Matches 401 - 450 out of 1786 < 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 >
Match Document Document Title
6714083 Lock detector and phase locked loop circuit  
There are provided a lock detector that does not output a lock detecting signal of incorrect content even when approaching phase synchronization, when an input signal stops suddenly, or when a...
6714085 Prepositioned frequency synthesizer and method therefor  
A PLL-type frequency synthesizer ( 10 ) in which a loop filter ( 24 ) state is recorded during an earlier hop to a given frequency then assigned back to the loop filter ( 24 ) during a subsequent...
6710670 Self-biasing phase-locking loop system  
A phase-locked loop configured to cause an output signal to tend toward a desired output frequency based on an applied reference signal. In a first configuration, the phase-locked loop includes a...
6710666 Charge pump structure for reducing capacitance in loop filter of a phase locked loop  
A charge pump for reducing capacitance in a loop filter of a phase locked loop. The loop filter contains a resistor and a capacitor. The charge pump includes first and second input current sources...
6707342 Multiple-VCO tuning  
A tuning circuit for use in tuning multiple voltage-controlled oscillators (VCOs) of a phase-locked loop (PLL) is provided. A search algorithm is used to determine which VCO to use for a given...
6703902 Phase locked loop for reducing electromagnetic interference  
A phase locked loop (PLL) for reducing electromagnetic interference (EMI) is provided. The PLL is not sensitive to a manufacturing process, consumes less power, occupies a small layout space, and...
6700447 Trimming of a two point phase modulator  
A frequency sythesizer and a method for synthesizing a signal having a given output frequency includes providing a controlled oscillator having a frequency control input and a feedback loop,...
6693494 Frequency synthesizer with three mode loop filter charging  
A phase-locked loop fractional-N frequency synthesizer, particularly of a sigma delta type, has a voltage controlled oscillator, a fractional-N frequency divider, a phase comparator, a charge pump,...
6693496 Method and system for low power, low jitter, wide range, self-adaptive multi-frequency phase locked loop  
A self-adaptive method for controlling a self-biased PLL system is disclosed. The method comprises providing an application-dependent input frequency; and providing an application-dependent number...
6683502 Process compensated phase locked loop  
A phase locked loop having a voltage-controlled oscillator is adjusted to compensate for process variations in the formation of the phase locked loop. In each instance of the phase locked loop, the...
6680653 VCO tuning curve compensated charge pump current synthesizer  
A system provided for controlling an output frequency of a voltage controlled oscillator relative to a reference frequency. A method includes the steps of detecting a phase error between a divided...
6680654 Phase locked loop with offset cancellation  
A phase locked loop ( 10 ) for generating a variable output frequency signal. The phase locked loop ( 10 ) includes a controlled oscillator ( 14 ) to generate the variable output frequency signal...
6677824 Changing the output frequency of a phase-locked loop  
A phase-locked loop (PLL) 1 is provided with means for changing the frequency of the output signal to a desired frequency. The PLL 1 is operated during a first period with a feedback frequency...
6670852 Oscillator tuning method  
An apparatus comprising an output circuit and a control circuit. The output circuit may be configured to generate an output signal oscillating at a frequency in response to a control signal. The...
6670855 PLL device with plural phase comparators  
In a PLL device with a plurality of phase comparators, when one phase comparator has reached a locked state, this phase comparator is allowed to keep on delivering an output, while outputs of the...
6667663 Phase locked loop circuit  
A PLL circuit having a gain control function includes: a first phase comparator for outputting a first phase difference signal indicating a phase difference between a first input signal and a...
6664831 Circuit for post-silicon control of delay locked loop charge pump current  
A charge pump design that facilitates post-fabrication control of delay locked loop charge pump current is provided. The charge pump includes an adjustment device responsive to user controlled...
6661291 Fractional and rapid response frequency synthesizer, and corresponding frequency synthesizing method  
The present invention relates a frequency synthesizer comprising in a phase-locked loop: a phase-frequency comparator ( 16 ) connected to a reference frequency source ( 20 ), at least a...
6661294 Phase-locked loop circuit  
A phase error signal indicating a most recent phase difference between an input clock signal and a feed-back signal is produced in a phase comparing unit. Also, the phase difference of the phase...
6657500 Method and system of characterization and behavioral modeling of a phase-locked loop for fast mixed signal simulation  
A piecewise linear phase locked loop frequency generator generates a voltage signal controlled by an input voltage. This frequency generator has a variable static frequency generator, whose...
6650193 Oscillator with a noise reduction function, a writer, and a method of controlling a writer  
An oscillator 10 with a noise reduction function has a memory 80 that memorizes modulation data DM for performing the spread spectrum modulation input from an output terminal fout, a modulation...
6650186 Clock pulse and data regenerator for different data rates  
A clock and data regenerator for different data rates including a control loop which is controlled by a phase discriminator (PD) and two frequency discriminators. The first frequency discriminator...
6650187 Decision directed suppressed carrier symbol-rate PLL with programmable phase discriminator and chip-rate phase extrapolation  
A phase lock loop apparatus and method is disclosed. A typical apparatus includes a demodulator receiving a phase error signal from a comparator at a chip rate and providing a phase error update...
6650190 Ring oscillator with adjustable delay  
A variable-frequency digital ring oscillator provides small and consistent frequency adjustments throughout a locked range. The ring oscillator of the invention is standard cell placeable and...
6646512 Self-bias and differential structure based PLL with fast lockup circuit and current range calibration for process variation  
A phase locked loop (PLL) circuit adjusts a voltage controlled differential oscillator to generate an output frequency signal, which is a selected multiple of an input reference signal. The PLL...
6643346 Frequency detection circuit for clock recovery  
A frequency detector is configured to provide reliable acquisition by a clock recovery and data regeneration circuit. A preferred frequency detector utilizes the output characteristics of a phase...
6642799 Phase lock loop destress circuit  
An improved phase lock loop destress circuit is described. The PLL circuit includes a loop destress logic circuit and a coarse tune digital-to-analog converter, which are coupled to a summer and...
6639475 PLL circuit  
A circuit for removing a spurious component contained in the output signal in the locked state of a PLL circuit in a fractional frequency division system. For frequency synthesizer 1 in this...
6639476 Correlator stabilized digitally tuned oscillator synthesizer  
A digitally tuned oscillator synthesizer having a correlator circuit and selectable voltage controlled oscillators is disclosed. The correlator circuit develops an accurate output which provides...
6639474 Adjustable oscillator  
The invention relates to a method for tuning an adjustable oscillator, in which oscillator at least one resonance circuit is used. The frequency of the oscillator is adjusted by changing the...
6636120 Decimated digital phase-locked loop for high-speed implementation  
A phase lock loop to control phase error from a first input signal and a second input signal including a phase error detector to detect a phase error signal between the first input signal and the...
6636575 Cascading PLL units for achieving rapid synchronization between digital communications systems  
A clock synchronization system for synchronizing a first communications device and a second communications device to enable digital communication there between. A first device generates a first...
6632687 Methods of compensating for wafer parameters  
The present invention relates to a system and method for compensating IC parameters. According to an embodiment of the present invention, a die of an IC wafer is coupled with a compensation circuit...
6631336 Nondestructive method of quality control of high-voltage systems and device for use of the method  
A method and device applicable to HV generators and X-ray tubes, and a computer program and support for the program. In the method a determination is made of a scale of values representing the...
6628171 Method, architecture and circuit for controlling and/or operating an oscillator  
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,...
6624707 Method and circuit for improving lock-time performance for a phase-locked loop  
A gain control for a phase locked loop circuit is provided. In the phase-locked loop circuit, a voltage controlled oscillator generates a reference signal responsive to the level of a tuning...
6624705 Control circuit for phase-locked loop (PLL) with reduced cycle slip during acquisition of phase lock  
A circuit for controlling a phase-locked loop (PLL) with reduced cycle slip during acquisition of phase lock includes frequency dividers with selectable divisors for the reference and feedback...
6624706 Automatic bias adjustment circuit for use in PLL circuit  
A bias current IB additionally provided to a current-controlled circuit 13 in a PLL circuit is the sum of bias currents IB 1 and IB 2 which are generated by a bias adjustment circuit ( 18, 19,...
6621354 Feedback methods and systems for rapid switching of oscillator frequencies  
Feedback methods and systems are provided to achieve rapid switching of oscillator frequencies without compromising operational feedback loop bandwidths that filter out spurious tones and phase...
6622010 Frequency synthesizer  
The present invention pertains to a type of frequency synthesizer which can correctly compensate for the ripple current. Frequency synthesizer 1 has PLL loop containing oscillator 31 and charge...
6617934 Phase locked loop circuits, systems, and methods  
A phase locked loop in an imaging system is used to generate signals on one of eight equal phase steps within a clock period. The phase locked loop outputs eight clock phases, or four clock phases...
6614319 Phase-locked loop circuit of fractional frequency-dividing type  
Disclosed is a PLL circuit that makes fractional frequency division possible without causing spurious components to be produced in the output of a VCO. The PLL circuit comprises a frequency...
6614316 Fractional integration and proportional multiplier control to achieve desired loop dynamics  
A frequency synthesizer includes a charge pump, a fractional integration counter that alters the integrated current of the charge pump, a phase frequency detector, a proportional correction...
6614318 Voltage controlled oscillator with jitter correction  
A phase controller is coupled to a voltage-controlled oscillator (VCO) in a feedback configuration, thereby reducing the phase noise introduced by the VCO. As a result, circuits using the VCO, such...
6614313 Precision oscillator circuits and methods with switched capacitor frequency control and frequency-setting resistor  
A precision oscillator circuit providing a periodic waveform is provided. A periodic waveform is provided by the use of an integrating op-amp circuit in conjunction with a switched capacitor...
6614317 Variable lock window for a phase locked loop  
A lock detector system which operates adaptively based on a frequency of operation. Different lock windows are defined for different frequencies of operation and are automatically formed based on...
6611176 Method and apparatus for two zeros/two poles active compensation phase locked loops  
A phase locked loop with two zeros/two poles active compensation. The two poles and two zeros provide increased stability with capability for narrow bandwidth and the active component (such as...
6606005 Phase-locked loop circuit capable of adjusting the frequency range of spread spectrum clock  
A circuit includes a first voltage-controlled oscillator (VCO) that generates a feedback clock. The circuit further includes a phase frequency detector, a charge pump and a loop filter that...
6606004 System and method for time dithering a digitally-controlled oscillator tuning input  
A technique of time dithering a fully digitally-controlled oscillator (DCO) tuning input employs a shift register 1306 and a multiplexer 1308 responsive to a sigma-delta modulated delay control...
6600378 Fractional-N frequency synthesizer with sine wave generator  
A fractional-N frequency synthesizer is disclosed wherein the multi-modulus frequency divider in the feedback path of the phase locked loop is controlled by a delta-sigma modulator to achieve the...
Matches 401 - 450 out of 1786 < 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 >