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7616071 |
PLL circuit and semiconductor device provided with PLL circuit
Disclosed is a PLL circuit of a small circuit size capable of generating clock including a jitter component with ease. A phase comparator 11 compares the phase of an input reference clock signal...
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7616069 |
Method and system for fast PLL close-loop settling after open-loop VCO calibration
Aspects of a method and system for a fast phase-locked loop (PLL) close-loop settling after an open-loop voltage controlled oscillator (VCO) calibration are provided. A fractional-N PLL synthesizer...
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7616068 |
Frequency synthesizer for integrated circuit radios
An integrated circuit radio transceiver and method therefor includes capacitive loop filter with selectable capacitive elements that are operable to adjust a signal level provided to a voltage...
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7616067 |
Phase synchronization circuit and electronic apparatus
A phase synchronization circuit and an electronic apparatus equipped with the phase synchronization circuit are provided. The phase synchronization circuit includes an oscillation unit, a phase...
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7613267 |
Digitally-synthesized loop filter method and circuit particularly useful for a phase locked loop
In a feedback system such as a PLL, the integrating function associated with a loop filter capacitor is instead implemented digitally and is easily implemented on the same integrated circuit die as...
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7612618 |
PLL apparatus for OFDM system having variable channel bands and operating method thereof
Provided are a PLL apparatus for an OFDM system having variable channel band and an operating method thereof. The PLL apparatus includes a frequency divider for dividing an oscillating signal; a...
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7612617 |
Voltage-controlled oscillator gain calibration for two-point modulation in a phase-locked loop
A phase-locked loop (PLL) is arranged to receive high-pass data at a first input and low-pass data at a second input. A first digital input is coupled to a primary path through a digital-to-analog...
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7612590 |
Oscillating apparatus
An oscillating apparatus is provided that includes: an integration circuit that outputs a control signal based on an integration value of two inputted voltage values; an oscillator that outputs an...
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7609756 |
Rotary clock flash analog to digital converter system and method
System and method for converting an analog voltage to a digital signal. The system includes an input voltage sampler, a ramp generator, a comparator, a time-to-digital converter (TDC), and a...
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7609118 |
Phase-locked loop calibration system
Phase locked loop calibration system. Apparatus is provided for calibration of a phase-locked loop. The apparatus includes logic to calibrate an integration filter of the phase-locked loop, and...
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7609117 |
Phase-locked loop circuit with current-pulse injection for improving linearity
A phase-locked loop circuit is proposed for providing an output signal having a frequency depending on the frequency of a reference signal, the circuit including means for deriving a feedback...
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7609108 |
Phase-locked loop and compound MOS capacitor thereof
Compound MOS capacitors and phase-locked loop with the compound MOS capacitors are disclosed. In the phase-locked loop, the compound MOS capacitors of the loop filter are HV (high voltage) devices,...
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7605667 |
Frequency synthesizer with a harmonic locked phase/frequency detector
A frequency synthesizer. The frequency synthesizer comprises a harmonic locked phase/frequency detector, a low pass filter, a voltage controlled oscillator, and a frequency divider. The harmonic...
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7605664 |
All digital phase locked loop system and method
An all digital PLL system generates an analog oscillator signal at intermediate frequencies to achieve averaged oscillator frequencies at an extremely high frequency resolution. The PLL system...
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7605663 |
Method and apparatus for stabilizing output frequency of PLL (phase lock loop) and phase lock loop thereof
A method and an apparatus for stabilizing output from a Phase Lock Loop (PLL) and the PLL thereof is disclosed. The method mainly relates to enabling the control voltage of a voltage control...
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7602259 |
Voltage-controlled oscillator
A voltage-controlled oscillator has an oscillation frequency controlled through a voltage applied across ends of a variable-capacitance element. The voltage-controlled oscillator has a frequency...
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7599418 |
Method and apparatus for a frequency hopper
A method and system for generating a frequency hopping electromagnetic signal based on a baseband data signal includes a frequency hopping pre-compensator. The frequency hopping pre-compensator...
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7598816 |
Phase lock loop circuit with delaying phase frequency comparson output signals
A phase locked loop (PLL) circuit includes circuitry for preventing an erroneous condition in charge pump operation. The PLL circuit is modified by adding delay elements for connection between the...
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7595699 |
Look loop circuit and method having improved lock time
A lock loop circuit ( 230 ) includes a floating ground loop filter circuit ( 302 ) and a precharge circuit ( 304 ). The floating ground loop filter circuit includes at least one capacitive element...
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7595698 |
PLL lock time reduction
In general, in one aspect, the disclosure describes a method including determining a change in a lock state of a phase lock loop (PLL). Current provided to a charge pump (CP) is adjusted based on...
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7586379 |
Voltage controlled oscillator with operation current adjusting device
A voltage controlled oscillator has an amplifier circuit which includes an inductor and a variable capacitance element, and outputs an oscillation signal of an oscillation frequency corresponding...
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7586378 |
Method and system for using a frequency locked loop logen in oscillator systems
Aspects of a method and system for using a frequency locked loop LOGEN in oscillator systems may include generating an oscillating signal via one or more circuits comprising a feedback loop. The...
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7583773 |
Frequency synthesizing device with automatic calibration
A frequency synthesizer with automatic calibration includes a voltage-controlled oscillator, which has several working bands for receiving a coarse-tuned signal and a fine-tuned signal and...
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7583152 |
Phase-locked loop with self-correcting phase-to-digital transfer function
A phase-locked loop includes a phase-to-digital converter portion as well as a novel correction portion. The phase-to-digital converter (PDC) portion outputs a stream of first phase error words....
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7580498 |
Closed loop control system and method of dynamically changing the loop bandwidth
The invention provides a method for dynamically changing the loop bandwidth of a closed loop control system. At least one loop bandwidth parameter controls the loop bandwidth of the closed loop...
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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...
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7573348 |
Arrangement and method for determining a gradient factor for a digitally controlled oscillator, and phase locked loop
An arrangement for determining a gradient factor for a digitally controlled oscillator has a data alignment device and an identification device. The data alignment device can be supplied a...
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7570123 |
Digitally controlled analog frequency synthesizer
A frequency synthesizer according to the present invention digitally controls an analog oscillator to generate an analog output signal at a desired frequency. A digitizing circuit converts a...
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7567643 |
Phase lock loop device
A phase lock loop device further includes a probability shaping device provided between a phase detection device and charge pump and loop filter (CPLF) device. The probability shaping device...
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7567133 |
Phase-locked loop filter capacitance with a drag current
Phase-locked loop circuitry includes charge pump circuitry, loop filter circuitry, and drag current circuitry. The charge pump circuitry generates a charge pump current based on a phase of an input...
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7567132 |
Synthesizer
A synthesizer comprises a detector for detecting a parameter difference, a voltage controlled oscillator, at least one capacitor having one end connected to a node between the detector and the...
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7557671 |
Real time VCO gain non linearity calibration
A method of determining a gain nonlinearity receives a phase difference and generates an output frequency based on the received phase difference. The method reconstructs a waveform by using the...
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7557663 |
Digital PLL for a system-on-chip for digital control of electronic power devices
A digital phase locked loop (DPLL) comprising a digitally implemented voltage controlled oscillator (VCO) for producing a VCO feedback signal, a phase error counter which includes a digital...
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7554413 |
Voltage controlled oscillator with compensation for power supply variation in phase-locked loop
A voltage-controlled oscillator (VCO) according to an aspect of the present invention includes an oscillation unit and a delay time control unit. The oscillation unit generates an oscillation...
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7551039 |
Phase adjustment in phase-locked loops using multiple oscillator signals
Phase-locked loop (PLL) logic comprises an oscillator that produces a first oscillator signal and phase detect logic that determines a phase difference between the first oscillator signal and a...
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7551037 |
PLL circuit having reduced pull-in time
The PLL circuit of the present invention includes a voltage-controlled oscillator, a loop filter, and a charge pump which controls a voltage of the loop filter while the voltage-controlled...
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7548123 |
Dividerless PLL architecture
A phase-locked loop (PLL) achieves initial lock using a course fractional-N divider driving a binary phase detector. Once frequency lock is achieved, this divider may be turned off, while an...
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7548122 |
PLL with switched parameters
A system and method of operating a phase-locked loop frequency synthesizer is disclosed herein. The disclosed method includes defining a first set of operating parameters applicable to operation of...
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7545937 |
Chrominance processing arrangement having immunity to colorstripe encoding
A video system ( 100 ) includes a chrominance processing arrangement ( 200 ). The chrominance processing arrangement ( 200 ) includes a burst accumulator ( 240 ) operative to detect a polarity...
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7545223 |
PLL circuit
A PLL circuit according to an embodiment of the present invention includes: a phase comparator to output an up signal and a down signal based on a phase difference between a reference clock signal...
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7545222 |
Phase lock loop for rapid lock-in and method therefor
A phase-locked loop (PLL) for rapid lock-in applicable to digital, analog, or hybrid digital-analog PLL circuits is provided. Besides the units for basic operation, including a phase-frequency...
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7541881 |
Power supply noise insensitive charge pump, loop filter, VCO control, and VCO
An oscillating circuit includes a charge pump, a loop filter and a voltage controlled oscillator. The charge pump and the loop filter generates a differential voltage signal. The loop filter is...
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7541879 |
System for compensation of VCO non-linearity
A nonlinearity-compensated section has a pre-set compensation table containing a measured value of a voltage vtc, outputted from a loop filter, which is changed accordingly with respect to a change...
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7541877 |
Auto-adjusting high accuracy oscillator
An auto-adjusting high accuracy oscillator is disclosed, which comprises: a frequency comparator, for comparing a synchronization signal obtained from a USB host with an oscillation signal obtain...
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7538623 |
Phase locked loop modulator calibration techniques
A method for calibrating a phase locked loop begins by determining a gain offset of a voltage controlled oscillator of the phase locked loop. The processing then continues by adjusting current of a...
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7538620 |
Phase lock control system for a voltage controlled oscillator
A phase lock control system is presented for controlling a voltage controlled oscillator. The system includes a voltage controlled oscillator that produces a frequency signal exhibiting an output...
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7536164 |
Controlling the frequency of an oscillator
A technique includes selectively coupling impedances to an oscillator to establish a first frequency of operation of the oscillator. The technique includes repeating the selective coupling in a...
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7535272 |
Zero-delay buffer with common-mode equalizer for input and feedback differential clocks into a phase-locked loop (PLL)
A zero-delay clock generator has a phase-locked loop (PLL) that generates a feedback clock and receives a reference clocks. All clocks are differential and have a common-mode voltage. The...
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7528666 |
Apparatus and method for phase lock loop gain control using unit current sources
A gain compensator compensates for the gain variation of a varactor-tuned voltage tuned oscillator (VCO) in a phase lock loop (PLL). The VCO includes a parallel LC circuit having multiple fixed...
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7522005 |
KFM frequency tracking system using an analog correlator
An apparatus providing a phase/frequency modulation system is disclosed herein. The apparatus includes a first circuit configured to introduce an offset to center a signal applied to a VCO. The...
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