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8138841 Apparatus and method for controlling the output phase of a VCO  
A method and apparatus controlling the output phase of a VCO (Voltage Controlled Oscillator). The apparatus has a phase locked loop 20 having a first input 21 for receiving a reference signal and a...
8126079 High-speed serial data signal interface circuitry with multi-data-rate switching capability  
High-speed serial data signal transmitter and/or receiver circuitry is able to dynamically switch between handling data at two (or more) different data rates. Such a switch can be made very rapidly...
8120431 Variable loop bandwidth phase locked loop  
An apparatus comprising a voltage controlled oscillator, a first charge pump, a second charge pump, a switch circuit and a comparator circuit. The voltage controlled oscillator may be configured to...
8115558 Digital PLL circuit and semiconductor integrated circuit  
A digital PLL circuit includes: an oscillation circuit, wherein an oscillation frequency is controlled by changing the number of capacitance elements to be connected in parallel to an inductance...
8111106 Switched phase and frequency detector based DPLL circuit with excellent wander and jitter performance and fast frequency acquisition  
Some embodiments of the present invention may include a DPLL circuit comprising a firmware. The firmware may comprise a re-sampled NCO phase detector capable of receiving a reference clock timing...
8098104 Estimation and compensation of oscillator nonlinearities  
A device may include an oscillator circuit, a control circuit, a frequency detector circuit, and a processor circuit. The oscillator circuit may include a frequency control input to output an...
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...
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...
8059778 Automatic clock frequency acquisition  
A system and method are provided for automatically acquiring a serial data stream clock. The method receives a serial data stream with an unknown clock frequency and coarsely determines the clock...
8036318 Clock and data recovery circuit  
The phase detector compares the phases of a synchronous clock signal and serial data and outputs a phase error signal corresponding to a comparison result. The second integrator performs...
8027423 Synchronizing apparatus, synchronizing method, synchronizing program and data reproduction apparatus  
A synchronizing apparatus, which controls, by a PLL circuit, a sampling clock to be used to sample input data and synchronizes a phase of the sampling clock with a target phase that is desirable...
8014724 System and method for signal limiting  
Methods and systems for processing a signal with a corresponding noise profile are disclosed. Aspects of the method may comprise analyzing spectral content of the noise profile. At least one noise...
7990224 Dual reference phase tracking phase-locked loop  
A phase-locked loop circuit having a dual-reference input and a phase detector. The dual-reference input is configured to accept both a rising edge of an input clock having a first phase and a...
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...
7978012 Dual PLL loop for phase noise filtering  
System for filtering an input frequency to produce an output frequency having low phase noise. A first PLL includes, in the feedback path, a frequency translation circuit which translates a...
7965115 Soft reference switch for phase locked loop  
A phase locked loop includes a digital controlled oscillator and a number of phase detectors, each having a first input connected to a reference source and a second input coupled to the output of...
7940130 Frequency generator and method of frequency generation with multiple sampling phase detectors  
A device includes: a plurality of sampling phase detectors, each receiving a sampling signal and a VCO output signal and in response thereto outputting a beat signal representing a frequency and...
7936222 Phase-locked loop circuit employing capacitance multiplication  
A phase-locked loop circuit. The phase-locked loop circuit comprises a phase detector, a proportional charge pump, a decimator, an integral charge pimp, and a voltage-controlled oscillator. The...
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...
7930120 System and circuit for determining data signal jitter via asynchronous sampling  
A system and circuit for determining data signal jitter via asynchronous sampling provides a low cost and production-integrable mechanism for measuring data signal jitter. The data signal is...
7917795 Digital circuit to measure and/or correct duty cycles  
A method, an apparatus, and a computer program are provided to measure and/or correct duty cycles. Duty cycles of various signals, specifically clocking signals, are important. However, measurement...
7904045 Phase detector comprising a switch configured to select a phase offset closest to a phase of an amplifier  
A phase detector includes a plurality of phase detectors located in a phase correction loop, each phase detector configured to receive as input a radio frequency (RF) input signal and an RF...
7898343 Frequency-locked loop calibration of a phase-locked loop gain  
The present invention relates to a calibrated phase-locked loop (PLL), which has a calibration mode for measuring a tuning gain of a variable frequency oscillator (VFO) and a PLL mode for normal...
7872536 Variance correction method, PLL circuit and semiconductor integrated circuit  
A variance correction method includes generating a reference current depending on a resistance within a lowpass filter and outputting the reference current to a voltage controlled oscillator, and...
7860203 High-speed serial data signal interface architectures for programmable logic devices  
A programmable logic device integrated circuit (“PLD”) includes high-speed serial interface (“HSSI”) circuitry in addition to programmable logic circuitry. The HSSI circuitry includes multipl...
7839222 Systems and methods using programmable fixed frequency digitally controlled oscillators for multirate low jitter frequency synthesis  
The disclosure provides systems and methods for programmable fixed frequency digitally controlled oscillators for multirate low jitter frequency synthesis. The present invention utilizes a digital...
7839220 Phase-locked loop runaway detector  
In a circuit having a runaway detector coupled to a phase-locked loop (PLL), the PLL may include a loop filter to receive a control voltage within the PLL and provide a filtered control voltage and...
7825737 Apparatus for low-jitter frequency and phase locked loop and associated methods  
A frequency phase locked loop (FPLL) includes a first feedback loop coupled to a second feedback loop. The first feedback loop is configured to correct a phase offset of an output signal of the...
7821345 Calibrating an oscillator and corresponding calibration device  
A method of calibrating an oscillator in order to compensate the dispersions generated, on the one hand, during the process of fabricating the oscillator circuit components and, on the other hand,...
RE41847 Sensor provided with adjusting function  
An object of the present invention is to provide an automatic compensation sensor that can eliminate an exclusive input terminal for the compensation mode signal. To achieve this object, the...
7792649 System and circuit for constructing a synchronous signal diagram from asynchronously sampled data  
A system and circuit for constructing a synchronous signal diagram from asynchronous sampled data provides a low cost and production-integrable technique for providing a signal diagram. The data...
7782144 Active filter in PLL circuit  
A low pass filter can be built in a chip by reducing the value of circuit element forming a low pass filter in a PLL circuit, especially by reducing the value of a electrostatic capacity. An active...
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...
7772928 Arrangement for phase synchronization according to the master/slave principle  
An apparatus for the phase synchronization of several devices, wherein one device is the master device and the other devices are slave devices, with a phase synchronization unit for every device,...
7764088 Frequency detection circuit and detection method for clock data recovery circuit  
A frequency detection circuit and a detection method thereof suitable for a clock data recovery (CDR) circuit are provided. The frequency detection circuit includes a phase detector, a first...
7764129 Phase-lock loop startup circuit and voltage controlled oscillator reference generator  
A method of startup for a phase-locked loop (PLL) can include, at initiation of the PLL, providing a reference voltage from a startup voltage source to an input of a voltage controlled oscillator...
7759991 Scannable virtual rail ring oscillator circuit and system for measuring variations in device characteristics  
A scannable virtual rail ring oscillator circuit and system for measuring variations in device characteristics provides the ability to study random device characteristic variation as well as...
7750685 Frequency measurement based frequency locked loop synthesizer  
A first embodiment of the present invention relates to a frequency and phase locked loop (FPLL) synthesizer having a frequency-locked loop (FLL) operating mode and a phase-locked loop (PLL)...
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...
7746181 Circuit and method for extending the usable frequency range of a phase locked loop (PLL)  
An improved circuit and method is described herein for extending the usable frequency range of a high performance, narrow band phase locked loop (PLL) device. For example, the improved circuit and...
7746182 Systems and methods for voltage controlled oscillator calibration  
Various systems, methods and apparatus for calibrating a clock generating circuit are discussed herein. As one example, a method for calibrating a voltage controlled oscillator is disclosed. The...
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...
7728675 Fast lock circuit for a phase lock loop  
A fast lock circuit for phase lock loop comprising a frequency detector, a phase frequency detector, a logic unit and a corresponding charge pump for the frequency and the phase frequency...
7724093 Phase locked loop with two-step control  
A phase locked loop has a digitally controlled oscillator (DCO) for generating a DCO output signal (fOSC), a clock divider coupled to the DCO and receiving the DCO output signal and outputting a...
7719370 Voltage controlled oscillator  
A voltage controlled oscillator that is a differential ring oscillator type voltage controlled oscillator that, by connecting in cascade differential delay elements to which differential clock...
7720189 System and method for automatic clock frequency acquisition  
A system and method are provided for automatically acquiring a serial data stream clock. The method receives a serial data stream with an unknown clock frequency and coarsely determines the clock...
7714668 Phase locked loop circuit and wireless communication system  
In a PLL circuit including a VCO having a plurality of oscillation frequency bands, a TDC circuit calculates a phase difference between a predetermined reference signal from a fixed frequency...
7714667 Programmable linear trimming method and system for phase locked loop circuit calibration  
The present invention implements an apparatus for calibrating a phase locked loop (PLL) circuit. The apparatus includes a detector for detecting frequencies of a reference signal and a controlled...
7710205 Capacitor detection by phase shift  
A method and apparatus for detecting capacitive devices are disclosed. A circuit including two circuit paths is connected to an oscillator voltage source. Connecting a test capacitive device to a...
RE41235 Phase locked loop circuit  
A PLL circuit comprises a frequency comparator for detecting a phase difference based on a difference in frequencies between a reproduced data pulse and a clock generated by a VCO; a phase...
Matches 1 - 50 out of 560 1 2 3 4 5 6 7 8 9 10 11 12 >