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| Number | Title | Issue Date |
| 7863989 | Replica-bias automatic gain control A gain control system comprises a reference stage, a bias replication stage, an operational amplifier, an automatic gain control block, a gain stage, and a crystal oscillator in one embodiment. A negative feedback loop is formed by portions of the operational amplif... | 01/04/2011 |
| 7855606 | Oscillator device An oscillator device having an oscillation system including an oscillator and a resilient supporting member, a driving member configured to supply a driving force to the oscillation system based on a driving signal, a detecting member configured to detect at least a... | 12/21/2010 |
| 7583151 | VCO amplitude control Disclosed are circuits and methods to control the amplitude of a signal generated by a VCO. ... | 09/01/2009 |
| 7425852 | Phase-locked loop The present invention relates to a phase-locked loop for frequency synthesis, which has a memory for a control value for the controllable oscillator of the phase-locked loop, which is connectable via a first switch to the control input of the controllable oscillator... | 09/16/2008 |
| 7400210 | Voltage controlled oscillator, PLL circuit, pulse modulation signal generating circuit, semiconductor laser modulation device and image forming apparatus An oscillation frequency control part includes a voltage-to-current converting circuit converting an input voltage to a current having a value corresponding to the input voltage, and outputting a current in proportion to the current obtained from the voltage-to-curr... | 07/15/2008 |
| 7398071 | Loop filter with gear shift for improved fractional-N PLL settling time An integrated circuit radio frequency (RF) transmitter includes a phase locked loop having a multi-mode loop filter that is operable to provide wide band response with a fast settle time in a startup mode of operation and a relatively more narrow response with a lon... | 07/08/2008 |
| 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 and receiving through at least one spurious path a harmonic component ... | 05/13/2008 |
| 7355485 | 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 capacitors that can be switched-in or switched-out of the LC circuit acc... | 04/08/2008 |
| 7353011 | Method and apparatus for operating a PLL for synthesizing high-frequency signals for wireless communications A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitanc... | 04/01/2008 |
| 7323943 | PLL circuit with deadlock detection circuit Disclosed is a PLL circuit including a deadlock detection circuit includes a counter circuit for counting a clock signal. In a deadlock state, the deadlock detection circuit outputs a deadlock detection signal responsive to an output signal from the counter circuit ... | 01/29/2008 |
| 7301409 | Oscillator In the current-controlled oscillator performing an oscillation frequency control by using a differential amplifier circuit, resistors are inserted to each current path of a differential pair of the differential amplifier circuit, and thereby an inclination of output... | 11/27/2007 |
| 7295049 | Method and circuit for rapid alignment of signals Circuits and methods for aligning two or more signals including a first and second signal. In one embodiment, a shift register generates two or more shifted copies of the second signal, and each of a plurality of phase detectors receives the first signal and one of ... | 11/13/2007 |
| 7265633 | Open loop bandwidth test architecture and method for phase locked loop (PLL) A phase locked loop (PLL) can include a test loop filter (100) that generates a control voltage (VCTRL) for input to a voltage controlled oscillator (VCO). In a test mode, a control voltage can be varied and resulting output frequencies recorded, f... | 09/04/2007 |
| 7230997 | Semiconductor integrated circuit for communication, radio-communications apparatus, and transmission starting method In a polar loop based radio-communications apparatus having a phase control loop for controlling the phase of a carrier outputted from an oscillator for transmission, and an amplitude control loop for controlling the amplitude of a transmission output signal outputt... | 06/12/2007 |
| 7132899 | Method and apparatus for providing an improved high speed buffer A method and apparatus for providing a high speed buffer with high gain bandwidth and rail-to-rail operation is disclosed. Resistor-capacitor (RC) filters are added in current mirrors that are in the signal path. The effect of these filters is to create a frequency-... | 11/07/2006 |
| 7078946 | Analog PLL with switched capacitor resampling filter A resampler filter for use in an analog phase-locked loop has a charge pump and one or more switched capacitors switched by signals derived from a voltage controlled oscillator in the phase locked loop. ... | 07/18/2006 |
| 7053721 | Oscillator having a resonant circuit and a drive circuit An oscillator includes a resonant circuit generating a resonant signal, a drive circuit that feeds back the resonant signal to the resonant circuit, and an output terminal connected to a given node of the resonant circuit, an oscillation signal of the oscillator bei... | 05/30/2006 |
| 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 given output frequency using a controlled oscillator having a freque... | 05/30/2006 |
| 6993307 | Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitanc... | 01/31/2006 |
| 6969984 | Direct phase and frequency demodulation The present invention, generally speaking, provides a time shift angle demodulator that is of simple construction and has an extended linear range. Range extension is achieved by using the input signals directly, not simply post-processing the S-PFD outputs. In acco... | 11/29/2005 |
| 6965502 | System, device and method for providing voltage regulation to a microelectronic device The present invention provides a power regulation system and method with high speed signal settling capabilities for providing rapid active transient response to a microelectronic device. An active transient response system includes a power supply configured to rece... | 11/15/2005 |
| 6965761 | Controlled oscillator circuitry for synthesizing high-frequency signals and associated method A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitanc... | 11/15/2005 |
| 6947514 | Phase-locked loop circuit, information processing apparatus, and information processing system A phase locked loop (PLL) circuit is provided to operate in a broad band, including two separate loops one of which is for feed-back of an output from an oscillator to the same oscillator through its associative proportional control unit and the other of which is fo... | 09/20/2005 |
| 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 first input of the phase detector; a slave oscillator having an output op... | 06/21/2005 |
| 6903617 | Method and apparatus for synthesizing high-frequency signals for wireless communications A semiconductor package includes a package substrate and an integrated circuit. The package substrate has a first surface. The integrated circuit couples electrically to the first surface of the package substrate. The integrated circuit and the package substrate tog... | 06/07/2005 |
| 6791906 | Method and system for fail-safe control of a frequency synthesizer In a preferred embodiment, the invention provides a method and system for allowing a frequency synthesizer to function despite long delays. A first and second phase comparator, each with at least three inputs and an output are preset to a predetermined logical value... | 09/14/2004 |
| 6741136 | Circuit for preventing system malfunction in semiconductor memory and method thereof A circuit for preventing a system malfunction in a semiconductor memory includes an oscillating circuit generating an oscillating clock signal by receiving an oscillating signal, a system clock generator generating a system clock signal by receiving the oscillating ... | 05/25/2004 |
| 6694026 | Digital stereo recovery circuitry and method for radio receivers Stereo recovery circuitry for a digital receiver is disclosed that provides increased accuracy and efficiency in recovering stereo signal information from transmitted stereo signals. The stereo decoder includes a digitally controlled oscillator that recov... | 02/17/2004 |
| 6545548 | Fractional synthesizer comprising a phase jitter compensation The multiple fractional division frequency synthesizer includes a frequency generator, a voltage-controlled oscillator, a programmable variable N-divider, a phase comparator, an integration and filter circuit, a time window generator, a weighted current s... | 04/08/2003 |
| 6479978 | High-resolution measurement of phase shifts in high frequency phase modulators A phase difference to duty-cycle circuit converts a phase shifted signal and a reference signal into a single signal having a duty cycle that is a function of the phase difference between the two signals. The single signal may be further converted to a si... | 11/12/2002 |
| 6437616 | Delay lock loop with wide frequency range capability A delay lock loop circuit is disclosed which includes a delay block which receives the clock signal and delays the clock signal by a selected amount to generate the delayed clock signal. A phase detector receives the clock signal and the delayed clock sig... | 08/20/2002 |
| 6424230 | Loop stabilization technique in a phase locked loop (PLL) with amplitude compensation A phase locked loop circuit and method that substantially decouples control of the phase/frequency and the amplitude of the oscillation output such that the frequency of the oscillation can be controlled independently of the amplitude. The phase locked lo... | 07/23/2002 |
| 6388531 | Voltage controlled oscillator with reduced parasitic interference A phase locked loop for a voltage controlled oscillator includes a phase comparator receiving at its inputs a reference frequency signal and a frequency signal from the oscillator, and supplies logic values to command a charge pump. A charge re-injection ... | 05/14/2002 |
| 6369660 | Circuit and method for preventing runaway in a phase lock loop A circuit and/or method comprising an oscillator circuit, a pulse detection circuit and a control circuit. The oscillator circuit may be configured to generate an output signal having a frequency in response to (i) a first control signal and (ii) a second... | 04/09/2002 |
| 6317476 | Suppressing channel-dependent spurious signals in fractional-N synthesizer A device for suppressing spurious signals generated by a fractional-N synthesizer. The fractional-N synthesizer generates an output frequency where an underlying PLL circuit uses a frequency divider for dividing the output frequency by a frequency-divisio... | 11/13/2001 |
| 6160444 | Demodulation of FM audio carrier A method of demodulating an FM carrier wave and an FM demodulation circuit are described which use a phase locked loop. The phase locked loop is tuned to a selected carrier wave frequency including the step of selecting a setting of the variable gain circ... | 12/12/2000 |
| 5787124 | Quadrature detector and amplitude error correction method for quadrature detector A method for correcting an amplitude error between an I signal and a Q signal which are outputted from a quadrature detector including a first multiplier for multiplying a reference signal and a measured signal, a first integrator for smoothing the output... | 07/28/1998 |
| 5631601 | FM demodulation with a variable gain phase locked loop A method of demodulating an FM carrier wave and an FM demodulation circuit are described which use a phase locked loop. An FM input signal including the carrier wave is supplied to a phase detector in the phase locked loop. The output of the phase detecto... | 05/20/1997 |
| 5563811 | Microprocessor controlled drive circuit for a liquid nebulizer having a plurality of oscillators A circuit for causing an element to produce a substantially linear response to an input signal comprising an element for providing a response, a transistor oscillator circuit for providing an electrical output signal of variable amplitude to excite the el... | 10/08/1996 |
| 5539357 | Phase locked loop PLL apparatus for generating an oscillatory signal phase locked to a component of a further signal comprises a variable oscillator for generating the oscillatory signal and a source of the further signal. A phase detector responsive to the oscillatory sig... | 07/23/1996 |
