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8183934 PLL circuit and voltage-controlled oscillator  
In a PLL circuit, a threshold discriminator generates a control signal indicating a relative level of a control voltage. A controller outputs a controlling value based on the control signal. If the...
8134392 Phase locked loop  
A phase locked loop (PLL) which has a desired frequency characteristic even though a manufacturing process of a semiconductor integrated circuit has fluctuations. The semiconductor integrated...
8125254 Techniques for configuring multi-path feedback loops  
In some embodiments, a feedback loop circuit includes a phase detector, first and second charge pumps that are each coupled to receive an output signal of the phase detector, a first low pass...
8120394 Automatic frequency calibration circuit and automatic frequency calibration method  
An automatic frequency calibration circuit and an automatic frequency calibration method for a fractional-N frequency synthesizer are provided. In a calibration mode, a state machine adjusts a...
8089317 Phase-locked loop circuit, recording-and-reproducing apparatus, and electronic apparatus  
A phase-locked loop circuit includes a phase detection unit, a loop filter unit including a series circuit of a resistor and a capacitor, first and second pulse-current output units which supply...
8085098 PLL circuit  
A PLL circuit comprising an oscillation unit, a frequency division unit, a phase comparison unit, and a generation unit comprises a switching unit that switches between a first state in which a...
8063707 Phase locked loop  
Phase locked loop circuits capable of increasing an equivalent capacitance thereof to improve stability are provided, in which an integral part comprises a first phase frequency detector providing...
8018289 Holdover circuit for phase-lock loop  
A clock circuit includes a phase-lock loop and a holdover circuit. The phase-lock loop generates an output clock signal having a constant frequency based on a loop filter voltage of a loop filter...
7982552 Automatic frequency calibration apparatus and method for a phase-locked loop based frequency synthesizer  
An automatic frequency calibration apparatus and a method thereof for a phase-locked loop based frequency synthesizer are disclosed. The apparatus includes a frequency-to-digital converter...
7932784 Frequency and phase locked loop synthesizer  
The present invention is a frequency and phase locked loop (FPLL) synthesizer having a frequency-locked loop (FLL) operating mode and a phase-locked loop (PLL) operating mode. The FLL operating...
7873173 Active vibratory noise control apparatus  
A cosine wave over one period is stored as waveform data in a memory, and address shift values based on a phase lag in transfer characteristics from a speaker to a microphone are stored in a...
7782143 Phase locked loop and delay locked loop with chopper stabilized phase offset  
A control circuit includes a phase frequency detector that receives a reference phase ΦREF (signal) as an input and a feedback phase ΦFBK (signal) as control feedback. A voltage controlled o...
7750747 Clock selection circuit and synthesizer  
A clock selection circuit and synthesizer that is capable of selecting an optimum clock signal from among a plurality of clock signals in a short time. A reference-clock counter counts clock pulses...
7746179 Method and apparatus for selecting a frequency generating element  
A method and apparatus for selecting an optimum VCO from an array of VCOs is disclosed. Each VCO in the array has an output range and a limit. In one embodiment, a search set of VCOs is designated...
7741919 Architecture for maintaining constant voltage-controlled oscillator gain  
A voltage controlled oscillator and a method of operating a voltage-controlled oscillator are disclosed. The oscillator comprises a current controlled oscillator having a variable frequency current...
7737792 Phase Locked loop circuit and semiconductor integrated circuit device using the same  
To provide a phase locked loop circuit that is capable of performing an automatic adjustment that satisfies a desired characteristic not depending on a process variation and an environmental...
7688001 Method and system for providing a charge pump for low voltage applications  
A method and system for providing an output voltage greater than a voltage provided by a voltage supply in a semiconductor device are disclosed. The method and system include providing at least one...
7684501 Apparatus and method for carrier frequency offset and phase compensation in communication system  
The present invention provides apparatus and methods for carrier frequency offset and phase compensation, which can compensate the phase rotation of an OFDM symbol resulted from carrier frequency...
7679453 Phase-locked loop capable of dynamically adjusting phase of output signal according to detection result of phase/frequency detector, and method thereof  
A phase-locked method includes: generating a selection signal according to a detection result of a phase/frequency detector (PFD) of a phase-locked loop (PLL); generating a plurality of oscillation...
7622996 Multi-loop phase locked loop circuit  
Disclosed is a multi-loop PLL circuit and a related method of which, the circuit includes: a first loop for generating a first control current; a second loop for generating a second control...
7616066 Oscillation device and controlling method therefor  
An oscillation device includes a reference oscillation unit for generating an oscillating signal of a specific frequency; a voltage-controlled oscillation unit for generating a output oscillation...
7580443 Clock generating method and clock generating circuit  
In a clock generating circuit, while a PLL (Phase-Locked Loop) circuit and a modulator are employed, when a frequency dividing ratio of a feedback-purpose frequency divider in the PLL circuit is...
7504894 Phase locked loop circuit and semiconductor integrated circuit device using the same  
To provide a phase locked loop circuit that is capable of performing an automatic adjustment that satisfies a desired characteristic not depending on a process variation and an environmental...
7498892 Split-biased interpolated voltage-controlled oscillator and phase locked loop  
A voltage-controlled oscillator (VCO) of ring-connected stages, where each stage in the VCO has a first set of differential inverters biased by variable bias voltages, and a second set of...
7482882 Voltage control oscillation circuit and adjusting method for the same  
A voltage control oscillation (VCO) circuit and an adjusting method for the same, which enables an adjustment for suppressing the dispersion of the output characteristic in spite of the...
7453323 Circuit, control system, IC, transmitting and receiving apparatus, control method and program  
The present invention provides a circuit, a control system, an IC, a transmitting and receiving apparatus, a control method, and a program which can reduce a phase error and simultaneously suppress...
7443257 Mechanical oscillator control electronics  
A control system for a mechanical oscillator having a sinusoidal drive signal with a frequency that is a fractional multiple of a frequency of a signal of the mechanical oscillator. The drive...
7420427 Phase-locked loop with a digital calibration loop and an analog calibration loop  
A phase-locked loop (PLL) architecture (100) is provided that includes a voltage-controlled oscillator (VCO) (116). The PLL architecture (100) also includes a digital calibration loop (132) coupled...
7411464 Systems and methods for mitigating phase jitter in a periodic signal  
An oscillator circuit can generate a periodic signal, and a frequency adjustment circuit can adjust the frequency of the periodic signal. The periodic signal may include phase jitter. In one aspect...
7408415 Voltage controlled oscillator phase locked loop circuit with loop filter capacitance tuning  
A phase locked loop circuit comprises a voltage controlled oscillator with a control input to which a variable control voltage is applied and a phase-frequency discriminator with an output...
7372337 Voltage controlled oscillator comprising an injection pulling compensation circuit  
The present invention relates to a method for stabilising the operation of a voltage controlled oscillator driven by a phase locked loop, the voltage controlled oscillator delivering an RF signal...
7362826 Receiver including an oscillation circuit for generating an image rejection calibration tone  
A receiver circuit includes an oscillator circuit configured to generate a calibration tone and a phase locked loop (PLL) reference signal. An output frequency of the VCO may be divided by...
7355482 Methods and apparatus for compensating a variable oscillator for process, voltage, and temperature variations using a replica oscillator  
Circuits and methods for compensating a variable oscillator for process and/or operational variations. The circuit generally comprises (a) a replica oscillator, (b) a counter configured to count...
7342460 Expanded pull range for a voltage controlled clock synthesizer  
A technique provides a clock source that meets accuracy requirements, allows the use of a low cost resonator, provides a wide range of output frequencies, and provides suitable phase noise...
7327196 Fast switching phase lock loop (PLL) device and method  
A fast switching phase lock loop (PLL) device is provided. The PLL has a voltage controlled oscillator that generates a signal at a frequency according to a received voltage. A memory holds a set...
7323942 Dual loop PLL, and multiplication clock generator using dual loop PLL  
To provide dual loop PLLs capable of reducing the lock-up time in the initial start-up, and multiplication clock generators contributing to reduction of the power dissipation. The dual loop PLL...
7317361 Ensemble oscillator and related methods  
An ensemble clock comprises: an input for receiving a reference signal; multiple free-running oscillators each configured to generate a corresponding free-running frequency; an output oscillator...
7315218 Method and apparatus to center the frequency of a voltage-controlled oscillator  
A circuit and method are provided for calibrating an analog oscillator in the digital domain. The circuit and method disclosed herein centers an oscillation frequency of an analog oscillator by...
7304545 High latency timing circuit  
A phase locked loop (PLL) circuit, comprises a frequency integrator circuit that receives a target signal, a phase shift signal and a frequency gain correction parameter and that selectively...
7302026 Clock recovery circuit and electronic device using a clock recovery circuit  
A clock recovery circuit includes a phase discriminating circuit for discriminating, at every edge of a received data signal, phase lead or phase lag of an identically directed edge of the clock...
7301414 PLL circuit, radio-communication equipment and method of oscillation frequency control  
A Phase-Locked Loop (PPL) circuit includes a voltage controlled oscillator (VCO), a reference signal oscillator, first and second frequency dividers, a phase comparator, a charge pump and a loop...
7295077 Multi-frequency clock synthesizer  
A phase-locked loop (PLL) circuit includes an input for receiving a timing reference signal, a phase detector circuit coupled to receive the timing reference signal, a controllable oscillator...
7288998 Voltage controlled clock synthesizer  
A voltage controlled clock synthesizer includes a phase-locked loop (PLL) circuit that receives a timing reference signal, a controllable oscillator circuit, such as a VCO, providing an oscillator...
7279988 Digital frequency locked loop and phase locked loop frequency synthesizer  
A frequency synthesizer including frequency and phase locked loop that operates in either a frequency locked loop (FLL) mode or a phase locked loop (PLL) mode. In a first state, the frequency and...
7277503 Apparatus and method for synchronizing sampling frequency and carrier frequency in a multi-carrier communication system  
An apparatus and method for synchronizing sampling frequencies of a receiver and a transmitter of a multi-carrier communication system is provided. The receiver includes an estimator for estimating...
7265637 Startup/yank circuit for self-biased phase-locked loops  
An apparatus for controlling a phase-locked loop includes a detector for detecting at least one of a startup condition and a yank condition and a controller for controlling current between a charge...
7253691 PLL clock generator circuit and clock generation method  
A clock generator circuit is provided wherein a comparison clock signal is generated by comparing a standard clock signal and an operating clock signal. The comparison clock signal is converted...
7242259 Active backscatter transponder, communication system comprising the same and method for transmitting data by way of such an active backscatter transponder  
The invention relates to a device, especially an active backscatter transponder, for generating an oscillator signal based on a base signal. It comprises an oscillator for actively constructing the...
7230497 System for controlling frequency of oscillator  
System for controlling the frequency of an oscillator. A first circuit is coupled to the oscillator and arranged for receiving an externally provided clock signal at a first input node. A second...
7155190 DDS-PLL method for frequency sweep  
A high frequency sweep generator uses a DDS-PLL method for frequency sweep over wide frequency spans. A digital sweep generator produces a linear ramp signal using DDS techniques that is applied to...
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