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| Number | Title | Issue Date |
| 8093958 | Clock, frequency reference, and other reference signal generator with a controlled quality factor Exemplary embodiments of the invention provide a reference signal generator having a controlled quality (“Q”) factor. An exemplary apparatus to generate a harmonic reference signal includes a reference resonator, such as an LC-tank, which generates a first refer... | 01/10/2012 |
| 7839230 | PLL oscillation circuit, polar transmitting circuit, and communication device Provided is a PLL oscillation circuit that can reduce the variability of modulation sensitivity of a VCO 101 and obtain a desired output amplitude quickly with high precision. An amplitude detector 103 detects an output amplitude of the VCO 101.... | 11/23/2010 |
| 7508281 | Frequency synthesizer Disclosed is a frequency synthesizer capable of preventing occurrence of a frequency shift upon occurrence of a change in the level of an input to an A/D converter by preventing PLL control from being properly operated. The frequency synthesizer includes a carrier r... | 03/24/2009 |
| 7449972 | Voltage controlled oscillator with anti supply voltage variation and/or process variation A voltage controlled oscillator with anti supply voltage variation and/or process variation includes an oscillation circuit for outputting an oscillatory signal; a current source coupled to the oscillation circuit for providing an input current to the oscillation ci... | 11/11/2008 |
| 7414486 | Device and method for power calibration of an oscillator It is therefore the object of the present invention to disclose a device for power calibration of an oscillator in the high-frequency range, which has a reduced number of components and/or has less-expensive components. A method for power calibration of an oscillato... | 08/19/2008 |
| 7382206 | Voltage controlled oscillator with body of transistors bias control In a voltage controlled oscillator, a resonant circuit generates a resonant frequency in response to a tuning voltage. A differential oscillator includes first and second transistors differentially cross-coupled to the resonant circuit. The first and second transist... | 06/03/2008 |
| 7324561 | Systems and methods for generating an output oscillation signal with low jitter A circuit for generating an output oscillation signal with low jitter includes an oscillator to generate an oscillation signal at an initial frequency based upon a control input to vary an amplitude of the oscillation signal. A first frequency multiplier multiplies ... | 01/29/2008 |
| 7289003 | Method and apparatus for amplitude control using dynamic biasing in a voltage controlled oscillator A method, circuit, and/or system for controlling an amplitude and/or limiting or reducing the energy consumed by an LC voltage controlled oscillator (LCVCO). In one embodiment, an oscillator can include: (i) a bias circuit that can provide first and second bias sign... | 10/30/2007 |
| 7271675 | Automatic gain control circuit and method and super-regenerative RF receiver An automatic gain control (AGC) circuit is applied to control a margin voltage of an oscillator. The margin voltage is the voltage difference between a high-level output and a low-level output of the oscillator. The AGC circuit of the present invention includes a co... | 09/18/2007 |
| 7262671 | Amplitude level control circuit Amplitude level control circuit for an oscillator comprising first means arranged to generate a first current for driving the oscillator; and second means arranged to generate a second current such that in direct current conditions the second current is arranged to ... | 08/28/2007 |
| 7236063 | Broadband modulation PLL, and modulation factor adjustment method thereof A problem of the present invention is to provide a wide band modulation PLL having good modulation accuracy at low cost. With respect to a PLL having a VCO (21), a frequency divider (22), a phase comparator (23), a charge pump (24) and a ... | 06/26/2007 |
| 7187245 | Amplitude control for crystal oscillator Circuits and methods for controlling the amplitude of oscillation of a crystal. In one example, a circuit may include a peak detector; a first voltage-to-current converter; a first current-to-voltage converter coupled with the first voltage-to-current converter; a s... | 03/06/2007 |
| 7181018 | 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 recovers a pilot... | 02/20/2007 |
| 7161435 | Feedback control circuit The output amplitude of a variable gain amplifier is compared with a reference value by a differential amplifier. When the amplitude is less than the reference value, the gain of the variable gain amplifier is increased to augment the output amplitude. When the ampl... | 01/09/2007 |
| 7142069 | Method and circuit arrangement for amplitude regulation of an oscillator signal A circuit arrangement for controlling an amplitude of an oscillator signal is accomplished by comparing the oscillator signal to reference signals. The amplitude of the oscillator signal is capable of being adjusted by means of a control signal. The control signal i... | 11/28/2006 |
| 7129796 | Oscillator circuit with supporting transistor for voltage sweep The ring oscillator circuit with the current mirror type current limit circuit of this invention prevents the malfunction and the halt of the ring oscillator. The ring oscillator is configured with the serially connected CMOS inverters INV1–INV5 wher... | 10/31/2006 |
| 7126435 | Voltage controlled oscillator amplitude control circuit A voltage controlled oscillator amplitude control circuit has a voltage controlled oscillator circuit to output an oscillating signal having a controlled amplitude. It also has a control circuit to control the amplitude of the oscillating signal by providing a domin... | 10/24/2006 |
| 7119628 | Adaptively extending tunable range of frequency in a closed loop A semiconductor device or a circuit includes a controllable oscillator and circuitry that senses a voltage which may control the controllable oscillator and digitally controls a gain compensation, adaptively compensating for a drop in a gain against overall loop gai... | 10/10/2006 |
| 7098753 | Oscillator with variable reference A circuit for varying an amplitude of an oscillation signal comprises an oscillator, signal processing circuitry, a first feedback circuit, and a second feedback circuit. The oscillator generates the oscillation signal and has a control input to vary the amplitude o... | 08/29/2006 |
| 7057468 | Crystal oscillator circuit with activation control A CMOS Pierce crystal oscillator. A clock generator with activation control, for generating a clock signal. The clock generator comprises an amplifier, a shaping circuit and a diagnostic circuit. The amplifier is capable of being coupled to an external oscillation s... | 06/06/2006 |
| 7012468 | Circuit configuration and method for reducing the 1/f noise of MOSFETs The circuit configuration and the associated method allow reducing the 1/f noise of MOSFETs in an electronic circuit, especially in an integrated circuit with one or more MOSFETs. At least one direct current and/or at least one direct voltage source for adjusting co... | 03/14/2006 |
| 6985045 | Gain control circuits for voltage controlled oscillators A gain controlled voltage controlled oscillator. A current controlled oscillator is adapted to provide an output signal oscillating at a frequency controllable by controlling a current applied thereto. A first current source provides a first control current controll... | 01/10/2006 |
| 6946923 | Wide range crystal oscillator A structure and associated method to allow an oscillator circuit to operate with a plurality of different crystals. The oscillator circuit comprises a semiconductor device and a crystal. The semiconductor device comprises a primary inverting amplifier and a crystal ... | 09/20/2005 |
| 6943636 | Oscillator for SERDES An LC voltage controlled oscillator for use in a SERDES. The oscillator comprises a pair of cross coupled field effect transistors coupled with a pair of multi-layer inductors. ... | 09/13/2005 |
| 6911873 | Detection circuit and method for an oscillator A method and circuit are disclosed for detecting the performance of an oscillator circuit. In particular, the circuit may detect a signal, such as the output of the oscillator circuit, failing to oscillate as desired. The second circuit may be capable of detecting w... | 06/28/2005 |
| 6906596 | Oscillation circuit and a communication semiconductor integrated circuit A voltage controlled LC resonance oscillation circuit has a plurality of capacitive elements connected to an output node. These capacitive elements are applied with voltages at opposing terminals for selecting an oscillating frequency band, so that the oscillating f... | 06/14/2005 |
| 6825736 | Method and apparatus for controlling a voltage controlled oscillator A level detector (110, 104) and corresponding method detects (602) whether an output signal level of a VCO (102) is within a window bounded by minimum and maximum thresholds. When the output signal level is not within the window, a loop-control ... | 11/30/2004 |
| 6816024 | Oscillator circuit with switchable compensated amplifiers An oscillator circuit is specified, having an LC resonator, to which two or more current paths are connected, which are connected in parallel with one another and can be connected and disconnected individually by switches. The attenuation compensation amplifiers are... | 11/09/2004 |
| 6784757 | High quality parallel resonance oscillator A highly stable single chip resonator controlled oscillator with automatic amplitude control and biasing is designed for manufacture with monolithic integrated circuit technologies. Analog and digital output buffers with elaborate control for power saving purposes a... | 08/31/2004 |
| 6714091 | VCO with programmable output power Voltage controlled oscillator assembly which includes at least one voltage controlled oscillator, and a regulator for regulating the output power from the at least one voltage controlled oscillator. ... | 03/30/2004 |
| 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 |
| 6657507 | Active on-die integrated resistance circuit for real time clock (RTC) oscillators An oscillator circuit including an integrated circuit amplifier, an integrated circuit active resistance circuit to set the gain of the amplifier, a crystal resonator to set the frequency of the signal generated by the oscillator circuit, and a pair of ca... | 12/02/2003 |
| 6653908 | Oscillator circuit with automatic level control for selectively minimizing phase noise An oscillator with oscillator and voltage control circuitry for generating an oscillation signal having an amplitude that is automatically controlled for a selectively minimized phase noise. Automatic level control is used for controlling the amplitude of... | 11/25/2003 |
| 6611177 | Voltage controlled oscillator including fluctuation transmitter for transmitting potential fluctuation by noise A voltage controlled oscillator includes an oscillation controller, first and second current sources, oscillation section, and first and second fluctuation transmitters. The oscillation controller generates first and second control potentials. The first a... | 08/26/2003 |
| 6577204 | Electronic circuit supplied with power via current generator means In an electronic circuit supplied from supply terminals, a terminal in the circuit being biased to a voltage between the supply terminal voltages, connections from power supply terminals are made via current generator means. The circuit is preferably an R... | 06/10/2003 |
| 6518846 | Voltage controlled oscillator with voltage regulation In a voltage controlled oscillator (VCO) having a voltage-current conversion circuit, a ring oscillator, and a main power supply for feeding a power supply voltage to these components, it is constructed so that a voltage which is fed to the voltage-curren... | 02/11/2003 |
| 6483391 | System for controlling the amplitude of an oscillator Systems for controlling the amplitude of the output signal of a controllable oscillator in a frequency synthesizer are provided. One such system provides a circuit having a controllable oscillator and an amplitude control circuit. The controllable oscilla... | 11/19/2002 |
| 6469587 | Differential LC voltage-controlled oscillator A differential voltage-controlled oscillator (VCO) employs a pair of accumulation-mode varactors driven with a differential control voltage to generate a differential oscillating waveform. The differential control voltage is formed from a pair of level-sh... | 10/22/2002 |
| 6329884 | Oscillator circuit with current limiting devices There is disclosed an oscillator circuit in which the first capacitor is connected between the input side of a CMOS inverter in a quartz oscillator circuit and a higher potential side, the second load capacitor is connected between the input side of the i... | 12/11/2001 |
| 6154097 | PLL oscillating circuit including oscillating circuit with mutual conductance controlled A phase locked loop (PLL) oscillating circuit includes a first oscillating circuit, a lock detector and a reference oscillating circuit. The first oscillating circuit generates an oscillation signal with a first frequency, and controls the first frequency... | 11/28/2000 |
