Oscillators inventions 06/06

20060139102 - Digital frequency synthesiser and a method for producing a frequency sweep: A single chip digital frequency synthesiser (1) for synthesising a frequency swept synthesised output signal of a selectable frequency sweep comprises a direct digital synthesiser (5) which produces the frequency swept synthesised output signal on an output terminal (7) in response to values of a frequency control digital word applied...

20060139108 - Controlling a voltage controlled oscillator in a bang-bang phase locked loop: The frequency changes in a bang-bang PLL that are generated using a digital phase detector's up/down signal are initially set to produce a faster pull-in rate and then reduced to produce a slower pull-in rate. The faster pull-in involves relatively large frequency changes and the slower pull-in rate involves smaller...

20060139104 - Crystal oscillator: An oscillator circuit may be operated in a high power mode or a reduced power mode. The high power mode provides fast start-up of the oscillator circuit....

20060139105 - Method and apparatus to achieve a process, temperature and divider modulus independent pll loop bandwidth and damping factor using open-loop calibration techniques: Several open-loop calibration techniques for phase-locked-loop circuits (PLL) that provide a process, temperature and divider modulus independence for the loop bandwidth and damping factor are disclosed. Two categories of open-loop techniques are presented. The first method uses only a single measurement of the output frequency from the oscillator and adjusts...

20060139107 - Oscillation control apparatus: In a PLL comprising a VCO 1 equipped with a variable resonator 2, a frequency divider 6, a phase comparator 7, and an LPF 8, a variable resonator control signal generation section 10 has the output voltage of LPF 8 as input, detects the f/v sensitivity of VCO 1, generates...

20060139103 - Phase locked loop: A phase locked loop circuit, for providing an oscillating output signal at an output frequency, including: a reference counter; a loop counter; a phase detector having a first input coupled to the reference counter and a second input coupled to the loop counter; a voltage controlled oscillator having an input...

20060139106 - Phase-locked loop circuit: The phase-locked loop circuit includes a gain setting circuit for setting a gain of a voltage controlled oscillator, and a time-constant setting circuit for setting a time constant, which is determined by the amount of current in a charge pump circuit and a capacitance value of a loop filter. The...

20060139109 - Pll-based frequency synthesizer: The frequency synthesizer includes a phase-locked loop (PLL). The PLL includes an oscillator controlled to deliver an output signal at a predefined output frequency, a variable frequency divider to convert the output signal into a divided-frequency signal, a phase comparator to produce a signal measuring a phase difference between the...

20060139111 - Method and apparatus to improve frequency stability of an integrated circuit oscillator: An apparatus providing a simple low cost integrated circuit oscillator with improved frequency stability over a range of selected frequencies by reducing the impact of process and temperature variations on a base current of bipolar transistor of the integrated circuit oscillator. A circuit includes a capacitor coupled to be alternatingly...

20060139110 - Method to compensate the vco buffer q factor at low frequency band: A voltage control oscillator (VCO) buffer for a local oscillator (LO) generator system of a phase locked loop (PLL) in a transceiver chip. The VCO buffer includes a capacitor bank, a VCO buffer core and a current stirring unit. The VCO buffer core receives an input signal, and outputs an...

20060139113 - 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 control module modifies resonant characteristics of the MEMS based resonant structure to...

20060139112 - Resonant clock distribution for very large scale integrated circuits: A circuit for distributing a clock signal in an integrated circuit includes a capacitive clock distribution circuit (102) having at least conductor (115) therein. At least one inductor is formed in a metal layer of the integrated circuit and is coupled to the clock distribution circuit. The inductor, generally in...

20060139114 - Voltage controlled oscillator: A semiconductor device, including a semiconductor substrate having an element region on a surface thereof, an electrical element being formed in the element region; an insulating layer formed on the semiconductor substrate and covering the electrical element; and an inductor formed on the insulating layer and overlapping with the element...

20060139115 - Temperature compensated crystal oscillator and method of manufacturing same: A temperature compensated crystal oscillator has a package body, a crystal blank hermetically sealed in a first recess of the package body, and an IC chip which includes an oscillation circuit electrically connected to the crystal blank, and a temperature compensating mechanism for compensating the crystal blank for the frequency-temperature...

20060139116 - Temperature stabilizer and oscillating apparatus: A temperature stabilizer for accurately stabilizing the temperature of an object is provided. The temperature stabilizer stabilizes the temperature of an object to a reference temperature. The temperature stabilizer includes an oscillator provided in proximity to the object, for generating an oscillation signal having a frequency corresponding to an inputted...

20060132243 - Semiconductor device and voltage-controlled oscillation circuit: A voltage-controlled oscillation circuit (15) includes a plurality of independent ring oscillation circuits different in the number of stages; and a selector (22) selectively outputting as a feedback clock signal (FB) an output of one of the ring oscillation circuits, so that any of the outputs of the independent ring...

20060132245 - Method of correcting the phase difference between two input signals of a phase-locked loop and associated device: A method for correcting the phase difference between two input signals of a phase-locked loop may include a charge pump connected to a filter. Prior to the occurrence of the first of the two input signals, a calibration phase may be carried out in which the input of the filter...

20060132244 - Phase locked loop circuit and control method thereof: A phase locked loop circuit includes a voltage controlled oscillator having an oscillating characteristic value changed by a switching signal. A characteristic controller supplies the switching signal to the voltage controlled oscillator to increase the oscillating characteristic value according to elapse of time. The voltage controlled oscillator oscillates according to...

20060132246 - Glitch free controlled ring oscillator and associated methods: A glitch free controlled ring oscillator may comprise a programmable delay chain connected to a gating and inverter stage or means. A latch or latching means may be provided between the delay chain and the gating and inverter stage or means for registering the clock state at the time of...

20060132247 - Oscillator and charge pump circuit using the same: The present invention provides a current-limited oscillator capable of performing stable operation even when it is driven with a low power-supply voltage, and a charge pump circuit using the oscillator. A current-limited oscillator has a delay section that includes a plurality of series-connected inverters to delay an output pulse on...

20060132248 - Bulk acoustic wave crystal controlled clock with surface acoustic wave filter multiplier: An oscillator circuit comprising a bulk acoustic wave (BAW) crystal clock oscillator that generates a high stability, tight frequency tolerance signal. This signal being multiplied by a surface acoustic wave (SAW) filter multiplier that filters out all signals except the desired harmonic of the BAW oscillator signal resulting in a...

20060132249 - 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 second MOS device and a second...

20060132250 - Voltage- and temperature-compensated rc oscillator circuit: An integrated temperature-compensated RC oscillator circuit includes an inverter having an input and an output. An RC network is coupled between the inverter and a pair of comparators. A first comparator has an inverting input coupled to a first reference voltage, a non-inverting input coupled to the RC network, and...

20060132251 - High-stability piezoelectric oscillator: Design means is provided to prevent electronic parts used in a high-stability piezoelectric oscillator from deterioration due to aging by heat when the high-temperature side of the working temperature range is as high as 85° C. A high-stability piezoelectric oscillator, which is provided with a first constant temperature oven having...

20060132252 - Low power oscillator and method for generating an oscillating signal: A low power oscillator and a method of generating an oscillating signal are disclosed. The low power oscillator includes an oscillating unit for generating a preliminary oscillating signal; an inverter coupled to the oscillating unit in parallel for generating an inverse preliminary oscillating signal fed back to the oscillating unit...

20060132253 - Cmos lc-tank oscillator: A CMOS LC-tank oscillator includes a pair of symmetric inductors and a differential pair of transistors. The inductors have a first one of their terminals interconnected at a supply node to which a voltage supply is applied through a supply resistor and a second terminal connected to the drain of...

20060132254 - Temperature compensated crystal oscillator: The present invention relates to an integrated circuit for a temperature compensated crystal oscillator having an external crystal. The integrated circuit comprises a temperature compensation having one fixed or at least two selectable 3rd and/or 4th and/or 5th and/or higher order temperature compensation functions for at least one specific type...

20060114067 - Pll 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 when the counter circuit has counted a preset number...

20060114068 - Phase-locked loop circuit: A phase-locked loop circuit has an output amplifier (27) and a main feedback path from the output of the output amplifier (27). A subsidiary feedback path is provided directly from the output of the circuit's VCO (32). At the start of operation, the output amplifier (27) is disabled and the...

20060114069 - Phase-locked loop circuit: A phase locked loop (PLL) circuit automatically corrects the offset of the analog (especially active type) loop filter to improve the stability and precision of the locked clock or frequency signals. In addition to the general PLL circuit configuration having active type loop filter (30), the PLL circuit also has...

20060114071 - Phase locked loop: A phase locked loop PLL having a forward path and a feedback path is disclosed. A phase detector drives an oscillator in the forward path of the phase locked loop. The feedback path includes a frequency divider that connects the oscillator output to the phase detector. The phase locked loop...

20060114072 - Methods and apparatuses for changing capacitance: Methods and apparatuses for changing capacitance are provided. The apparatus may adjust a current supplied to a load capacitor according to the frequency of an input clock signal. When operating at a lower frequency, a capacitance may be increased such that noise immunity may be increased. When operating at a...

20060114073 - Temperature compensated r-c oscillator: An R-C oscillator (200) is configured to vary the two voltage levels that are used to control the oscillation, such that the variation in oscillation frequency with temperature is minimized. A first resistor (R1) is used to control one of the voltage levels, and a second resistor (R2) having a...

20060114074 - Semiconductor integrated circuit for communication incorporating oscillator, communication system, and method for manufacturing the semiconductor integrated circuit: A semiconductor integrated circuit for communication has a reference oscillator with high frequency control accuracy. The oscillator has a capacitive load circuit including a plurality of fixed capacitance elements, a plurality of variable capacitance elements, and switch elements connected to the capacitance elements, and is configured such that it can...