Matches 151 - 200 out of 1561 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
Match Document Document Title
7123100 Divider circuit and oscillating circuit including the same  
A divider circuit including a plurality of latch circuits which are connected in series such that each of the latch circuits is responsive to a control signal to latch data which is output from a...
7109809 Method and circuit for reducing VCO noise  
A calibrated VCO for use in a phase-locked loop includes a low frequency calibration block for setting a bias signal for a ring oscillator to a center point to prompt the ring oscillator to...
7109815 VCO with automatic calibration  
Voltage-controlled oscillator with apparatus for automatic calibration. The voltage-controlled oscillator includes switches connecting associated coarse-tuning capacitors to an LC resonant tank of...
7106140 Calibratable phase-locked loop  
The subject matter hereof relates to a calibratable phase-locked loop. The calibratable phase-looked loop in an example embodiment comprises a charge pump and calibration means for the loop,...
7106141 Phase locked loop  
The phase locked loop according to the invention has an adjustable charge pump ( 2 ) which is intended to generate a control voltage (UVCO). A voltage-controlled oscillator ( 4 ) and an evaluation...
7106139 Amplification circuit and oscillation circuit including inverter circuits having a same threshold voltage  
A first inverter includes a plurality of first gate elements having first gate electrodes which extend in a first direction. A second inverter includes a plurality of second gate elements having...
7103132 Phase comparator and method of controlling power saving operation of the same, and semiconductor integrated circuit  
A power saving operation control method and device for a phase comparator unit are provided. The control device includes: a reference signal frequency dividing unit which divides the frequency of a...
7099639 Automatic frequency control apparatus for determining loop gain constant based on absolute phase error  
An automatic frequency control apparatus includes a mixer, a phase error detector, an absolute value converter, a determination unit, a multiplier and an oscillator. The mixer performs a frequency...
7084709 Hybrid analog/digital phase lock loop frequency synthesizer  
A hybrid frequency synthesizer includes an analog phase lock loop (PLL), a PLL, and a control circuit to control an output oscillator. The control circuit combines a control signal from the analog...
7078977 Fast locking phase-locked loop  
A phase-locked loop system, including a voltage controlled oscillator coupled with an error detector in a feedback configuration, so as to produce an output signal having a desired characteristic...
7075383 Frequency modulator, frequency modulating method, and wireless circuit  
A voltage controlled oscillator 1, a variable frequency divider 2, a phase comparator 3, and a loop filter 4 form a Phase Locked Loop (PLL). A sigma-delta modulator 5 sigma-delta...
7071787 Method and apparatus for the reduction of phase noise  
A phase locked loop type frequency synthesizer utilizing a reference signal source includes a voltage controlled oscillator (VCO), a phase comparator, a programmable pre-scaler and a modulator. The...
7068111 PLL having a multi-level voltage-current converter and a method for locking a clock phase using multi-level voltage-current conversion  
A phase locked loop (PLL) circuit having a multi-level voltage-current converter and a clock phase locking method using multi-level voltage-current conversion are described. The phase locked loop...
7064616 Multi-stage numeric counter oscillator  
A numeric counter oscillator is disclosed comprising a quotient accumulator and a remainder accumulator. The quotient accumulator has a programmable input for receiving a QUOTIENT value, a...
7053720 Configurable voltage controlled oscillator system and method including dividing forming a portion of two or more divider paths  
A phase lock loop with multiple divider paths is presented herein. The phase lock loop can be used to provide a wide range of frequencies. The phase lock loop can also be used as a portion of a...
7053727 Trimming of a two point phase modulator  
Method and system are disclosed for automated calibration of the VCO gain in phase modulators. The method and system of the invention comprises synthesizing, in a phase modulator, a signal having a...
7049896 High latency timing circuit  
A phase locked loop circuit includes a frequency integrator responsive to a received signal. A phase integrator is responsive to the frequency integrator and a phase shift measurement circuit is...
7042296 Digital programmable delay scheme to continuously calibrate and track delay over process, voltage and temperature  
The method and circuit of the present invention compensates a timing change over PVT variations without adverse impact on the system. The method and circuit uses two digital programmable delay...
7034621 Divider circuit and oscillating circuit including the same  
A divider circuit including a plurality of latch circuits which are connected in series such that each of the latch circuits is responsive to a control signal to latch data which is output from a...
7027741 Phase lock loop circuit and optical repeating apparatus, optical terminal apparatus, and optical communication system having the same  
According to a PLL circuit of the present invention, an output of a phase comparator is adjusted according to a space-to-mark transition-probability of an input signal so that an output of a...
7026878 Flexible synthesizer for multiplying a clock by a rational number  
A frequency synthesizer that includes two fractional dividers, two noise-shaped quantizers, three integer dividers, a PLL, an algorithm embodied in control logic, and an adjustment means. The...
7023282 Coarse tuning for fractional-N synthesizers having reduced period comparison error  
An improved coarse tuning process for fractional-N frequency synthesizers is provided. In general, a coarse tuning circuit controls a phase lock loop (PLL) of a frequency synthesizer. During coarse...
7020401 Transponder and wavelength division-multiplexing optical transmission equipment  
A wavelength converter and a wavelength division-multiplexing optical communication apparatus automatically generate clock signals of a specified frequency that match send/receive digital signals...
7019570 Dual-gain loop circuitry for programmable logic device  
A loop circuit (PLL or DLL) uses a dual-gain voltage-controlled component (VCO or VCDL) to achieve a phase (and frequency) lock with reduced jitter. A coarse control feedback path includes a...
7012471 Gain compensated fractional-N phase lock loop system and method  
A gain compensation technique for a fractional-N phase lock loop includes locking a reference signal with the N divider feedback signal in a phase lock loop including a phase detector, charge pump,...
7010077 Gated clock recovery circuit  
A gated clock recovery circuit is disclosed that receives an input data stream and generates a frequency and phase aligned clock output. The gated clock recovery circuit substantially...
7002414 Digital adjustable chip oscillator  
A digital adjustable chip oscillator comprises a voltage control oscillator, a reference voltage circuit, a voltage regulation circuit, a digital tuning circuit, a frequency detector and a...
7002419 Metal programmable phase-locked loop  
A phase-locked loop within an integrated circuit assembly is provided. The phase-locked loop includes a plurality of subcells of semiconductor devices arranged in a base layer pattern on base...
6999544 Apparatus and method for oversampling with evenly spaced samples  
The architecture and the method of operation of a receiver core are described. The core performs clock and data recovery on an incoming serial data stream transmitted across a wired media, such as...
6995618 VCO feedback loop to reduce phase noise  
A phase adjustment module in a voltage controlled oscillator (VCO) samples a VCO oscillation to detect changes in the oscillation frequency and produces a corresponding correction voltage that is...
6982604 CDR lock detector with hysteresis  
A lock-detect circuit is configured to detect whether an incoming signal has acquired a lock to a reference signal using a first frequency detect window and to detect whether the incoming signal...
6980059 Data directed frequency acquisition loop that synchronizes to a received signal by using the redundancy of the data in the frequency domain  
A data-directed frequency-acquisition loop capable of generating a frequency error having a magnitude and direction from a double sideband suppressed signal comprises a first multiplier that...
6977556 Rational frequency synthesizers  
A single loop PLL frequency synthesizer for operation in the MHz to GHz range, suitable for integration in integrated circuits, operates at high comparison frequencies thus achieving superior phase...
6975173 Transformation of a periodic signal into an adjustable-frequency signal  
A device for transforming a periodic input signal into an output signal of distinct frequency, comprising two adjustable delay means receiving the input signal, a multiplexer selecting the output...
6975175 Charge pump  
The present invention relates to a charge pump, in particular for use in a tuning system including a phase-locked loop, for generating currents, including a current amplifier, wherein the current...
6970046 Digital phase-locked loop  
A digital phase-locked loop with a digitally controlled oscillator is disclosed. The phase difference between a reference phase and a phase derived from the output phase of the oscillator is...
6968168 Variable oscillator  
A variable frequency oscillator comprising: an oscillatory circuit for generating a periodic output dependent on the capacitance between a first node and a second node of the circuit, and having a...
6967536 Phase-locked loop circuit reducing steady state phase error  
A phase-locked loop circuit has a DLL circuit in a stage preceding an analog PLL circuit. The DLL circuit detects a phase difference between a reference clock signal and a feedback signal, changes...
6965271 Phase-locked loop  
A phase-locked loop has associated with it a first register set ( 21 ) for holding data defining a mode of operation of the phase-locked loop; and a second register set ( 22 ) for holding data...
6960960 Frequency detector detecting variation in frequency difference between data signal and clock signal  
A reference clock signal or a clock signal delayed in phase from the clock signal by π/2 is input to D input terminal of a flip-flop circuit. An FSM receives signals input to the flip-flop...
6956441 Phase locked state detecting apparatus and image processing apparatus  
There is provided a phase locked state detecting apparatus for accurately detecting whether or not a phase locked state is canceled, the phase locked state detecting apparatus includes a comparator...
6956440 PLL having a controller for dividing values of a VCO  
A PLL can operate linearly at various frequencies by overlapping several VCOs and using a control circuit for controlling the several VCOs to select a VCO at a desired frequency. Accordingly, the...
6952141 VCO control circuit and method of operation  
A VCO control circuit includes a variable delay block, a delay counter, and a tuning range selector coupled to one or more tuning circuits, e.g. one or more VCOs, an arrangement of capacitors,...
6952138 Generation of a phase locked loop output signal having reduced spurious spectral components  
The present invention helps to mitigate and reduce the amount of interfering signals (e.g. RF leakage) that enter the phase detector of a phase locked loop by acting as a less than perfect sampler....
6949980 Phase-locked loop with high frequency adjustment of the operating range of the oscillator  
A phase-locked loop including an oscillator, controlled by a control signal generated by a comparison circuit comparing a reference frequency and the oscillator frequency and filtered by an...
6946915 Maximally digitized fractional-N frequency synthesizer and modulator with maximal fractional spurs removing  
A fractional-N frequency synthesizer using the first order Delta-Sigma frequency discriminator which is composed of only a dual modulus frequency divider and a D flip-flop is used to replace the...
6946920 Circuit for locking an oscillator to a data stream  
An apparatus comprising a control circuit and a first circuit. The first circuit may be configured to generate a calibration signal in response to an adjustment signal and a first control signal....
6943601 Method and device for phase detection  
A phase detection system is used in particular in a Delay-Locked Loop (DLL) to generate, as a function of phase differences of different signals ( 1, 2, 3 ), at least one control signal for...
6943634 Oscillation detection circuit  
An oscillation detection circuit is constituted by at least one circuitry comprising a first current source for charging a capacitor and a second current source for discharging the capacitor, which...
6940359 PLL frequency synthesizer using charge pump  
In order to reduce the possibility of disturbing the drain/absorption balance of a charge pump in the PLL frequency synthesizer using the charge pump, when the output voltage and output current of...
Matches 151 - 200 out of 1561 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >