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| Number | Title | Issue Date |
| 8183949 | Compensation of VCO gain curve offsets using auto-calibration A method is provided for selecting an operating band of a voltage-controlled oscillator (“VCO”) of a phase locked loop (“PLL”) for which the lock frequency is closest to a center of the frequency range of the operating band. In such method, steps can be perf... | 05/22/2012 |
| 8183950 | Auto-calibration for ring oscillator VCO A phase locked loop (“PLL”) includes a voltage controlled oscillator (“VCO”) operable to acquire and maintain lock at a selected output frequency of the VCO and control logic operable to perform steps in a method of selecting a frequency band for operating t... | 05/22/2012 |
| 8169270 | Overlapping, two-segment capacitor bank for VCO frequency tuning A VCO (for example, in an FM receiver) includes an LC resonant tank. The LC resonant tank includes a coarse tuning capacitor bank and a fine tuning capacitor bank. The coarse tuning capacitor bank contains a plurality of digitally controlled coarse tuning capacitor ... | 05/01/2012 |
| 8154356 | Oscillator with capacitance array An oscillator is provided which comprises an array of capacitances. At least some capacitances in the array have different capacitance values. ... | 04/10/2012 |
| 8134419 | Digital high-frequency generator circuit A high-frequency generator circuit comprises a signal generating circuit, a delay unit, a selector, a synthesizer circuit, and a controller. The signal generating circuit generates a signal having the same frequency as an output signal. The delay unit includes a plu... | 03/13/2012 |
| 8125286 | High-resolution varactors, single-edge triggered digitally controlled oscillators, and all-digital phase-locked loops using the same A digitally controlled oscillator (DCO) includes a pulse generator for generating a pulse signal upon an edge of a trigger signal, and at least one delay circuit coupled to delay the pulse signal generated by the pulse generator. The pulse generator is coupled to re... | 02/28/2012 |
| 8004367 | VCO control and methods therefor A PLL receives an indicator indicating that it is to operate at a different operating frequency than a current operating frequency. A control word is selected from a set of linear control words based upon the different operating frequency. A capacitance of a variabl... | 08/23/2011 |
| 7940140 | Self-calibrated wide range LC tank voltage-controlled oscillator (VCO) system with expanded frequency tuning range and method for providing same The present invention is a self-calibrating, dual-band, wide range LC tank Voltage Controlled Oscillator (VCO) system. The system may include a first Voltage-Controlled Oscillator (VCO) and a second Voltage-Controlled Oscillator (VCO). The system may further include... | 05/10/2011 |
| 7928812 | Automated tuning in wide range multi-band VCO with internal reset concept Circuits and methods for automated real-time tuning of wide range frequency/delay voltage controlled oscillators (VCO) using a reset mechanism, to account for run-time variations such as power supply, temperature, reference clock frequency and input slew drift etc i... | 04/19/2011 |
| 7924110 | Monolithic clock generator and timing/frequency reference In various embodiments, the invention provides a clock generator and/or a timing and frequency reference, with multiple operating modes, such power conservation, clock, reference, and pulsed modes. The various apparatus embodiments include a resonator adapted to pro... | 04/12/2011 |
| 7868710 | Digitally-controlled crystal oscillator circuit The present invention relates to a digitally-controlled crystal oscillator (DCXO) circuit having control circuitry, an active core, and a pair of thermometer-coded switched-capacitor circuits (TCSCCs), each of which is coupled to the active core and to a crystal. Th... | 01/11/2011 |
| 7834713 | Synthesized local oscillator and method of operation thereof A method for controlling a synthesized local oscillator (SLO) includes: receiving a control input specifying a desired SLO output; receiving reference clock signal; generating a predefined set of dynamic clock signals from the reference clock signal; selecting a dyn... | 11/16/2010 |
| 7821350 | Methods and apparatus for dynamic frequency scaling of phase locked loops for microprocessors A phase-locked loop employing a plurality of oscillator complexes is disclosed. The phase-locked loop includes a clock output and a plurality of oscillator complexes operable to generate output signals. The phase-locked loop further includes control logic which is c... | 10/26/2010 |
| 7777586 | Multi-brand electronic apparatus and multi-band signal processing method A multi-band electronic apparatus and method thereof is provided. The method comprises outputting a first output signal in the first band by a first voltage controlled oscillator according to a switch control signal and a control voltage, outputting a second output ... | 08/17/2010 |
| 7772934 | Calibration of phase locked loop parameters based on static band information A technique includes selecting one out of a plurality of frequency bands and providing a voltage controlled oscillator to generate a mixing signal for the selected frequency band. The technique includes adjusting a frequency gain of the voltage controlled oscillator... | 08/10/2010 |
| 7760040 | Method of eliminating temperature induced band switching in ultra wideband voltage controlled oscillator A method and a voltage-controlled oscillator provide an output signal with a frequency within one of a plurality of frequency bands, while reducing or eliminating temperature-induced band-switching or other drifts in operating frequency. The band-switching is reduce... | 07/20/2010 |
| 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 in an inputted reference clock signal (REF). A clock counter counts ... | 07/06/2010 |
| 7737798 | Systems and methods for multi-range clock generation Various systems and methods for clock generation are disclosed herein. As just one example, a system for clock generation is disclosed that includes a phase/frequency control circuit that provides a feedback control; a multi-range selector circuit that receives the ... | 06/15/2010 |
| 7728686 | Digital-controlled oscillator for eliminating frequency discontinuities and all-digital phase-locked loop using the same A digital-controlled oscillator (DCO) is utilized in an all-digital phase-locked loop for eliminating frequency discontinuities. The DCO includes a tank module and a negative gm cell. The tank module comprises a plurality of cells, at least a portion of the cells co... | 06/01/2010 |
| 7656243 | Monolithic clock generator and timing/frequency reference In various embodiments, the invention provides a clock generator and/or a timing and frequency reference, with multiple operating modes, such power conservation, clock, reference, and pulsed modes. The various apparatus embodiments include a resonator adapted to pro... | 02/02/2010 |
| 7656245 | Integrated clock generator and timing/frequency reference In various embodiments, the invention provides a clock generator and/or a timing and frequency reference using an LC-oscillator topology, having a frequency controller to control and provide a stable resonant frequency, which is integrated with other, second circuit... | 02/02/2010 |
| 7656244 | Discrete clock generator and timing/frequency reference In various embodiments, the invention provides a discrete clock generator and/or a timing and frequency reference using an LC-oscillator topology, having a frequency controller to control and provide a stable resonant frequency, which may then be provided to other, ... | 02/02/2010 |
| 7612626 | Programmable varactor for VCO gain compensation and phase noise reduction A programmable varactor apparatus may include multiple binary weighted varactors controlled by multiple digital varactor bits. A programmable varactor apparatus may include a plurality of binary weighted varactors, and a control to selectively disable one or more of... | 11/03/2009 |
| 7609122 | Method and system for calibration of a tank circuit in a phase lock loop A phase lock loop (PLL) includes a calibration loop for calibrating a tank circuit for capacitance variation through process variations of manufacturing an integrated circuit including the PLL. A capacitance profile for setting the frequency of the PLL at a process ... | 10/27/2009 |
| 7573347 | Digitally controlled oscillator device and method for generating an oscillating signal with a digitally controlled phase locked loop A digitally controlled oscillator device includes a programming input, a selection input and an oscillator core with a first capacitive element which is frequency determining and programmable. The first capacitive element is coupled to the programming input that rec... | 08/11/2009 |
| 7548132 | Monolithic clock generator and timing/frequency reference In various embodiments, the invention provides a clock generator and/or a timing and frequency reference, with multiple operating modes, such power conservation, clock, reference, and pulsed modes. The various apparatus embodiments include a resonator adapted to pro... | 06/16/2009 |
| 7545231 | Transconductance and current modulation for resonant frequency control and selection In various embodiments, the invention provides a frequency controller and a temperature compensator for frequency control and selection in a clock generator and/or a timing and frequency reference. The various apparatus embodiments include a resonator adapted to pro... | 06/09/2009 |
| 7504903 | Communication semiconductor integrated circuit device and a wireless communication system In a communication semiconductor integrated circuit device, an oscillator of a PLL circuit can operate in a plurality of frequency bands. With a control voltage (Vc) of the oscillator fixed to a predetermined value (VDC), an oscillation frequency of the oscillator i... | 03/17/2009 |
| 7498894 | Varactor system having real or apparent low capacitance density A system in one embodiment includes a voltage controlled oscillator; at least two varactors coupled to a tank node, each of the varactors being of a different physical size, the tank node being coupled to the voltage controlled oscillator; and switches for selective... | 03/03/2009 |
| 7443259 | Fast VCO band selection by frequency to voltage converter The invention comprises a phase locked loop that has an input adapted to receive a reference frequency. A phase detector is connected directly to the input, a charge pump is connected directly to the phase detector, and a loop filter is connected directly to the cha... | 10/28/2008 |
| 7443252 | Calibration circuit and operation method for voltage-controlled oscillator A calibration circuit for voltage-controlled oscillator (VCO) includes a calibration bias generator, a VCO, a detection unit, a micro control unit, an adjuster unit, a phase-locked loop (PLL) unit, a control voltage detection unit, and a control switch set. The cali... | 10/28/2008 |
| 7423493 | Wireless communication semiconductor integrated circuit device and mobile communication system An RF IC in which a PLL circuit including a loop filter is incorporated into a semiconductor chip is achieved without increasing power consumption or chip size. The RF IC includes a VCO capable of switching oscillation frequency bands, a variable frequency divider, ... | 09/09/2008 |
| 7423495 | Oscillator and method for generating an oscillator signal An oscillator includes a first resonator circuit, a second resonator circuit coupled to the first resonator circuit and a reconfigurable network having a transconductance and coupled to at least one of the resonator circuits. Reconfiguration of the reconfigurable ne... | 09/09/2008 |
| 7417511 | Modulation circuit with integrated microelectro-mechanical system (MEMS) components A modulation circuit includes a microelectronic electromechanical system (MEMS) based resonant structure having a resonant frequency, an excitation input and an output. A control module is coupled to the excitation input of the MEMS based resonant structure. The con... | 08/26/2008 |
| 7414490 | Dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing Disclosed is a dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing. The dual-band voltage-controlled oscillator includes a power supply unit for supplying a source voltage; plural voltage-controlled oscillation units for outpu... | 08/19/2008 |
| 7411462 | Built-in self test method for a digitally controlled crystal oscillator A novel testing mechanism operative to test large capacitor arrays such as those used in a digitally controlled crystal oscillator (DCXO). The invention is adapted for use in DCXO circuits that employ dynamic element matching in their array decoding circuits. The in... | 08/12/2008 |
| 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 of the invention, the phase jitter may be mitigated by connecting ot... | 08/12/2008 |
| 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 connected to a loop filter to produce the control voltage. To provide the pha... | 08/05/2008 |
| 7405633 | Methods and apparatus for loop bandwidth control for a phase-locked loop A method for controlling loop bandwidth of a phase locked loop is described. The method includes setting the loop bandwidth to a value, calculating at least one of a phase error and a frequency change that occur subsequent to any setting or adjusting of loop bandwid... | 07/29/2008 |
| 7405627 | PLL frequency synthesizer In a PLL frequency synthesizer outputting signals with different frequencies: voltage-controlled oscillators output the signals and have the oscillation frequencies controlled according to control voltages; a first switch selects one of the signals; a frequency divi... | 07/29/2008 |
