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| Number | Title | Issue Date |
| 7656238 | Frequency synthesizing apparatus and method having injection-locked quadrature VCO in RF transceiver A frequency synthesizing apparatus and method having an injection-locked quadrature VCO in an RF transceiver is provided. In the frequency synthesizer, an I signal following a frequency of a high frequency signal that is input using the injection-locked quadrature V... | 02/02/2010 |
| 7373113 | Frequency generation apparatus and method for data transmission A reference frequency generation method and apparatus for communication systems that transmit and receive data by use of an ultra wide band of at least two frequency groups having at least two reference frequencies. The method and apparatus generate the reference fr... | 05/13/2008 |
| 7323945 | Programmable radio transceiver A fully integrated, programmable mixed-signal radio transceiver comprising a radio frequency integrated circuit (RFIC) which is frequency and protocol agnostic with digital inputs and outputs, the radio transceiver being programmable and configurable for multiple ra... | 01/29/2008 |
| 7075957 | Controlling an optical source using a beat frequency An apparatus and method of controlling an optical signal includes superimposing at least one optical reference signal and the optical signal to obtain at least one interference signal having an actual beat frequency, and pre-selecting one or more of the at least one... | 07/11/2006 |
| 7046099 | Temperature compensated oscillator An oscillator having a desired output frequency, comprising a cavity resonator 102 loaded with an anisotropic dielectric material and an oscillator circuit 100 including the cavity resonator 102 as a frequency determining element, the oscillator... | 05/16/2006 |
| 6960962 | Local oscillator leakage control in direct conversion processes A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is div... | 11/01/2005 |
| 6733121 | One piece front face for magnifying or correcting glasses The present invention is directed to a method of forming a unitary front face for eyeglasses provided with lenses that have magnifying power. ... | 05/11/2004 |
| 6731919 | Amplifier apparatus and method for controlling a local oscillator frequency based on the detected temperature of if bandpass filters Disclosed is an amplifier apparatus that corrects mismatching of the filter transmission characteristic due to a change in the temperature of the amplifier apparatus itself and thereby stably amplifies the high-frequency signal. The amplifier apparatus converts a si... | 05/04/2004 |
| 6590463 | RC oscillator circuit with stable output frequency A RC oscillator circuit with a stable output frequency, having an oscillating integrated circuit working under an operation voltage, the resistor, a first capacitor, a second capacitor, and a transistor. The first and second capacitors construct a RC circ... | 07/08/2003 |
| 6404293 | Adaptive radio transceiver with a local oscillator An oscillator circuit is disclosed which includes an oscillator to generate a first signal having a first frequency, a second oscillation source to generate a second signal having a second frequency, the second oscillator comprising a frequency divider co... | 06/11/2002 |
| 6194931 | Circuit for generating backbias voltage corresponding to frequency and method thereof for use in semiconductor memory device Backbias voltage generation circuit corresponding to the frequency of a chip control signal is disclosed. The circuit includes a normal driving unit, an active driving unit and a level detecting unit. The level detecting unit detects whether a backbias vo... | 02/27/2001 |
| 6169585 | Circuit arrangement for demodulating an intermediate-frequency video signal In a circuit arrangement for demodulating an intermediate-frequency video signal generated while using a Nyquist edge, having a phase-locked loop (1) including a phase detector (3), a loop filter (4) and a voltage-controlled oscillator (5), and a video de... | 01/02/2001 |
| 6163229 | Frequency generator for generating two independent FSK signals A frequency generating circuit scales a warp range of a frequency signal. The frequency generating circuit includes a first frequency signal (10) having a first offset signal with a first frequency relationship to the first frequency signal, and a second ... | 12/19/2000 |
| 6151076 | System for phase-locking a clock to a digital audio signal embedded in a digital video signal A system for phase-locking a clock to a digital audio signal embedded within a digital video signal uses an audio extractor, frequency dividers, and an adjusted bandwidth loop filter to prevent phase jitter associated with the digital audio signal prevent... | 11/21/2000 |
| 6044333 | Process and device to transmit data between a read/write device and a transponder The invention relates to a device and process for data transmission. The data is transmitted by changes in the field strength of an electromagnetic or magnetic field, and then the times between at least two sequential field strength changes are evaluated.... | 03/28/2000 |
| 6005446 | Microwave frequency synthesizer An apparatus and method for synthesizing low-noise, high stability, multi-frequency microwave signals is disclosed. The output frequencies of a lower frequency, low-noise, synthesizer are upconverted to higher microwave frequencies by mixing these frequen... | 12/21/1999 |
| 5847612 | Interference-free broadband television tuner An interference free local oscillator circuit is disclosed. A first local oscillator signal is generated in a first phase locked loop. A second local oscillator signal is generated in a second phase locked loop. Third and fourth phase locked loops provide... | 12/08/1998 |
| 5748047 | Microwave frequency generator and method of generating a desired microwave frequency signal A microwave frequency generator and method of generating a predetermined microwave signal. The invention comprises oscillator means to generate a determinable frequency signal and means responsive to the frequency signal received from the oscillator means... | 05/05/1998 |
| 5625324 | Ultra low noise frequency generator producing the sum of plural signal sources The frequencies of N oscillators are summed to provide a signal generator output signal. Because the phase noise power spectral densities of the oscillators add as power, the frequency summed output exhibits a noise degradation over a single oscillator of... | 04/29/1997 |
| 5519359 | Microwave oscillator with loop frequency conversion to and signal amplification at an intermediate frequency A microwave oscillator with loop frequency conversion to and signal amplification at an intermediate frequency. A high-Q sapphire dielectric resonator is coupled in a frequency conversion loop between a pair of balanced mixers. One mixer comprises a downc... | 05/21/1996 |
| 5408201 | Frequency synthesizer using three subfrequency synthesizers for generating two different frequencies A frequency synthesizer includes three subfrequency synthesizers: a first synthesizer generating a first subfrequency varying in units of a frequency step, a second synthesizer generating a second subfrequency varying in units of a frequency step being N ... | 04/18/1995 |
| 5309116 | Multimode crystal oscillator A multimode oscillator is disclosed which employs a single gain loop for exciting at least two modes of a resonator to cause the oscillator to oscillate simultaneously at at least two frequencies. The multimode oscillator comprises the resonator, an ampli... | 05/03/1994 |
| 5160901 | Multimode crystal oscillator A multimode oscillator is disclosed which employs a single gain feedback loop for exciting at least two modes of a resonator to cause the oscillator to oscillate simultaneously at at least two frequencies. The multi-mode oscillator comprises the resonator... | 11/03/1992 |
| 5056144 | Fast switching drive circuit for a ferri-resonant oscillator Apparatus for allowing low noise and fast frequency switching of a ferri-resonant oscillator, such as YIG, that uses a coil to control output signal frequency by current level. The apparatus positions an active filter in parallel with the oscillator coil,... | 10/08/1991 |
| 4823399 | Refined tuning of RF receiver with frequency-locked loop In an RF receiver having a phase-locked loop demodulator and FLL tuning in its RF converter, the frequency of the VCO output signal in the phase-locked loop (PLL) demodulator is controlled indirectly by the FLL in the RF converter in response to a measure... | 04/18/1989 |
| 4683444 | Generator circuit for generating two sinusoidal signals with a phase difference of 90 degrees A generator circuit according to the invention generates two 90° phase-shifted frequency-variable sinusoidal signals by mixing the output signal of a fixed-frequency oscillator and of a continuously variable oscillator with the aid of two multipliers ope... | 07/28/1987 |
| 4510463 | Automatic gain controlled frequency discriminator for use in a phase locked loop A frequency discriminator having a wide capture band is shown to comprise, in addition to a conventional phase detector having two channels fed by a signal whose frequency is to be determined (the first one of the channels containing a tuned circuit opera... | 04/09/1985 |
| 4338575 | Process for compensating temperature variations in surface wave devices and pressure transducer utilizing this process An arrangement for temperature compensating transducers including two elastic surface wave oscillators whose frequencies are mixed to produce an output frequency that is a function of a parameter to be measured such as force, pressure or acceleration. A d... | 07/06/1982 |
| 4270100 | Microwave acoustic wave oscillator The microwave oscillator is formed by a free oscillator 1 coupled with two surface or volume acoustic wave delay lines 9 and 10 connected in series or in parallel and operating by reflection. The first line imposes a delay 2͌1, corresponding t... | 05/26/1981 |
| 4245193 | High-Q multi-mode resonator controlled source An oscillation control circuit in which the output of an unstabilized oscillator is controlled using a bulk acoustic wave resonator. The circuit includes a high and low frequency loop with the power output of the oscillator being divided and supplied alon... | 01/13/1981 |
| 3974457 | Time and frequency control unit The present invention relates to a time and frequency control unit which is apable of compensating for long-term crystal oscillator drift and other errors in a reference oscillator signal by both coarse and fine (vernier) controlling. The invention takes t... | 08/10/1976 |
