Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 8188802 | System and method for efficiently generating an oscillating signal An apparatus for generating an oscillating signal including an oscillator configured to generate the oscillating signal, a controller configured to generate a control signal that controls a characteristic (e.g., amplitude or frequency) of the oscillating signal, and... | 05/29/2012 |
| 8174332 | Phase lock loop pre-charging system and method A phase lock loop pre-charging system and method are described. In one embodiment, a phase lock loop pre-charge system includes a bias component for generating a pre-charge voltage, and an activation component for activating the bias component. In one exemplary impl... | 05/08/2012 |
| 8169271 | Interference resistant local oscillator With some embodiments, a VCO (voltage controlled oscillator) operates at an integer multiple (N) above a desired transmission frequency. In accordance with one embodiment, a chip is provided with a VCO to generate a signal and a frequency dividing circuit to provide... | 05/01/2012 |
| 8098111 | Reduced phase noise multi-band VCO Embodiments of a multi-band voltage controlled oscillator (VCO) are provided herein. The multi-band VCO is configured to adjust a frequency of an output signal based on an input signal. The multi-band VCO includes a tank module, an active module, and a control modul... | 01/17/2012 |
| 8031026 | System and method for efficiently generating an oscillating signal An apparatus for generating an oscillating signal including an oscillator configured to generate the oscillating signal, a controller configured to generate a control signal that controls a characteristic (e.g., amplitude or frequency) of the oscillating signal, and... | 10/04/2011 |
| 7969253 | VCO with stabilized reference current source module A VCO includes a reference current module and a clock signal generating module. The reference current module generates a reference current according to a reference voltage. The clock signal generating module generates a clock signal according to the reference curren... | 06/28/2011 |
| 7965150 | Differential oscillation apparatus and modulator It is an object of the present invention to shorten a time required until phases of output signals being output from two output terminals are inverted respectively from a start time of an oscillation in a differential oscillation apparatus. In a differential oscilla... | 06/21/2011 |
| 7902935 | Bias circuit and voltage-controlled oscillator A bias circuit and a voltage-controlled oscillator (VCO) thereof suitable for improving the stability of the bias circuit are provided. The bias circuit includes: an error amplifier circuit, having an inverting input terminal connected to a reference voltage; a volt... | 03/08/2011 |
| 7898350 | Frequency stabilizing device of an oscillator A frequency stabilizing device of an oscillator is disclosed. The frequency stabilizing device of an oscillator is used for stabilizing the frequency of an oscillator to keep the frequency in constant when input voltage is changed. The frequency stabilizing device c... | 03/01/2011 |
| 7852168 | Power-efficient biasing circuit Energy-efficient timing circuits are described. Such circuits may include a biasing circuit configured to provide a control bias current to a voltage-controlled oscillator (VCO). The biasing circuit may repetitively switch between a normal-power operating mode and a... | 12/14/2010 |
| 7772935 | Oscillator voltage source circuits A power source circuit for an oscillator is provided comprising a multiplexer, a plurality of transmission gates, a plurality of resistors, a current source circuit, and an output circuit. The multiplexer inputs a digital signal and outputs one or more control signa... | 08/10/2010 |
| 7728688 | Power supply circuit for a phase-locked loop A power supply circuit includes a first voltage regulator to generate a first supply voltage for a first circuit of a phase-locked loop and a second voltage regulator to generate a second supply voltage for a second circuit of the phase-locked loop. The first and se... | 06/01/2010 |
| 7728687 | Negative resistance oscillator with additional bias current injection An oscillation circuit and the method for operating the same. The circuit includes (a) an LC oscillator including an inductor and a variable capacitor; (b) first and second differentially-coupled transistors (i) electrically coupled to the LC oscillator and (ii) con... | 06/01/2010 |
| 7679467 | Voltage controlled oscillator A voltage controlled oscillator which performs an oscillating operation at a frequency corresponding to a control voltage, includes a voltage-current converter circuit which converts the control voltage to a control current corresponding to a voltage value thereof, ... | 03/16/2010 |
| 7667550 | Differential oscillator device with pulsed power supply, and related driving method The present invention concerns a differential oscillator device, comprising resonant electronic means, capable to provide on at least two terminals at least one oscillating signal VOUT, which comprises a generator electronic means capable to supply at lea... | 02/23/2010 |
| 7663446 | Adjustable supply voltage in a voltage controlled oscillator (VCO) for wide range frequency coverage Methods, algorithms, architectures, circuits, and/or systems for increasing voltage controlled oscillator (VCO) operational frequency ranges are disclosed. In one embodiment, a VCO can include 2n+1 transconductors configured to provide an oscillating signal, where n... | 02/16/2010 |
| 7636023 | System and method for characterizing a potential distribution An apparatus for characterizing an operating parameter in an integrated circuit, in accordance with one embodiment of the present invention, includes a voltage potential module, a plurality of distribution systems and a plurality of ring oscillator modules. Each rin... | 12/22/2009 |
| 7616074 | Low-power fast-startup oscillator with digital feedback control Embodiments of the present invention provide a system for controlling a startup time of an oscillator circuit. The system includes a variable current source coupled to the oscillator circuit, wherein a startup time of the oscillator circuit is proportional to a bias... | 11/10/2009 |
| 7579920 | Self-biasing low-phase noise LC oscillator A self-biasing negative transconductance LC oscillator that uses self-biasing circuitry to regulate a current source that feeds negative transconductance circuitry and direct current (DC) bias circuitry to apply a DC bias between control inputs and outputs of the ne... | 08/25/2009 |
| 7564320 | Voltage-controlled oscillator A voltage-controlled oscillator (VCO) includes: an oscillation unit, for generating an oscillation signal according to a biasing current; a current mirror, for providing the biasing current, the current mirror comprising: at least one first transistor, coupled betwe... | 07/21/2009 |
| 7522010 | Ultra-low power crystal oscillator An ultra-low power crystal oscillator architecture that draws less than 2 μA during steady state operation. An amplifier stage is self biased and has input and output clamp circuits that limit its signal swing. Circuit values are selected such that there is suffici... | 04/21/2009 |
| 7515009 | Oscillating apparatus with adjustable oscillating frequency The present invention relates to an oscillating apparatus. The oscillating apparatus includes a biasing circuit, a multi-vibrator, a detecting circuit, and a selecting circuit. The biasing circuit is for generating a bias signal, wherein the biasing circuit includes... | 04/07/2009 |
| 7486153 | Circuit and method for controlling an oscillation loop The circuit for controlling the oscillation frequency of an oscillation loop (66) has among others the following components—a first tunable capacitor unit (80) for providing a selectable amount of capacitance to the oscillator loop in accordance with... | 02/03/2009 |
| 7449973 | Semiconductor circuit for reducing flicker noise A semiconductor circuit for reducing flicker noise includes a negative-conductance generator and a body bias voltage supplying circuit. The negative-conductance generator includes a pair of cross-coupled field effect transistors in order to generate negative-conduct... | 11/11/2008 |
| 7443260 | Low-power oscillator A circuit can include an oscillator core that outputs, in response to a bias signal, a periodic signal having an oscillation frequency; a bias circuit that, when powered, provides the bias signal (e.g., a voltage) to the oscillator core; and a switching circuit that... | 10/28/2008 |
| 7432772 | Electrical oscillator circuit and an integrated circuit An electrical oscillator circuit (301, 302) comprising: a resonator (303) comprised in the first subcircuit (301); and an active device (309) comprised in the second subcircuit (302) connected to energize the resonator (303)... | 10/07/2008 |
| 7432773 | Method, system and apparatus for reducing oscillator frequency spiking during oscillator frequency adjustment Current sources are selectively coupled to a current controlled frequency determining circuit of an oscillator. A buffer amplifier has an input coupled to the current controlled frequency determining circuit of the oscillator and the buffer amplifier output is selec... | 10/07/2008 |
| 7432484 | Current control for high-frequency heating apparatus The invention relates to a high frequency heating apparatus and provides a tracking method of a frequency modulation in order to prevent an extension of the harmonic current component of an oscillation threshold ebm which varies from moment to moment in accordance w... | 10/07/2008 |
| 7429897 | Wide operating-frequency range voltage controlled oscillators Voltage controlled oscillator (VCO) circuitry with low phase noise and a wide range of operating frequencies is presented. The VCO circuitry includes circuitry with two or more VCO sub-circuits, each sub-circuit being optimized to produce output clock signals with l... | 09/30/2008 |
| 7418614 | External signal detection circuit and real-time clock An external signal detection circuit includes an input port, to which a first end of a circuit including a pull-up resistor connected in series with a first switch portion is connected, the input port receiving an input of an external signal; an input detection port... | 08/26/2008 |
| 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 |
| 7414487 | Apparatus for providing an oscillating signal to a load An apparatus for providing an oscillating signal to a load comprises: a phase locked loop, PLL, comprising a feedback loop; a power control means for manipulating oscillating signal power; an isolator for isolating the feedback loop from the load; and a mode selecto... | 08/19/2008 |
| 7400206 | Clock circuit with programmable load capacitors In one embodiment, the present invention includes methods and apparatus for providing initial control values to programmable load capacitors of an oscillator, such as that of a real time clock circuit. Using the initial values, the real time clock circuit may begin ... | 07/15/2008 |
| 7397315 | 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 ... | 07/08/2008 |
| 7391277 | Interleaved voltage controlled oscillator An interleaved voltage-controlled oscillator (VCO) is disclosed. The VCO includes a ring circuit comprising a series connection of main logic inverter gates, a plurality of delay elements connected in parallel with a selected sequence of the main logic inverter gate... | 06/24/2008 |
| 7391274 | Low voltage operating ring oscillator with almost constant delay time Methods and circuits for chain ring oscillators having a constant delay time over variations of temperature and variations of semiconductor manufacturing process while requiring low operating voltage only have been disclosed. A system current source includes a const... | 06/24/2008 |
| 7391276 | Oscillation apparatus capable of compensating for fluctuation of oscillation frequency In an oscillation apparatus formed by a ring oscillator including an odd number of inverters (more than two inverters) connected in a ring, each of the inverters having one drive MOS transistor and one load MOS transistor, a constant voltage generating circuit is ad... | 06/24/2008 |
| 7388447 | Integrated clock generator tolerant to device parameter variation A method and circuit for stabilizing a frequency of a clock generator comprising a ring oscillator with respect to manufacturing process variations and a circuit temperature. A bias circuit comprising a current mirror and cascade circuits provides a compensated bias... | 06/17/2008 |
| 7388443 | Apparatus and method 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... | 06/17/2008 |
| 7382207 | Oscillator circuit suppressing variation of oscillation frequency An oscillator circuit includes: oscillating transistors; a resonance circuit that includes varactor diodes each having a cathode to which a control voltage for controlling an oscillation frequency is applied and that is coupled between a collector and a base of each... | 06/03/2008 |
