the ratio of the output frequency...
5550514 Digital controlled xtal osc  
An unlimited number of steps or increments of given size are obtained in a delay line for phase alignment of, for instance, the signal from a crystal oscillator by momentarily switching between two...
5548249 Clock generator and method for generating a clock  
The clock generator of this invention includes: an input shutoff control circuit for receiving a base clock and a reference clock and outputting a first signal and a second signal in response to a...
5548250 Low power phase lock loop clocking circuit for battery powered systems  
According to the present invention, a PLL circuit is designed to include an active mode, a sleep mode and an idle mode. In the idle mode, the PLL draws substantially less power than that in the...
5546433 Digital phase lock loop having frequency offset cancellation circuitry  
A phase-lock loop (PLL) circuit can be locked on to a synthesizer frequency without decreasing the available range of the frequency differences which the PLL circuit can accommodate during a data...
5546052 Phase locked loop circuit with phase/frequency detector which eliminates dead zones  
A phase locked loop circuit is provided which includes a phase/frequency detector which uses a divider circuit and feedback from a clock distribution tree to generate INC and DEC pulses which do...
5546434 Dual edge adjusting digital phase-locked loop having one-half reference clock jitter  
A digital phase-locked loop having a jitter limited to one-half of a period of the reference clock comprises a generator circuit and a control circuit. The input clock is defined by a plurality of...
5541556 Clock recovery circuit for serial digital video  
A control circuit for use with a phase locked loop in a digital video receiver. The digital receiver accepts a serial digital input signal which can comprise composite or component video signals....
5539357 Phase locked loop  
PLL apparatus for generating an oscillatory signal phase locked to a component of a further signal comprises a variable oscillator for generating the oscillatory signal and a source of the further...
5534823 Phase locked loop (PLL) circuit having variable loop filter for shortened locking time  
Disclosed herein is A-phase-locked-loop PLL circuit including a voltage controlled oscillator (VCD) controlled in oscillation frequency by a control voltage, a divider dividing in frequency an...
5534822 Parallel phase-locked loop oscillator circuits with average frequency calculation of input stage loop  
A phase-locked oscillator circuit with a broad pull-in frequency range generates a stable output signal synchronized to the phase of an input signal. An input-stage phase-locking circuit wherein...
5528198 Clock signal extraction apparatus using VCO having plurality of selectable phase shifted outputs  
A plurality of clock signals at an identical frequency but with different phases are oscillated by a voltage-controlled oscillator beforehand, and selection is made of one of the clock signals...
5525932 Lock indicator for phase locked loop circuit  
A phase locked loop circuit which includes a phase/frequency detector which uses a divider circuit and feedback from a clock distribution tree to generate INC and DEC pulses which have no "dead...
5523724 Fast recovering charge pump for controlling a VCO in a low power clocking circuit  
A low power clocking circuit includes a crystal oscillator for generating a digital signal having a first frequency. The first frequency is relatively slow which allows the crystal oscillator to...
5517155 Phase locked loop having digitally controlled oscillator and pulse signal generator  
A digitally-controlled phase-locked loop oscillating circuit includes a signal period detector which detects the period of an input signal. A control data generator generates control data based on...
5517535 Numerically controlled oscillator with complex exponential outputs using recursion technique  
A numerically controlled oscillator that outputs a complex exponential value (sine and cosine). The numerically controlled oscillator inputs a scalar phase increment and uses the scalar phase...
5515302 Method for identifying excessive power consumption sites within a circuit  
A method for minimizing power consumption in a circuit is accomplished by identifying, based on the test parameters and topology information for the circuit, potential excessive power consuming...
5512860 Clock recovery phase locked loop control using clock difference detection and forced low frequency startup  
A method of generating output clock pulses using a phase locked loop which includes a voltage controlled oscillator (VCO) is comprised of providing a sequence of data pulses and a sequence of...
5511101 Phase-locked loop synthesizer  
To provide stable oscillation frequencies at small step intervals even with a high reference frequency, a PLL circuit of the present invention includes variable frequency oscillation means for...
5506530 Method for promoting activation of a phase-locked loop and corresponding loop  
The phase-locked loop includes means (3) for generating an internal signal (SIN) drawn from the output signal of the voltage-controlled oscillator (2), and a phase comparator (4) able to compare...
5506531 Phase locked loop circuit providing increase locking operation speed using an unlock detector  
A phase locked loop circuit comprising a first counter for dividing a reference frequency at a division ratio predetermined or determined by an input unit, a second counter for dividing a frequency...
5506529 Adjustable frequency synthesizer  
A phase-locked loop frequency synthesizer with adjustable frequency has blanking circuits to remove a predetermined number of pulses per second from a signal applied to an associated frequency...
5504790 Digital data phase detector  
A digital phase detector that stores four sequential digital samples in a shift register. The contents of the shift register is evaluated at one half the clock frequency which generated the digital...
5500627 Precision duty cycle phase lock loop  
An up/down counter within a phase locked loop is gated to count high frequency clock pulses during the first cycle of the input signal. Upon detection of a transition in the input signal indicating...
5498998 Method for adjusting the output frequency of a frequency synthesizer  
Adjustment of the output frequency of a frequency synthesizer can be optimized in the following manner. Once a frequency adjustment request is detected, which indicates a selected frequency, a...
5497126 Phase synchronization circuit and method therefor for a phase locked loop  
An improved phase synchronization circuit (301) and method therefor for a phase locked loop (300). Each of a divided reference frequency signal (206) and a feedback signal (209) is held in a...
5495206 Fractional N frequency synthesis with residual error correction and method thereof  
A frequency synthesizer (107) utilizes a variable oscillator (114) the output of which is used as the frequency synthesizer output (115) and is fed to a digital divider (108). The output of the...
5495205 Digital controlled oscillator and method thereof  
A digital controlled oscillator (14) generates an oscillator clock that is phase locked to a reference clock. A control circuit (12) generates a reset signal from the reference clock that sets the...
5493256 Phase locked signal generator to produce a clock signal in phase with a trigger  
A phase-locked signal generator which performs phase-locked control of the output of a triangular-wave VCO when a trigger signal is not inputted, and which performs, when the trigger signal is...
5487093 Autoranging digital analog phase locked loop  
An autoranging digital/analog (D/A) phase locked loop (PLL) 10 includes a frequency discriminator circuit 12 connected to a shift register 14. Shift register 14 is connected to a voltage controlled...
5486792 Method and apparatus for calculating a divider in a digital phase lock loop  
A digital phase lock loop (DPLL) (10) includes a first comparator (12), a second comparator (14), a third comparator (16), and adjuster (18), feedback divider (20), a threshold unit (21), a digital...
5485125 Phase-locked oscillator arrangement  
A phase-locked variable frequency oscillator arrangement includes a voltage controlled oscillator (VCO) which is controlled by a control signal produced by charging or discharging of a capacitor in...
Matches 651 - 700 out of 1562 < 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 >