Matches 651 - 700 out of 1784 < 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 >
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RE36874 Supply voltage tolerant phase-locked loop circuit  
A phase-locked loop design is provide that can operate at a plurality of dissimilar supply voltages. By adjusting the frequency range of a PLL based on the power supply voltage, the same PLL design...
6121844 PLL frequency synthesizer and method for controlling the PLL frequency synthesizer  
A PLL frequency synthesizer is provided with: a voltage detector (9) for detecting the current value of a control voltage to be applied to a voltage-controlled oscillator (6); a storage device (7)...
6118345 Process and device for locking-in a YIG-tuned oscillator  
6118346 Dynamic matching of up and down currents in charge pumps to reduce spurious tones  
A device in a phase-locked loop circuit that dynamically matches the currents in a charge pump to reduce the spurious tones during each charge pump event when the phase-locked loop is in lock. A...
6114920 Self-calibrating voltage-controlled oscillator for asynchronous phase applications  
A circuit, such as a phase-lock loop (PLL), has an oscillator having a plurality of operating curves. During circuit auto-trim operations, the oscillator is automatically trimmed to an appropriate...
6111468 Charge pump with charge/discharge amount control  
A charge pump circuit which may be used in a PLL includes a charge/discharge circuit, a detection circuit and an adjusting circuit. The charge/discharge circuit performs a charge operation in...
6111469 Charge pumping circuit and PLL frequency synthesizer  
A charge pumping circuit includes a constant current source, a switch element, a first MOS transistor, a second MOS transistor, and a switching-off circuit. The constant current source generates...
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...
6107889 Phase locked loop charge pump circuit  
A charge pump circuit including current source circuits for maintaining the current sourced from an upper current source substantially equal to the current sunk by a lower current source. The...
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...
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...
6104250 Method and an apparatus for controlling an oscillator for generating a linear frequency sweep by use of a phase-locked loop  
A method and an apparatus for controlling a radar oscillator for use in the traffic field, in particular for a car radar, for generating a linear frequency sweep. A phase-locked linearization loop...
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...
6100767 Phase-locked loop with improved trade-off between lock-up time and power dissipation  
In a phase-locked loop with reference, feedback, and error signals, the trade-off between lock-up time and power dissipation is improved by one of the following methods: supplying a continuous...
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...
6094102 Frequency synthesizer using micro electro mechanical systems (MEMS) technology and method  
A frequency stabilizer circuit in the form of a charge-pump phase-lock loop utilizing a MEMS capacitance device, preferably a tunable MEMS capacitor or a MEMS capacitor bank, which more rapid and...
6094105 Oscillator with digital frequency control  
An oscillator having an adjustable output frequency comprises a resonator, an inverting amplifier coupled to the resonator, a variable capacitance coupled to the resonator and to the amplifier, and...
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...
6091303 Method and apparatus for reducing oscillator noise by noise-feedforward  
A circuit for reducing phase noise in a transmitted radio signal includes a first phase-locked loop circuit including a first controlled oscillator generating a first output signal at a first...
6091356 Chirp source with rolling frequency lock for generating linear frequency chirps  
A source for a linear homodyne transceiver that generates repeated linear chirps. A YIG oscillator with a main coil and an FM coil receives a basic linear current ramp at the main coil to generate...
6091304 Frequency band select phase lock loop device  
A multi-band phase lock loop (PLL) device for use in a communication system. The PLL comprises a frequency reference oscillator, a reference frequency divider, a phase and frequency detector, 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...
6087856 Biasing scheme for minimizing output drift in phase comparison and error correction circuits  
A phase comparison and error correction circuit which utilizes one of a plurality of outputs of its phase detector as a biasing voltage for its error correction circuit.
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...
6084481 Phase locking method and apparatus using switched drive signal  
A phase locking method and apparatus use an applied drive signal to acquire and maintain phase lock, and to prevent false locking in the presence of spurious signals. Locking signal and spurious...
6081163 Standard frequency and timing generator and generation method thereof  
A frequency standard generator includes a voltage controlled crystal oscillator (VCXO) for generating high stability output signal, a radio wave receiver to receive a radio wave which includes a...
6075394 PLL circuit and recording or reproducing apparatus utilizing the same  
In a PLL circuit, the phase of the frequency of an input signal is compared with that of an oscillation frequency generated from a voltage-controlled oscillator. Charge pump circuits are provided...
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...
6072369 Digital phase locked loop circuit for PCR recovery  
Disclosed is a DPLL circuit including a PCR register receiving and storing PCR values; an LPCR counter counted by a system clock; an LPCR register fetching an LPCR value every PCR input cycle; a...
6064274 RCB cancellation in high-side low power supply current sources  
A current source circuit for providing a stable current into a filter element of a phase-lock-loop circuit of a clock generator. The current source circuit comprises a first resistor coupled to a...
6064273 Phase-locked loop having filter with wide and narrow bandwidth modes  
A phase-locked loop utilizes a pair of diodes in a loop filter design for providing fast acquisition of a reference signal during an acquisition mode, while maintaining a more narrow bandwidth in a...
6060953 PLL response time accelerating system using a frequency detector counter  
A PLL response time is accelerated with a frequency detector counter. The PLL utilizes both a phase frequency detector and the frequency detector counter. Initially, the operation of the PLL is...
6057739 Phase-locked loop with variable parameters  
An electronic system such as a processor or computer system includes a phase-locked loop (PLL) having a PLL parameter modification circuit. In one embodiment, the PLL parameter modification circuit...
6054903 Dual-loop PLL with adaptive time constant reduction on first loop  
A phase-locked loop fabricated on an integrated circuit includes a phase/frequency detector, a charge pump, a filter node and a voltage-controlled oscillator (VCO) which are coupled together in...
6055362 Apparatus for phase synchronizing clock signals in a fully redundant computer system  
A redundant computer system including two systems capable of independent operation. The two systems correspondingly employ two independent clock generation and distribution (CGD) units which each...
6049257 Method and arrangement for frequency modulation of a high-frequency signal  
In a method and an arrangement for frequency modulation of a high-frequency signal, where the high-frequency signal is generated with an oscillator which is controlled by comparison of an actual...
6049254 Phase-locked loop which can automatically adjust to and lock upon a variable input frequency  
An apparatus is provided for automatically and dynamically adjusting a frequency division factor of a clock divider situated in the feedback loop of a phase-locked loop (PLL). The frequency...
6049255 Tuning the bandwidth of a phase-locked loop  
A phase-locked loop bandwidth is tuned to a desired level by operating the phase-locked loop in a phase-locked condition at a first frequency and applying a step response to the phase-locked loop...
6046645 Method and device for the digital control of a phase-locked loop and relative phase-locked loop thus obtained  
A method is described for the digital control of a phase-locked loop consisting in the separate estimation of both phase and frequency errors of the data source as compared with those of the local...
6046644 Phase-locked loop oscillator formed entirely of logic circuits  
Phase-locked loop oscillators that are designed to set the clock rate of electronic circuits based on combinations of logic circuits and to be integrated, at the same time as these electronic...
6046646 Modulation of a phase locked loop for spreading the spectrum of an output clock signal  
Apparatus and methods for controlling the frequency spectrum of a clock signal, for example, to reduce EMI emissions. A PLL circuit receives a reference signal and generates an output clock signal....
6043695 Phase locked loop using a schmitt trigger block  
A phase locked loop (PLL) circuit is described which uses a Schmitt trigger block (28) to achieve a very small steady state phase error at an input of a phase comparator block (21) over the entire...
6043724 Two-stage power noise filter with on and off chip capacitors  
Described is a novel implementation of a medium and high frequency on-module (off-chip)/on-chip power noise filter for power noise sensitive circuits. To achieve this, a second order low-pass...
6043716 Charge pump for phase locked loop including main and auxiliary pump circuits  
A charge pump includes a main pump circuit having a main first and second switching transistors and an auxiliary pump circuit. The charge pump is configured to provide a variable bias to at least...
6043715 Phase-locked loop with static phase offset compensation  
A phase-locked loop (PLL) has a master circuit configured to a slave circuit. The slave circuit has a phase detector, a charge pump, a loop filter, and a voltage-controlled oscillator configured to...
6043717 Signal synchronization and frequency synthesis system configurable as PLL or DLL  
A circuit including a configurable mode device configured to generate an output signal in response to a differential control signal, the differential control signal representing a phase difference...
6040742 Charge-pump phase-locked loop with DC current source  
A phase-locked loop (PLL) has a phase detector (PD), a charge pump, a loop filter, and a voltage-controlled oscillator (VCO). The PD generates DOWN pulses based on differences in phase between an...
6031429 Circuit and method for reducing lock-in time in phase-locked and delay-locked loops  
Method and circuit aspects for improving lock-in time following power-up in a phase-locked loop are provided. The circuit and method for providing same includes a phase-locked loop, the...
Matches 651 - 700 out of 1784 < 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 >