Matches 451 - 500 out of 1561 < 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 >
Match Document Document Title
6194971 Method and apparatus for phase shifting a controlled oscillator and applications thereof  
A method and apparatus for providing very small changes in the output oscillation of a controlled oscillation circuit, which may be used in a phase locked loop circuit, is accomplished by a...
6191657 Frequency synthesizer with a phase-locked loop with multiple fractional division  
A frequency synthesizer comprises a single phase-locked loop controlled by a reference clock formed by a voltage-controlled oscillator, a programmable divider with variable division rank M, a phase...
6188286 Method and system for synchronizing multiple subsystems using one voltage-controlled oscillator  
A method for synchronizing multiple subsystems using one voltage-controlled oscillator. The method includes transmitting a phase and frequency aligned output of a voltage-controlled oscillator to...
6188252 Horizontal oscillation circuit capable of changing frequency  
A frequency detection circuit detects the frequency of a horizontal sync signal, and generates a mode switching signal corresponding to the detected frequency. A voltage-controlled oscillator...
6184753 Clock delay circuitry producing clock delays less than the shortest delay element  
A oscillation circuit has a delay loop with a clock delay circuit for generating a delayed clock signal. The clock delay circuit has a selector and has multiple delay elements with delay times...
6184754 Voltage-controlled oscillator circuit and voltage-controlled oscillating method  
A VCO has n inverters connected to each other in a ring, wherein the inverters have a depletion-mode FET. A selector control circuit produces a select signal based upon a threshold voltage of a...
6181209 All-digital frequency following system  
An all-digital frequency following system is provided, which is capable of generating an output frequency which can be either an integral or an irrational multiple of an input frequency. The...
6177846 Ring oscillator type voltage controlled oscillator  
A voltage controlled oscillator includes plural cascade-connected unit circuits supplied with selection signals corresponding to an oscillation frequency. Each unit circuit includes a voltage...
6177843 Oscillator circuit controlled by programmable logic  
An apparatus comprising an oscillator circuit and a logic circuit. The oscillator circuit may be configured to present an output signal having a frequency in response to (i) a reference signal,...
6166606 Phase and frequency locked clock generator  
A phase locked loop is described for generating an output clock signal that is both synchronizing with a synchronizing signal and oscillating at substantially the same frequency as required by the...
6163186 System including phase lock loop circuit  
A PLL circuit includes a phase comparator which makes a comparison between an internal clock signal and a clock signal supplied from an external terminal, a charge pump circuit which produces a...
6160456 Phase-locked loop having adjustable delay elements  
A phase-locked loop which achieves the effect of frequency expansion is disclosed. An adjustable delay element is incorporated in a conventional phase-locked loop in order that one of the output...
6157264 Phase-locked loop with tunable oscillator  
A phased-lock loop is disclosed for capturing the frequency of the input signal by adjusting a tunable oscillator such that a zero-crossing detector detects a zero-crossing point of the input...
6157267 Variable frequency multiple loop ring oscillator  
A variable frequency oscillator including an oscillation unit including a ring oscillator having multiple loops, and a frequency control unit controlling switching among the multiple loops in...
6154096 Latched charge pump for phase locked loop  
A charge pump of a phase comparator in a phase locked loop is provided a latched comparator to minimize the effect of "dead band" during the time between charging and discharging the loop filter of...
6154097 PLL oscillating circuit including oscillating circuit with mutual conductance controlled  
A phase locked loop (PLL) oscillating circuit includes a first oscillating circuit, a lock detector and a reference oscillating circuit. The first oscillating circuit generates an oscillation...
6150889 Circuit and method for minimizing recovery time  
A circuit (70) includes a reset stage (72) and a Phase-Locked Loop (PLL) device (73). The PLL device (73) includes a phase detector (74), a charge pump (75), a filter (76), and a Voltage-Controlled...
6150891 PLL synthesizer having phase shifted control signals  
The synthesis of high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator...
6140853 Digital phase detector and charge pump system reset and balanced current source matching  
A digital phase detector and charge pump circuit system reset circuit and method resets a digital phase detector according to the charge outputs between the charge pump circuits and a following...
6140880 Circuits, architectures and methods for detecting and correcting excess oscillator frequencies  
A circuit and method for preventing an oscillator from oscillating above a first predetermined frequency or below a second predetermined frequency. The present invention may comprise (a) a clock...
6133796 Programmable divider circuit with a tri-state inverter  
A programmable dividing circuit comprises a first plurality N of similar transistor stages connected in a divide-by-N sequence, wherein N is an odd integer, the transistor stages being configured...
6127897 Zero-crossing detection type clock recovery circuit operated at symbol rate  
In a clock recovery circuit in a demodulator of a multi-level quadrature amplitude modulation (QAM) system, an analog/digital (A/D) converter performs an A/D conversion upon an analog baseband...
6127895 Clock pulse generator  
A clock pulse generator which has a signal controlled oscillator for producing output clock pulses at a repetition rate determined by the value of a control signal. Control means is operative in a...
6121845 Phase-locked loop system and method for modifying an output transition time  
A Phase-Locked Loop (PLL) system (30) and a method for modifying the output transition time of the PLL system (30). The PLL system has an input stage (36) connected to a PLL (37). The input stage...
6114917 Analog PLL circuit and method of controlling the oscillation of a voltage controlled oscillator  
The present invention provides an analog PLL circuit able to shorten a lockin time during which oscillating frequency and phase of a voltage controlling oscillator settle. An analog PLL circuit...
6114915 Programmable wide-range frequency synthesizer  
Method and circuitry for a frequency synthesizer having wide operating frequency range. The frequency synthesizer uses multiple programmable loadable counters in a phase-locked loop arrangement to...
6111471 Apparatus and method for setting VCO free-running frequency  
The present invention provides an apparatus for setting the free-running frequency of a VCO to a reference frequency. The apparatus comprises frequency range means for setting the VCO within a VCO...
6111470 Phase-locked loop circuit with charge pump noise cancellation  
The switching time of a phase-locked loop (PLL) circuit can be reduced by increasing circuit bandwidth. A charge pump system is commonly used in the PLL circuitry to drive the voltage control...
6107843 Fractional phase-locked loop coherent frequency synthesizer  
Present-day single or multiple fractional phase-locked loop frequency synthesizers are not phase coherent for they use a digital accumulator modulo a number P with a variable increment K, whose...
6107890 Digital phase comparator and frequency synthesizer  
The phase of a pulsed test signal is measured with reference to a reference signal of constant frequency by sampling the test signal at times determined by transitions in the reference signal and...
6107891 Integrated circuit and method for low noise frequency synthesis  
An integrated circuit device and method for synthesis of a signal having a desired frequency and low noise. The integrated circuit embodiment of the invention generally includes a phase locked loop...
6104251 Method and apparatus for providing transient suppression in a central processor unit (CPU) phase locked loop clock (PLL) clock signal synthesis circuit  
The present invention is directed to apparatus and methods for reducing transient signals in phase locked loop (PLL) circuits of central processing units. One aspect of the present invention is...
6100766 Correction circuit controlling sensitivities of an oscillator circuit and electronic device using the same  
A correction circuit for controlling a correction required circuit includes an oscillator circuit, and a logic circuit which counts an oscillation frequency of the oscillator circuit and thus...
6097255 Phase locked loop circuit for eliminating impulses in output data which tend to produce malfunctions  
A phase-locked loop circuit adapted to follow up with the phase of an input signal includes a phase comparator 150 for phase-comparing, in synchronism with pre-set operating clocks, an input...
6097777 Phase locked loop circuit  
The present invention is intended to reliably achieve a locked PLL even with a short VFO field to correctly perform subsequent reproduction of information data. A PLL circuit of the present...
6094101 Direct digital frequency synthesis enabling spur elimination  
The present invention, generally speaking, provides improved methods of generating clean, precisely-modulated waveforms, at least partly using digital techniques. In accordance with one aspect of...
6094100 PLL synthesizer apparatus  
Disclosed herein is a fractional N-type PLL frequency synthesizer apparatus. A fractional N-type control circuit employed therein for varying N values for each reference cycle is constructed of a...
6091305 PLL frequency synthesizer  
It is an object of the present invention to reduce the amount of spurious noise generated by an emission line spectrum of a signal propagating around the PLL of a PLL frequency synthesizer carrying...
6084480 Phase locked loop circuit including voltage controlled oscillator and low pass filter  
A PLL circuit of which pull-in time is reduced. The PLL circuit comprises a voltage controlled oscillator; a frequency divider which divides the frequency of the output signal from the voltage...
6084479 Circuit, architecture and method(s) of controlling a periodic signal generating circuit or device  
An apparatus comprising a phase-locked loop, a select circuit and a control circuit. The phase-locked loop may be configured to generate a feedback signal (along with a buffered output signal) in...
6078225 Switching algorithm for clock distribution function  
An output clock signal is generated from a selected input clock signal using a phase-locked loop (PLL). The output clock signal is used to detect failures in the selected input clock signal. If a...
6078634 Phase-locked loop circuit with a multi-cycle phase detector and multi-current charge pump  
A phase-locked loop circuit for locking the phase of an oscillator to the phase of a reference signal includes a multi-cycle phase detector (11) for detecting a phase difference between an input...
6075416 Method, architecture and circuit for half-rate clock and/or data recovery  
A circuit comprising an oscillator, a multiplexer, a half rate clock circuit and a full rate clock circuit. The oscillator may be configured to generate a first clock signal and a second clock...
6072368 Phase locked loop unlock detector  
A phase locked loop unlock detector is provided for a data detection channel in a direct access storage device (DASD). The phase locked loop unlock detector includes a counter for generating a...
6069505 Digitally controlled tuner circuit  
A digitally controlled tuner circuit for continuous-time filters. Active RC integrators include digitally programmable feedback capacitors to allow for digital fine tuning of their time constant....
6069524 FPLL with third multiplier in an analog input signal  
A FPLL has an I, a Q and a third multiplier, with the I multiplier supplying demodulated signals to a limiter and the Q multiplier supplying signals to a loop filter. A VCO and phase shift circuit...
6069535 Sequence generator for fractional frequency divider in PLL frequency synthesizer  
A sequence generator 10 for a frequency synthesiser 1,2,3,4,5,10 forming part of a direct modulator comprises an input 10a for receiving an input multibit signal X(z), an output 10c for outputting...
6066988 Phase locked loop circuit with high stability having a reset signal generating circuit  
A phase locked loop circuit includes a reset signal generating circuit for generating a reference clock signal and a reset signal from an input clock signal. A phase locked loop section generates...
6066990 Frequency divider having a prescaler followed by a programmable counter, and a corresponding prescaler and frequency synthesizer  
The invention relates to a frequency divider of the type comprising a prescaler followed by a programmable counter, and serving to divide by an overall division ratio D that can be written D=k.N+A....
6064272 Phase interpolated fractional-N frequency synthesizer with on-chip tuning  
A phase interpolated frequency synthesizer with on chip tuning includes a voltage controlled oscillator, a fractional-N divider, phase compensation and on chip tuning circuits, a phase detector,...
Matches 451 - 500 out of 1561 < 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 >