Class / Patent application number | Description | Number of patent applications / Date published |
331182000 | AMPLITUDE CONTROL OR STABILIZATION | 12 |
20090066433 | Voltage controlled oscillator - The present invention provides a voltage controlled oscillator having a wide frequency variation range and an oscillation frequency that shows favorable linearity with respect to control voltage. The present invention includes an amplifier circuit | 03-12-2009 |
20090160570 | CLOCK SIGNAL GENERATOR - The present invention provides a clock signal generator capable of reducing current consumption and stably outputting a clock signal early. When it is discriminated that the amplitude of an amplification oscillation signal obtained by amplifying an oscillation signal produced from a crystal oscillator according to a constant current value has exceeded threshold amplitude, the clock signal generator generates a clock signal, based on the amplification oscillation signal. When it is discriminated that the total number of clock pulses of the clock signal has exceeded a predetermined pulse number, the clock signal generator reduces the constant current value. | 06-25-2009 |
20110304407 | AUTOMATIC AMPLITUDE CONTROL FOR VOLTAGE CONTROLLED OSCILLATOR - A circuit and method for calibrating a VCO (voltage controlled oscillator) is disclosed. In one embodiment, a circuit includes a VCO and a bias control circuit coupled to a tail node of the VCO. An amplitude control unit may also be coupled to the tail node, wherein the amplitude control unit is configured to determine the amplitude of a VCO output signal based on a voltage present on the tail node. The amplitude control unit may also be configured to generate a bias voltage based on the amplitude of the VCO output signal and a target voltage. The bias control circuit may be coupled to receive the bias voltage from the amplitude control unit and may be further configured to adjust the voltage on the tail node based on the received bias voltage. | 12-15-2011 |
20120306585 | OSCILLATORS WITH LOW POWER MODE OF OPERATION - A method and apparatus for configuring an oscillator circuit to selectively switch between a low power mode and a normal mode of operation. The oscillator circuit includes an oscillator core in parallel with a dynamically configurable gain circuit. The oscillator core is configured to generate a clock signal. One or more gain elements of the gain circuit can be selectively disabled to reduce the operating power level of the oscillator circuit during a low power mode. | 12-06-2012 |
20140306775 | SYSTEM AND METHOD FOR INCREASING A VOLTAGE RANGE ASSOCIATED WITH A VOLTAGE CONTROLLED OSCILLATOR - A system and method are provided for increasing a voltage range associated with a voltage controlled oscillator. A voltage-to-current converter is provided. Additionally, a current controlled oscillator is provided that is in communication with the voltage-to-current converter. Further, at least one circuit component is provided that is in communication with the voltage-to-current converter for increasing a voltage range with which the apparatus operates as a voltage controlled oscillator. | 10-16-2014 |
331183000 | Automatic | 7 |
20080238564 | METHOD FOR ENABLING AN OSCILLATOR CIRCUIT USING TRANSITION DETECTION - An oscillator circuit may be used with controller circuits that are designed to operate with crystals, with no modifications to the pinout or firmware of the controller circuit. In some embodiments, the oscillator circuit includes an enable input that is responsive to low-amplitude transitions, which may be coupled to and driven by the crystal output signal of the controller circuit. When transitions are present on the crystal output signal, the oscillator circuit enables its clock output signal. When the controller circuit disables its crystal output signal, the oscillator circuit no longer detects transitions on the crystal output signal coupled to the oscillator circuit enable input, and disables the clock output signal. | 10-02-2008 |
20090066434 | Oscillator Comprising a Startup Control Device - An oscillator device comprises an oscillator core, a capacitive loading unit having a controllable capacitance value and being connected to the oscillator core, and a memory device including a first and a second memory unit and being connected to the capacitive loading unit. The first memory unit is adapted to store a first value to be supplied to the capacitive loading unit for controlling the capacitance value during a start-up time period. The second memory unit is adapted to store a second value to be supplied to the capacitive loading unit for controlling the capacitance value during an operational time period. According to a method for start up of the oscillator device, the amplitude of an oscillator signal is measured. Further, the starting-time instant for the operational time period is chosen as the time instant when the oscillator signal exceeds a predetermined threshold value. | 03-12-2009 |
20090273407 | VOLTAGE CONTROLLED OSCILLATOR HAVING A BANDWIDTH ADJUSTED AMPLITUDE CONTROL LOOP - An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to generate an output signal oscillating at a frequency in response to a first control signal and a second control signal. The second circuit may be configured to generate the second control signal in response to (i) an input voltage and (ii) the output signal. The second circuit (i) generates the second control signal by comparing a peak voltage of the output signal to the input voltage and (ii) adjusts an amplitude of the control signal in response to the comparison. | 11-05-2009 |
20100060371 | Voltage/current regulator system using constant loop gain - A system for providing voltage and current regulator sources based on a oscillator having variable loop gain is described. Only when the oscillator loop gain is at least the value of one does the oscillator oscillate. The oscillator's ability to oscillate is controlled by the one or more variable impedance or gain devices. Negative feedback of the voltage or current output level is used to control the loop gain of the oscillator circuit. | 03-11-2010 |
20110316639 | DIGITAL VCO CALIBRATION METHOD AND APPARATUS - A method and circuitry for calibrating the gain of a VCO (voltage controlled oscillator) is disclosed. In one embodiment, a circuit includes a comparator configured to provide a first indication if the VCO gain is not within the specified gain range, and a second indication if the VCO is within the specified gain range. The circuit further includes a control unit configured to, upon occurrence of at least a first cycle of a clock signal, cause adjustment of the VCO gain responsive to receiving the first indication. For each one or more successive cycles of the clock signal, the control unit is configured to cause corresponding adjustments of the VCO gain until the comparator provides the second indication. The control unit is configured to discontinue adjustments to the VCO gain responsive to receiving the second indication. | 12-29-2011 |
20140266487 | Low EMI Wide Frequency Range Oscillator With Automatic Digital Amplitude Control - An oscillator/amplifier has a gain controlled amplifier that maintains a desired oscillation waveform amplitude for all possible oscillation frequencies of operation. A peak detector produces a direct current (DC) voltage proportional to the oscillation waveform, and a voltage reference generator provides a reference voltage that is compared against the DC voltage from the peak detector. When the DC voltage is less than the reference voltage the gain of the amplifier is increased, and when the DC voltage is equal to or greater than the reference voltage the gain of the amplifier is decreased. A programmable voltage reference generator may also be used to provide for selection of different oscillation waveform amplitudes. A digital control loop controls the oscillation waveform amplitude over the entire possible frequency range of operation. Various frequency determining elements, e.g., crystal, piezoelectric resonator, inductor-capacitor tuned circuit, resistor-capacitor network, etc., may be used in combination with the oscillator/amplifier. | 09-18-2014 |
20190149155 | Low-Noise Oscillator Amplitude Regulator | 05-16-2019 |