Oscillators inventions 08/06

20060192620 - Arrangement, phase locked loop and method for noise shaping in a phase-locked loop: A noise shaping arrangement for a phase locked loop includes a first order sigma-delta modulator (500) arranged to provide a first-order quantized output and a feedback path output (508). A second order sigma-delta modulator (520) is arranged to receive the feedback path output (508) and provides a second order quantized...

20060192621 - Two-system pll frequency synthesizer: A two-system PLL frequency synthesizer includes, a first PLL frequency synthesizer connected with a power line, a current amount controller having a first constant current source connected between the first PLL frequency synthesizer and a ground line, and a constant current source controller for controlling the current of the first...

20060192622 - Semiconductor integrated circuit: A semiconductor integrated circuit includes a phase-locked loop (PLL) circuit configured to generate an oscillation output signal synchronized with a reference clock and a plurality of clock and data recovery (CDR) circuits configured to adjust a phase of the oscillation output signal and a phase of serial data. The PLL...

20060192623 - Apparatus and methods for wide tuning-range ring oscillators: An integrated circuit (IC) includes a ring oscillator. One may tune the ring oscillator by controlling a power supply of the ring oscillator. One may further tune ring oscillator by varying a capacitance of at least one varactor. Using the tuning techniques, one may tune the output frequency of the...

20060192624 - Apparatus and method for generation of noise signal: An apparatus and method for generation of a noise signal are provided. The apparatus includes a noise synthesizing module and a noise signal transfer module. The noise synthesizing module includes a voltage controlled oscillator, a phase frequency detector, a phase locked loop filter, and a reference generator which form a...

20060192625 - Compensated ensemble crystal oscillator for use in a well borehole system: A compensated ensemble crystal oscillator clock system. The clock system includes preferably four quad compensated clocks, a compensated temperature sensor, and software for processing and correcting system response. Physical fabrication of elements of the quad compensated clocks, the compensated temperature sensor and cooperating software minimized drift in frequency of the...

20060192626 - High stability double oven crystal oscillator: A double oven crystal oscillator (DOCXO) is disclosed which is highly stable by incorporating means to reduce the effects of ambient pressure changes on the frequency of the oscillator. The oscillator crystal is mounted in a temperature controlled inner oven to reduce the effects on the frequency stability of the...

20060181353 - Fine clock resolution digital phase locked loop apparatus: A digital phase locked loop apparatus includes an input signal time detecting device that detects a phase of an input signal with prescribed time resolution obtained by dividing a cycle of an operation clock generated by a clock generator at a prescribed time. An output clock generating device outputs output...

20060181354 - Oscillator including phase frequency detectors for detecting a phase difference between two input signals and outputting a control command signal: An oscillator includes phase frequency detectors, each detecting the phase difference between two input signals (output signal and external reference signal) and outputting a control command signal for controlling the output signal to achieve a desired frequency on the basis of the phase difference. A plurality of ICs, each including...

20060181355 - Transformer-based vco for both phase noise and tuning range improvement in bipolar technology: A silicon bipolar VCO implementing a double-coupled transformer is disclosed. The VCO circuit, which is suitable in the field of integrated RF circuits, has been integrated into a universal LNB having a down-converter block and PLL merged into a single die and implemented in silicon bipolar technology. The integrated transformer...

20060181356 - Quadrature voltage controlled oscillator: A quadrature voltage controlled oscillator having low phase noise and excellent output swing characteristics includes a first voltage controlled oscillator for outputting a positive in-phase output signal and a negative in-phase output signal; a second voltage controlled oscillator for outputting a positive quadrature-phase output signal and a negative quadrature-phase output...

20060181357 - Ring oscillator for calibrating phase error and phase-error calibration method therefor: A ring oscillator and a phase error calibration method are provided. The ring oscillator may include a first voltage-current converter for controlling and outputting an amount of tail current Itail according to a magnitude of a first control voltage applied in feedback in a PLL circuit; a second voltage-current converter...

20060181359 - Resistor-capacitor (rc) oscillator insensitive to process, voltage, and temperature variances: There is provided a resistor-capacitor (RC) oscillator circuit insensitive to process, voltage, and temperature variances. The RC oscillator circuit includes a delay unit, a resistor unit, a capacitor, a resistor, and a first controller. The delay unit delays and outputs a signal received through an input terminal. The resistor unit...

20060181358 - Semiconductor device generating accurate oscillating signal based on rc oscillation: A semiconductor device includes a RC oscillator configured to produce at an output thereof a first oscillating signal oscillating at a first cycle, a measurement circuit coupled to the output of the RC oscillator to produce at an output thereof a measurement obtained by measuring a length of the first...

20060181360 - Multivibrator with reduced average offset voltage: This invention relates to monostable and astable multivibrators in which the pulse width or frequency stability, respectively is increased by reducing the effect of the comparator input offset voltage. The reduction is accomplished by alternately reversing the input connections to the comparator....

20060181361 - Accurate untrimmed crystal oscillator: The present invention relates to a crystal oscillator for generating an oscillator signal having a predetermined frequency, wherein a frequency-dependent negative resistance circuit (FDNR) having a negative resistance inversely proportional to frequency squared is connected to an oscillator crystal (Q). Thereby, the voltage across the crystal (Q) approaches the time...

20060181363 - Parallel-structured switched variable inductor circuit: An inductor circuit includes a pair of inductors connected in parallel with each other and a switch for turning on and off electric power to one of the pair of inductors. The inductance of the inductor circuit can be varied and the quality factor Q can be improved. Further, RF...

20060181362 - Voltage-controlled oscillator and rf-ic: There are provided a voltage-controlled oscillator and an RF-IC for W-CDMA, which are capable of ensuring a wide frequency range and improving oscillation stability. The voltage-controlled oscillator (RF-IC) includes: switching A and B inductors generating a magnetic interaction between resonant A and B inductors of a resonant circuit; and an...

20060176118 - 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 currents Ia, Ib of a differential pair is small in the linear line...

20060176119 - Voltage-frequency conversion apparatus and method of changing reference voltage thereof: A voltage-frequency conversion apparatus which comprises a variable current source for charging a capacitor; a current amount adjustment circuit which has a first resistor for applying a first voltage and a second resistor for applying a second voltage and adjusts the amount of a current from the variable current source...

20060176121 - Piezoelectric oscillator having symmetric inverter pair: A piezoelectric oscillator using a pair of first and second inverter amplifiers, includes a piezoelectric vibrator inserted between gate inputs of the first and second inverter amplifiers; load capacitors inserted between a ground and each of the gate inputs of the first and second inverter amplifiers; and resistors inserted between...

20060176120 - Sc cut crystal microbalance: A SC cut crystal microbalance includes a SC cut crystal oscillator, a C mode/B mode switching-type oscillation circuit, a frequency countermand a frequency information processing device, wherein the C mode/B mode switching-type oscillation circuit is switched by a signal received from the frequency information processing device, the frequencies of C...

20060176122 - Mems oscillator drive: The temperature of a remote portion of device having a microelectromechanical oscillator is modulated to create oscillation of the oscillators. In one embodiment, a localized heat source is placed on a device layer of a multilayered stack, consisting of device, sacrificial and substrate layers. The localized heat source may be...

20060170505 - Fractional-n offset phase locked loop: A fractional-N offset phase locked loop (FN-OPLL) is provided. The FN-OPLL includes a fractional divider, a phase detector, a loop filter, a voltage controlled oscillator (VCO), and feedback circuitry. Combiner circuitry combines an initial fractional divide value and a modulation signal to provide a combined fractional divide value. Based on...

20060170506 - Capacitive tuning network for low gain digitally controlled oscillator: According to one exemplary embodiment, a digitally controlled oscillator includes a capacitive tuning network, where the capacitive tuning network controls a frequency of an output signal of the digitally controlled oscillator. The capacitive tuning network includes a switched capacitor array, where a change of a first capacitance of the switched...

20060170507 - Quadrature signal generator for tuning phases of all of four generated quadrature signals: A quadrature signal generator capable of phase-tuning with respect to all of four generated quadrature signals. The quadrature signal generator includes four phase tuning units each having two input terminals, one receiving a differential signal, the other being grounded, and changing a phase of the differential signal to thereby generate...

20060170508 - Micro-oscillator, semiconductor device and communication apparatus: A micro-oscillator is provided. In an example, the micro-oscillator applied to a signal filter and the like, ground capacitance thereof is reduced to control the loss of signal output. An oscillator element having a beam facing lower electrodes and to be electrostatically driven is formed on a substrate, and a...

20060170509 - Fast starting circuit for crystal oscillators: A method for assisting the oscillating starting process of an electromechanical oscillator (10) has the following steps: detection of oscillator oscillations (1b, 1c) which occur in the output signal (1a) from the electromechanical oscillator (10); generation of an excitation pulse (3b) on the basis of a detected oscillator oscillation (1c);...

20060170510 - Mounting structure and method of surface-mount crystal oscillator: A surface-mount crystal oscillator including a container body, a mounting terminal arranged on an outer bottom surface of the container body, a crystal blank hermetically sealed in said container body, and an IC chip having an oscillation circuit electrically connected to the crystal blank and hermetically sealed in the container...

20060170511 - Coarse frequency tuning in a voltage controlled oscillator: Methods and apparatus are presented for performing coarse frequency tuning in a voltage controlled oscillator. The methods and apparatus are directed towards the use of a new voltage controlled oscillator comprising both a binary coding module and a thermometer coding module. The combination of the binary coding module and the...

20060170512 - 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 outputting different oscillation frequencies according to controls of a certain tuning voltage; plural bias units for generating driving voltages...