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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 )...
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...
7126430 PLL circuit  
The frequency of a first voltage controlled oscillator is stabilized in a first PLL circuit part into which a reference frequency signal is inputted. In addition, a second PLL circuit part is...
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...
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...
7023284 Dual loop phase locked loop  
In a dual loop PLL having a frequency comparison loop and a phase comparison loop, when an input control circuit 30 of an up/down counter 8 receives an UP signal from a frequency comparator 7...
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...
7015762 Reference timing signal apparatus and method  
A reference timing signal apparatus with a phase-locked loop (PLL) has a computer algorithm which adaptively models the multiple frequencies of an oscillator following a training period. The...
7015738 Direct modulation of a voltage-controlled oscillator (VCO) with adaptive gain control  
Techniques for direct modulation of a voltage-controlled oscillator (VCO) with adaptive digital gain control for wideband wireless applications are disclosed. A digital adaptive gain control loop...
7005927 Low noise YIG oscillator based phase locked loop  
A low phase noise YIG oscillator based phase locked loop couples an output frequency to a delay line discriminator to provide a phase noise feedback signal to a wideband tuning port of the YIG...
7003065 PLL cycle slip detection  
A cycle slip detector interfaces with a phase/frequency detector (PFD), such as might be used in a phase-locked loop circuit (PLL), and indicates when cycle slips occur in the PFD. Typically, the...
6980581 Adaptive spread spectrum  
An apparatus comprising a circuit configured to generate a spread spectrum clock signal. The circuit may comprise a voltage controlled oscillator with a gain that may be automatically controlled.
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...
6972632 Apparatus for controlling the frequency of received signals to a predetermined frequency  
An automatic frequency controller restores symbols carried on a received signal by a data converter, and uses an in-phase and a quadrature component obtained by phase measurement from the symbol...
6956416 Powerup control of PLL  
An electronic device, such as a microprocessor, with a timing circuit. The timing circuit contains a phase locked loop that, during a first interval, checks whether a control signal in the phase...
6924705 Inject synchronous narrowband reproducible phase locked looped  
The invention discloses an injection synchronization narrowband regenerative phase-locked loop (ISNRPLL) circuit. The circuit includes a synchronous oscillation loop composed by the connecting of...
6909331 Phase locked loop having a forward gain adaptation module  
A communications system using a phase locked loop employing two-point modulation is disclosed. The phase locked loop further includes a master oscillator having an output operably coupled to a...
6894572 Device for producing an oscillator signal  
The invention relates to a device and a method for producing an oscillator signal based on a base signal. Said oscillator signal is actively constructed by an oscillator. The oscillator can be...
6894570 Fast frequency locking method and architecture realized by employing adaptive asymmetric charge-pump current mechanism  
The present invention is related to a fast frequency locking method and architecture realized by employing adaptive asymmetric charge-pump current mechanism, whose circuit is composed of elements...
6861913 Voltage-controlled oscillator with LC resonant circuit  
A voltage-controlled oscillator device with an LC-resonant circuit, in particular for implementing integrated voltage-controlled oscillators for the lower GHz range, is disclosed. The device...
6809600 Dual loop phase lock loops using dual voltage supply regulators  
Dual loop phase lock loops having a high loop bandwidth with low power consumption are described. Each loop is provided with a voltage supply regulator circuit which regulates the voltage of a...
Matches 1 - 50 out of 292 1 2 3 4 5 6 >