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| Number | Title | Issue Date |
| 8143963 | Voltage source circuit for crystal oscillation circuit A voltage source circuit for a crystal oscillation circuit is provided, in which the voltage source circuit and the crystal oscillation circuit are formed with the same process. The voltage source circuit includes a current source, a first PMOS, a first NMOS and a r... | 03/27/2012 |
| 8138847 | Temperature and/or voltage independent voltage controlled oscillator with programmable gain and/or output frequency range An apparatus comprising a transconductance control circuit, a boost control circuit, a current computation circuit and an oscillator circuit. The transconductance control circuit may be configured to generate a current control signal in response to (i) a voltage con... | 03/20/2012 |
| 8081040 | Method and apparatus for oscillating Aspects of the disclosure provide a voltage controlled oscillator. The voltage controlled oscillator can include a plurality of oscillation stages coupled together to generate an oscillation signal having an oscillation frequency. At least one oscillation stage of t... | 12/20/2011 |
| 8031027 | Voltage-controlled oscillator, phase-locked loop (PLL) circuit, and clock generator A voltage-controlled oscillator includes a voltage regulator, and a delay unit. The voltage regulator independently receives a first oscillation control signal and a second oscillation control signal to provide a regulated voltage signal which is represented by a re... | 10/04/2011 |
| 7982553 | Clock generator This invention discloses a clock generator capable of automatically adjusting output clock when process, voltage, or temperature variation occurred. The clock generator comprises a current generator, for generating a first current and a second current according to a... | 07/19/2011 |
| 7973612 | Supply-regulated phase-locked loop (PLL) and method of using A supply-regulated Phase-locked loop (PLL) is provided. The PLL comprises a supply-regulating loop, a voltage-controlled oscillator (VCO), and a programmable decoupling capacitor array for the VCO. The capacitance of the VCO decoupling capacitor array is adjustable ... | 07/05/2011 |
| 7961060 | Amplitude regulated resonant oscillator with sampled feedback Disclosed is an oscillator circuit, comprising a crystal oscillator, an amplifier having an input and an output coupled across the crystal oscillator, a comparator having a reference input and an input coupled to the crystal oscillator and a pole network coupled bet... | 06/14/2011 |
| 7948330 | Current controlled oscillator with regulated symmetric loads An integrated circuit incorporating a bias circuit for a current-controlled oscillator (ICO) with improved power supply rejection ratio (PSRR) is described. The bias circuit for the ICO includes two error amplifiers. The first error amplifier regulates the bias volt... | 05/24/2011 |
| 7902936 | Method and apparatus for generating oscillating signals An apparatus for generating an oscillating signal that includes a circuit to accelerate the time in which an oscillating signal reaches a defined steady-state condition from a cold start. The apparatus includes an oscillating circuit to generate an oscillating signa... | 03/08/2011 |
| 7880554 | Periodic timing jitter reduction in oscillatory systems A device including a voltage regulator with an adaptive switching frequency circuit for noise-sensitive analog circuits, such as oscillatory systems with phase-lock loops (PLLs) and voltage-controlled oscillators (VCOs) is described. In an exemplary embodiment, the ... | 02/01/2011 |
| 7782153 | Timing adjusting method and timing adjusting apparatus A timing adjusting method detects a phase error between a main signal path from which a transmitting signal is obtained and a control signal path from which a voltage control signal is obtained, based on a to-be-amplified signal that is to be amplified and represent... | 08/24/2010 |
| 7724104 | Constant gain amplifier system with positive and negative feedback Constant and accurate signal gain systems based on controlling oscillator loop gain. A constant gain positive feedback network and an amplifier form an oscillator. Only when the oscillator loop gain is at least one does the oscillator produces an AC signal. Negative... | 05/25/2010 |
| 7683730 | Differential crystal oscillator circuit with peak regulation A clock circuit has a crystal. A differential amplifier has a first input coupled to a first node of the crystal and a second input of the differential amplifier coupled to a bias signal and an output of the differential amplifier coupled to a second node of the cry... | 03/23/2010 |
| 7663447 | Oscillator circuit having a stable output signal resistant to power supply voltage fluctuation A stable frequency is outputted by an oscillator circuit including a constant current circuit which is electrically connected between a first terminal and a second terminal, a voltage controlled oscillator circuit in which an oscillation frequency fluctuates in acco... | 02/16/2010 |
| 7616075 | Phase locked loop circuit having regulator Embodiments of present invention provide a circuit including a voltage regulator, a phase frequency detector, a charge pump, a low pass filter a control-voltage generating circuit and a voltage controlled oscillator. In a first mode of operation the voltage controll... | 11/10/2009 |
| 7602260 | Programmable supply voltage regulator for oscillator A circuit comprises a programmable voltage regulator and an oscillator. The programmable regulator generates a regulated supply voltage using an input voltage and changes the regulated supply voltage from a first voltage to a second voltage in response to a first co... | 10/13/2009 |
| 7592878 | Method and apparatus for generating oscillating signals An apparatus for generating an oscillating signal that includes a circuit to accelerate the time in which an oscillating signal reaches a defined steady-state condition from a cold start. The apparatus includes an oscillating circuit to generate an oscillating signa... | 09/22/2009 |
| 7486154 | Flicker noise degeneration technique for VCO An oscillating circuit having improved noise degeneration includes an oscillator and a noise degeneration circuit. The oscillator is adapted to provide a differential oscillating signal between first and second output terminals, and includes first and second transis... | 02/03/2009 |
| 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 |
| 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 |
| 7391277 | Interleaved voltage controlled oscillator An interleaved voltage-controlled oscillator (VCO) is disclosed. The VCO includes a ring circuit comprising a series connection of main logic inverter gates, a plurality of delay elements connected in parallel with a selected sequence of the main logic inverter gate... | 06/24/2008 |
| 7388447 | Integrated clock generator tolerant to device parameter variation A method and circuit for stabilizing a frequency of a clock generator comprising a ring oscillator with respect to manufacturing process variations and a circuit temperature. A bias circuit comprising a current mirror and cascade circuits provides a compensated bias... | 06/17/2008 |
| 7382207 | Oscillator circuit suppressing variation of oscillation frequency An oscillator circuit includes: oscillating transistors; a resonance circuit that includes varactor diodes each having a cathode to which a control voltage for controlling an oscillation frequency is applied and that is coupled between a collector and a base of each... | 06/03/2008 |
| 7369009 | Oscillator device for frequency modulation The present invention pertains to an oscillator arrangement for carrying out a frequency modulation process, wherein an oscillator (1) with automatic amplitude control (5, 6, 7) is provided. The shift keying is not realized with reconnectable capacitan... | 05/06/2008 |
| 7355435 | On-chip detection of power supply vulnerabilities On-chip sensor to detect power supply vulnerabilities. The on-chip sensor employs a sensitive delay chain and an insensitive delay chain to detect power supply undershoots and overshoots without requiring external off-chip components. Undershoots and overshoots outs... | 04/08/2008 |
| 7352249 | Phase-locked loop bandwidth calibration circuit and method thereof A phase-locked loop frequency synthesizer has a charge pump, phase-locked loop filter, voltage-controlled oscillator, and a bandwidth calibration circuit. The bandwidth calibration circuit measures the gain of the voltage-controlled oscillator and uses the measured ... | 04/01/2008 |
| 7342465 | Voltage-controlled oscillator with stable gain over a wide frequency range An apparatus and method for providing a stable gain over wide frequency range in a VCO are presented. A VCO uses a waveform generator along with a bias generator having a frequency select input. The frequency select input is used to adjust the amount of output curre... | 03/11/2008 |
| 7336138 | Embedded structure circuit for VCO and regulator An oscillation circuit formed in a single semiconductor chip, wherein a first source voltage is supplied to a first power supply terminal, a second source voltage different from the first source voltage is supplied to a second power supply terminal, a voltage regula... | 02/26/2008 |
| 7330081 | Digitally controlled oscillator and associated method A digitally controlled oscillator circuit is provided that comprises a ring oscillator including multiple inverters; multiple digitally controlled capacitors (DCCs), each coupled to apply a digitally controllable amount of capacitance to an output of a different one... | 02/12/2008 |
| 7330080 | Ring based impedance control of an output driver One embodiment in accordance with the invention is a method that can include utilizing a ring oscillator module to determine a process corner of an integrated circuit as fabricated that includes the ring oscillator module. The impedance of an output driver of the in... | 02/12/2008 |
| 7319358 | Method and apparatus for generating an adaptive power supply voltage In a method and apparatus for generating a power supply voltage, an integrated circuit including an adaptive power supply voltage circuit is provided where a target signal is generated representing an ideal or approximated ideal performance characteristic of a funct... | 01/15/2008 |
| 7315221 | Method and circuit for controlling a refresh of a semiconductor memory device A refresh control circuit includes a reference voltage generating circuit and an oscillator unit. The reference voltage generating circuit generates a reference voltage based on a variation in a drain-to-source voltage of a field effect transistor according to a tem... | 01/01/2008 |
| 7307487 | Driver device for a voltage-controlled oscillator A driver device for a voltage-controlled oscillator, having an unstable voltage source, a voltage regulator, a driver for generating a control voltage for the oscillator, and a feedback loop which controls the driver as a function of the output signal of the oscilla... | 12/11/2007 |
| 7283010 | Power supply compensated voltage and current supply An apparatus and method for providing a power supply compensated voltage or current is presented. A supply compensated current and voltage source utilizes a differential amplifier connected to a bandgap reference voltage and a scaled power supply voltage. When power... | 10/16/2007 |
| 7276984 | Oscillation circuit capable of having stable oscillation in wide temperature range An oscillation circuit includes a constant current source, a current mirror circuit configured to receive a constant input current from the constant current source and to output a current proportional to the constant input current, a first inverter configured to be ... | 10/02/2007 |
| 7274264 | Low-power-dissipation CMOS oscillator circuits with capacitively coupled frequency control Methods and apparatus are disclosed for adjusting the frequency tuning range of an oscillator circuit. The oscillator circuit is comprised of at least two MOS devices; a first reactance connecting a drain electrode of a first MOS device to a gate electrode of a seco... | 09/25/2007 |
| 7265641 | Oscillator circuit arrangement with an automation feedback control A circuit arrangement for generating oscillations with a defined frequency includes an oscillator circuit (30, 32) for generating the oscillations and a dedamping circuit (18, 20) connected to the oscillator circuit for compensating any damping of the ... | 09/04/2007 |
| 7242261 | Voltage control for clock generating circuit An apparatus is provided that includes a clock distribution network, a plurality of distributed oscillators provided about the clock distribution network so as to provide clock signals on the clock distribution network and a power control circuit to control power ap... | 07/10/2007 |
| 7236062 | Low phase noise crystal oscillator with supply noise filtering A low phase noise crystal oscillator with supply noise filtering is provided and may comprise receiving an input voltage at a positive potential input of an oscillator circuit, which may comprise an oscillator core and a buffer coupled to an output of the oscillator... | 06/26/2007 |
| 7233214 | Voltage-controlled oscillators with controlled operating range and related bias circuits and methods A voltage-controlled oscillator includes a bias circuit and a delay circuit. The bias circuit may generate a bias voltage signal pair having levels that are based on the voltage level of an input voltage signal and that are constrained by the values of a maximum cur... | 06/19/2007 |
