Oscillators inventions 07/06

20060164174 - Method and circuit for frequency synthesis using a low drift current controlled oscillator with wide output frequency range: A method and circuit for frequency synthesis using a low drift current controlled oscillator configured to provide a wide output frequency and high accuracy are provided. An exemplary frequency synthesis circuit is configured for programmable control of a center frequency of the current controlled oscillator to provide a wide range...

20060164173 - Waveform lineariser: Preferably, a ramp generator 120 is used to apply a modulation signal to the frequency control input of a voltage controlled oscillator via a summer component 110. A direct digital synthesis (DDS) reference component 400 is used to controllably produce a progressive shift in threshold crossing points of the signal...

20060164175 - Method for the detection of an incorrect oscillator frequency and clock generation system: In one embodiment, a clock generation system comprises a redundant clock source (RCS) device for receiving multiple timing signals and for generating at least one clock from the timing signals for distribution to other circuits, and first and second oscillator devices, wherein the RCS device switches between timing signals from...

20060164176 - High resolution pwm generator or digitally controlled oscillator: A high resolution pulse width modulation (PWM) or voltage controlled output (DCO) generator is disclosed. The resolution is increased over that of the circuit clock by delaying the generated signal through a series of delays, all of which are controlled by a delay locked loop. The delays are a small...

20060164177 - Signal-selecting circuit and real time clock device: A signal-selecting circuit applicable to low-active and high-active electronic circuits has a pull-up circuit and a pull-down circuit with one end of each connected to an input port. The pull-up circuit includes a first resistor and a first switch circuit connected serially. The remaining end of the pull-up circuit is...

20060164178 - Voltage-controlled oscillator: With a variable capacitor including a load capacitor of an oscillation circuit having a feedback resistor 1, an inverter 2, and a crystal oscillator 3, and a static capacitance generated between a drain terminal and a gate terminal of MOS transistors 4 and 5, in which source and backgate terminals...

20060158259 - Dual loop pll, and multiplication clock generator using dual loop pll: To provide dual loop PLLs capable of reducing the lock-up time in the initial start-up, and multiplication clock generators contributing to reduction of the power dissipation. The dual loop PLL comprises a dual loop PLL having a phase comparison loop having a phase comparator 1 for comparing phases, and a...

20060158260 - Device and method for carrying out frequency synthesis: A method and a device are proposed for frequency synthesis by means of oscillator means, particularly a digitally controlled oscillator, which are capable of generating output frequencies out of a set of possible output frequencies. For the purpose of generating a desired frequency that is not included in the set...

20060158263 - Fast switching phase lock loop (pll) device and method: A fast switching phase lock loop (PLL) device is provided. The PLL has a voltage controlled oscillator that generates a signal at a frequency according to a received voltage. A memory holds a set of adjustment values, with each adjustment value set to cause the VCO to pre-tune to a...

20060158264 - Frequency synthesizer: According to the present invention, there is provided a frequency synthesizer comprising: a phase locked loop circuit which receives a reference signal having a reference frequency and a first signal having a first frequency, compares phases of the reference signal and first signal, applies a control voltage based on a...

20060158262 - Offset correction in a feedback system for a voltage controlled oscillator: An offset related to a feedback system for a VCO is quantified and then a parameter of the feedback system is adjusted in response to the quantified offset to correct for the offset. Correcting for offset in a feedback system can improve the performance of a PLL by reducing phase...

20060158265 - Semiconductor integrated circuit: During a period of preparation for actual operation, a reference clock is supplied to both a comparison clock input portion and a feedback clock input portion of a phase comparator while a feedback loop of a PLL (phase-locked loop) is interrupted, and a delay of a reset signal within the...

20060158261 - Smart lock-in circuit for phase-locked loops: The smart lock-in circuits basically include a sensor, two stacked PMOS transistors, two stacked NMOS transistors, and a feedback line. If the sensing voltage does not reach the expected voltage compared to the midpoint voltage of the sensor, the output voltage of the sensor turns on the corresponding transistor, which...

20060158266 - Voltage control oscillation circuit and adjusting method for the same: A voltage control oscillation (VCO) circuit and an adjusting method for the same, which enables an adjustment for suppressing the dispersion of the output characteristic in spite of the manufacture-related dispersion of element characteristics, using a simple circuit configuration, are provided. A low-pass filter 15 and a high-pass filter 16...

20060158268 - Discrete clock generator and timing/frequency reference: In various embodiments, the invention provides a discrete clock generator and/or a timing and frequency reference using an LC-oscillator topology, having a frequency controller to control and provide a stable resonant frequency, which may then be provided to other, second circuitry such as a processor or controller. Frequency stability is...

20060158267 - Inductor and capacitor-based clock generator and timing/frequency reference: In various embodiments, the invention provides a clock generator and/or a timing and frequency reference comprising an LC oscillator with a frequency controller to control and provide a stable resonant frequency. Such stability is provided over variations in a selected parameter such as temperature and fabrication process variations. The various...

20060158270 - Electronic circuit including at least one first and one second differential pair with the transistors sharing one and the same well: The disclosure relates to an electronic circuit including at least one first and one second differential pair each including a plurality of transistors. All the transistors of said first and second differential pair are included in a single well....

20060158269 - Electronic circuit including at least one first differential pair with the transistors sharing one and the same source or one and the same drain: The disclosure relates to an electronic circuit including at least one first differential pair including first and second transistors. The first and second transistors share one and the same single source or one and the same single drain....

20060158272 - Real time clock apparatus: A given length of an input signal can be detected with small power consumption. A real time clock apparatus has an oscillating module which outputs an original oscillating clock signal having a predetermined frequency, a plurality of dividing modules which divides the original oscillating clock signal outputted from the oscillating...

20060158271 - 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 circuit; and a variation compensation circuit for compensating the variations generated by the...

20060158273 - Micro-oscillator, semiconductor device and communication apparatus: v

20060158274 - Circuits and methods of generating and controlling signals on an integrated circuit: Embodiments of the present invention include an integrated circuit comprising an integrated transmission line, wherein the integrated transmission line is used as a timing reference for a feedback loop and wherein the feedback loop and the transmission line are integrated on a single integrated circuit. The feedback loop and transmission...

20060158275 - Relaxation oscillator based keypad decoder: The keypad interface element of this invention uses a relaxation oscillator and a digital keypad processor having a counter/timer to decode specific keys. The RC portion of the relaxation oscillator includes a resistance ladder and a set of momentary on pushbutton switches disposed change resistance dependent upon which key is...

20060158276 - Circuit and method for temperature compensation: In the present invention, a temperature compensation circuit is provided. The temperature compensation circuit includes a first oscillator for providing a first clock signal, a timer electrically connected to the first oscillator for clocking a specific time period, a voltage regulator for generating a constant voltage, a second oscillator electrically...

20060152289 - Variable lock-in circuit for phase-locked loops: The variable lock-in circuits basically include a sensor, triggering transistors, current mirror, current source, an N-bit triggering circuit array, and a feedback line. If the sensing voltage does not reach the expected voltage compared to the midpoint voltage of the sensor, the output voltage of the sensor turns on the...

20060152290 - Apparatus and method of oscillating wideband frequency: An apparatus and method of oscillating a wideband frequency are disclosed. The apparatus includes: a frequency oscillating unit for oscillating a predetermined frequency; a phase-locked loop for comparing the oscillated frequency and a reference frequency by feed-backing the oscillated frequency from the frequency oscillating unit and fixing an oscillating frequency...

20060152291 - Oscillator circuit, semiconductor device and semiconductor memory device provided with the oscillator circuit, and control method of the oscillator circuit: There is provided an oscillator circuit capable of obtaining stable frequency by avoiding output having unstable frequency that is likely to occur to an operation/stop-control-feasible type oscillator circuit when oscillation begins. In such an oscillator circuit, an oscillation permitting signal (EN) sets an oscillator section in oscillation-operable state, whereby a...

20060152292 - Voltage-controlled oscillator circuit with analogue and digital actuation: A VCO circuit (20) has a coil (21) and, in parallel therewith, a constant capacitance (24) and adjustable capacitance elements (22, 23). A first capacitance element (22) is formed by one or more varactors whose capacitance can be adjusted by an analogue adjusting voltage (Vtune), while a second capacitance element...

20060152293 - Integrated clock generator and timing/frequency reference: In various embodiments, the invention provides a clock generator and/or a timing and frequency reference using an LC-oscillator topology, having a frequency controller to control and provide a stable resonant frequency, which is integrated with other, second circuitry such as a processor or controller. Frequency stability is provided over variations...

20060152294 - Device for generating function of approximate n-th degree and temperature compensation quartz oscillation circuit: A circuit for generating a component of n-th order includes: six differential amplifiers (15A to 15F) having a pair of input terminals supplied with a common linear input signal and a constant level signal of a predetermined level, outputting a reversed or non-reversed signal to the linear input signal, and...

20060152295 - Semiconductor integrated circuit device and wireless communication device: A semiconductor integrated circuit device having a voltage controlled oscillation circuit that is capable of sufficient oscillation performance and a wireless communication device having the semiconductor integrated circuit device are disclosed. A difference between the maximum value and the minimum value of the oscillation output signal is automatically controlled to...

20060145770 - Integrated pll loop filter and charge pump: A charge pumped phase locked loop circuit (PLL) is disclosed that includes a phase detector for detecting the phase error between a reference clock and an output clock to generate a phase error signal. A charge pump is provided that is controlled by the phase error signal to either source...

20060145768 - Selectively pretuning and updating a phase lock loop: The present invention provides a method and an apparatus for selectively pretuning and updating a phase lock loop, deployed in an integrated circuit including an agile radio, such as a wideband or an ultra wideband frequency agile radio in a telecommunication system, for example, a reconfigurable multiband and/or multistandard mobile...

20060145769 - Vco center frequency tuning and limiting gain variation: This invention describes a method for simultaneous precise center frequency tuning and limiting a gain variation of a voltage controlled oscillator (VCO) of a phase locked loop (PLL) of an electronic device (e.g., a communication device, a mobile electronic device, a mobile phone, etc.). The invention utilizes frequency measurements and...

20060145767 - Vco gain tuning using voltage measurements and frequency iteration: This invention describes a method for gain tuning of a voltage-controlled oscillator of a phase locked loop (PLL) of an electronic device using voltage measurements and a frequency iteration. The invention presents a method of minimizing integrated VCO gain variations. More specifically, the invention implementation is based on an analysis...

20060145771 - Voltage controlled oscillator having improved phase noise: An apparatus for compensating for variations in loop gain of a phase locked loop as a function of frequency, comprising a correction calculator for introducing a loop gain correction as a function of target frequency of a oscillator controlled by the phase locked loop....

20060145772 - Precision frequency and phase synthesis with fewer voltage-controlled oscillator stages: A clock synthesis circuit) including a phase-locked loop and one or more frequency synthesis circuits is disclosed. The phase-locked loop includes a voltage-controlled oscillator (VCO) having a sequence differential stages o produce equally spaced clock phases. The frequency synthesis circuit includes a sequence of adder-and-register units that select one of...

20060145773 - Ring-type voltage oscillator with improved duty cycle: A ring-type voltage-controlled oscillator with a good duty cycle for use in a PLL frequency synthesizer. The delay cell circuit used in the ring-type VCO comprises two first inverters, two resistance units, and a differential delay circuit. The inverters receive respective differential input signals and generate respective differential signals to...

20060145774 - Device for operating a vibrating unit of a vibration resonator: A device for operating an oscillatable unit of a vibration resonator, including a piezodrive, which is connected with the oscillatable unit, and feedback electronics. The feedback electronics excites the piezodrive to oscillate by means of a periodic exciter signal having rising and falling edges. The response signal of the piezodrive...

20060145775 - Frequency offset correction techniques for crystals used in communication systems: A method and system for pulling a crystal frequency are provided, thereby allowing wireless stations to use less accurate crystal oscillators and dramatically reduce cost. A first frequency offset can be determined using a temperature-based method. This temperature-base method can include detecting a temperature substantially that of the crystal oscillator...

20060145776 - High-speed vco calibration technique for frequency synthesizers: The voltage-controlled oscillator (VCO) in a frequency synthesizer using a phase-locked loop (PLL) is calibrated digitally during power up. The VCO has a coarse frequency control and a fine frequency control. The coarse control is a digital phase-locked loop to quantize the broad frequency range into limited number of frequency...