Famous Patents
The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7961057 | Voltage controlled oscillator An integrated circuit and an apparatus are provided. The integrated circuit comprises a bias circuit, an LC resonator circuit, and a current mode logic (CML) frequency divider. The bias circuit generates first and second bias voltages. The LC resonator circuit gener... | 06/14/2011 |
| 7952438 | Injection locking clock generator and clock synchronization circuit using the same An injection locking clock generator can vary the free running frequency of an injection locking oscillator to broaden an operating frequency range of an oscillation signal injected to itself, thereby performing an injection locking with respect to all frequencies o... | 05/31/2011 |
| 7724096 | Method and system for signal generation via a PLL with undersampled feedback Aspects of a method and system for signal generation via a PLL with undersampled feedback are provided. In this regard, the output of a VCO may clock a DDFS to generate a sampling frequency, and the output of the VCO may be undersampled at the sampling frequency to ... | 05/25/2010 |
| 7570124 | Low power frequency division and local oscillator generation A plurality of inverters are arranged serially to form a ring oscillator and coupled to receive a reference clock signal. The reference clock signal is used to switch the inverters on and off so that not all of the inverters are on at a same time. The ring oscillato... | 08/04/2009 |
| 7557664 | Injection-locked frequency divider An injection-locked frequency divider (ILFD) can go beyond simple frequency division by an even number. In one embodiment, another differential pair of transistors is added to convert the injection signal into differential currents, which are mixed in the original t... | 07/07/2009 |
| 7538625 | Method and enhanced phase locked loop circuits for implementing effective testing A method and enhanced phase-locked loop (PLL) circuit enable effective testing of the PLL. A phase frequency detector generates a differential signal, receiving a reference signal and a feedback signal of an output signal of the PLL circuit. A charge pump is coupled... | 05/26/2009 |
| 7355486 | Current controlled oscillation device and method having wide frequency range A current controlled, phase locked loop device includes a phase detector configured to compare a reference frequency to an output frequency of a current controlled oscillator (ICO), a charge pump coupled to the phase detector and a low pass filter coupled to the cha... | 04/08/2008 |
| 7313369 | Communication semiconductor integrated circuit and radio communication system A communication semiconductor integrated circuit has an oscillator circuit forming part of a transmission PLL circuit fabricated on a single semiconductor chip together with an oscillator circuit forming part of a reception PLL circuit and an oscillator circuit for ... | 12/25/2007 |
| 7271671 | Arranging a crystal to generate an oscillating signal A crystal is loaded with capacitance in such a way that it begins to oscillate at a desired frequency with a resonance circuit (2). Capacitive voltage division is carried out with a voltage divider to at least one terminal (3) of the crystal (1)... | 09/18/2007 |
| 7233211 | Method to improve high frequency divider bandwidth coverage A divider for a local oscillator (LO) generator system of a phase locked loop (PLL) in a transceiver chip. The divider includes at least one divider unit. Each divider unit includes a frequency divider unit for receiving an input signal having an input frequency and... | 06/19/2007 |
| 7216249 | Clock generation system A clock generation system for generating a first-, a second-, and a third-reference frequency clocks having respective frequencies having predetermined ratios to the reference frequency of a reference clock, using PL circuits in such a way that the clocks have suffi... | 05/08/2007 |
| 7183817 | High speed output buffer with AC-coupled level shift and DC level detection and correction A high speed output buffer including an input circuit providing first and second signals within a first voltage range having a first common mode voltage, an AC interface receiving the first and second signals and providing first and second preliminary drive signals,... | 02/27/2007 |
| 7123071 | Method and device for producing delayed signals In order to generate an output signal delayed compared to an input signal and with a defined mark-to-space ratio, it is useful to produce at least first and second intermediate signals delayed differently with respect to the input signal and to combine them to form ... | 10/17/2006 |
| 7084712 | Clock generation system A frequency-divided reference frequency clock is provided as a reference input to a phase comparator. An oscillation frequency signal of a controllable oscillator, having a frequency associated with another reference frequency clock, is frequency divided by a freque... | 08/01/2006 |
| 6856172 | Sequential logic circuit for frequency division A circuit to divide down the frequency of a clock signal, where embodiment circuits comprise a set-reset flip-flop feeding its output to a shift register, and combinational logic to provide feedback from the shift register to the set input port, reset input port, or... | 02/15/2005 |
| 6441656 | Clock divider for analysis of all clock edges A method for dividing a high frequency clock signal for analysis of all clock edges has been developed. The method includes receiving a high frequency clock signal and dividing it up into multiple phases that represent respective edges of the clock signal... | 08/27/2002 |
| 6356123 | Non-integer frequency divider A non-integer frequency divider that is capable of dividing an original clock frequency by a non-integer number into a desired target clock frequency. By this non-integer frequency divider, a phase-shifting circuit is first used to convert the original cl... | 03/12/2002 |
| 6285063 | Resonant circuit having a resonant body mechanically oscillated by electrostatic or magnetic forces The resonant circuit has at least one resonant body of a semiconductor material anchored on the surface of a semiconductor substrate, at least one first electrode being arranged at said semiconductor material, and at least one second electrode. The first ... | 09/04/2001 |
| 6269051 | Semiconductor device and timing control circuit Control on the speed of operation of a delay loop from the output of a variable delay circuit to a delay control input thereof is performed. For example, frequency-dividing circuits are respectively placed at the input and output of the variable delay cir... | 07/31/2001 |
| 6236703 | Fractional-N divider using a delta-sigma modulator A delta-sigma modulator having a dead-zone quantizer and an error shaping digital filter clocked by a signal which is periodic at the frequency of the reference. A dead-zone quantizer provides quantization of a high resolution digital word to a low resolu... | 05/22/2001 |
| 6091306 | Circuit configuration with main and subordinate oscillators Parasitic feedback is prevented in a transmitter, a modulator, or a demodulator from having an interfering influence on the circuit section that generates the mixed frequency. The circuit has a main oscillator and a subordinate oscillator connected downst... | 07/18/2000 |
| 6020790 | Oscillator calibration method and circuit and radio with oscillator In a method of calibration of a voltage controlled oscillator (VCO), the VCO (100) provides an output signal which is used to drive a dividing oscillator (10) such as a relaxation oscillator (RO). The RO has at least two states, one in which the RO provid... | 02/01/2000 |
| 5818302 | Automatic frequency control oscillation circuit A voltage-controlled oscillator generates an oscillation signal having a frequency corresponding to a control signal. A phase comparator detects a phase difference between a reference signal and a frequency-divided signal derived from the oscillation sign... | 10/06/1998 |
| 5801589 | Frequency synthesizer which suppresses a spurious A variable divider in which a dividing number setting parameter can be set is provided in a reference oscillator. When a frequency setting parameter is selected so that a DDS will not output a spurious at a specified level or at a level higher than the sp... | 09/01/1998 |
| 5787135 | Variable frequency divider A phase locked loop includes a voltage controlled oscillator (VCO) for generating output VCO pulses. A frequency divider divides the VCO pulses by a variable number to produce frequency divided pulses whose phase is compared with that of input reference p... | 07/28/1998 |
| 5319802 | Device for the exchange of data by electromagnetic waves In order to increase the sensitivity and range of a system for the exchange of data by microwaves between a fixed station, or reader, and a mobile station, or badge, the modem of the badge includes an oscillator. A single transistor works, under a first b... | 06/07/1994 |
| 5245593 | Clock producing apparatus for a PWM system digital to analog converter A clock producing apparatus for a D/A converter switches the clocks in accordance with the inputted sampling frequencies. A deterioration in the S/N caused by unnecessary spectra which are caused by the inputting of different sampling frequencies is preve... | 09/14/1993 |
| 5089717 | Intergrated semiconductor device including a frequency divider for microwave applications An integrated semiconductor device including a frequency divide-by-two circuit comprising an inverter stage and a switching transistor (T2) which is controlled by a microwave input signal (E). The divider circuit includes an oscillator stage in that the i... | 02/18/1992 |
| 5008571 | Method and apparatus for dividing high frequency analog signals A frequency divider includes a power divider which receives an input signal and divides the input signal into first and second signals. A frequency doubler receives the first signal and provides a third signal having a frequency which is twice the frequen... | 04/16/1991 |
| 4868514 | Apparatus and method for digital compensation of oscillator drift This disclosure concerns digital correction of oscillator drift by providing phase alignment between two clock signals running at nearly the same frequency. Phase alignment is provided by fashioning a delay for one of the clock signals through selection o... | 09/19/1989 |
| 4698619 | Variable frequency fire tone generator An alarm message generation and broadcast system having supervision including an alarm message generation circuit for generating an alarm message, an output for receiving the alarm message so that the alarm message can be broadcast in response to an alarm... | 10/06/1987 |
| 4631500 | Microwave frequency divider having regenerative oscillation A microwave frequency divider circuit. The frequency divider comprises a nonlinear amplifier including input and output ports for amplifying signals applied to the input port. The amplifier exhibits a nonlinear transconductance characteristic between its ... | 12/23/1986 |
| 4434696 | Instrument for comparing equal temperament and just intonation Equal-ratio scales offer a choice of semitone accuracies ranging from a thousandth cent to a millionth of a cent, any note of which may be selected as a reference for a fully chromatic just-intonation scale whose ratios are absolute and may be modulated i... | 03/06/1984 |
| 4357580 | Wideband microwave frequency divider A signal of frequency value FIN is coupled to a discriminator and to one terminal of a voltage controlled oscillator (VCO) tuned to operate at a range of frequencies about FIN .div.N where N is a nonunity positive integer. The discri... | 11/02/1982 |
| 4347484 | Synthesizer having an injection synchronized divider A phase-locked loop circuit for use in locking onto a sub-harmonic of the frequency of a reference source. An oscillator operating at the sub-harmonic frequency is injection-synchronized to the primary voltage controlled oscillator of the phase-locked loo... | 08/31/1982 |
| 4333374 | Submultiple-related-frequency wave generator A digital oscillator generates a basic pulse having a period which is a predetermined large number of times of a clock pulse period. During the basic pulse period are allotted a predetermined small number of time slots defining submultiple frequency chann... | 06/08/1982 |
| 4228403 | Submultiple-related-frequency wave generator A digital oscillator generates a basic pulse having a period which is a predetermined large number of times of a clock pulse period. During the basic pulse period are allotted a predetermined small number of time slots defining submultiple frequency chann... | 10/14/1980 |
| 4169256 | Digitally controlled oscillator A digitally controlled oscillator is provided with a memory, storing the half periods Ti (i=1, 2, ..., n) of corresponding frequencies fi =1/(2Ti) to be generated, and with a digital feedback circuit, in which circuit the ... | 09/25/1979 |
| 4156115 | Apparatus and method for a multiple tone code sender system for automatic call initiation A tone sender system for producing analog tone pairs for transmission of the digits comprising a telephone number. Dual codes, multi-frequency and touch calling multi-frequency, are produced to generate simulated test call originations. This tone sender s... | 05/22/1979 |
| 4101838 | Clock pulse generating apparatus A clock pulse generating apparatus comprises a pulse generator for generating a pulse signal of a predetermined cycle, a frequency divider including a plurality of frequency division stages for frequency dividing an output pulse from the pulse generator, ... | 07/18/1978 |
