Class 331/42 - With particular signal combining means (e.g., cavity mixer)

Subclass of Class 331 - Oscillators
Definition: Subject matter wherein the signal combining means is of
No. of patents: 24
Last issue date: 09/28/2010

Number	Title	Issue Date
7804370	Frequency generator There is provided a feedback circuit including: an oscillator generating an oscillation frequency signal; a mixer unit having an input terminal, a feedback terminal, and an output terminal and outputting a frequency signal through the output terminal, the frequency ...	09/28/2010
7411461	Frequency and/or phase lock loops with beat frequency estimation A control loop (10) for producing an output signal with a stable nominal frequency is provided. The control loop includes inputs for reference (11) and oscillator (25) output signals, a beat frequency generator (12) for producing a signal...	08/12/2008
7363648	Cable modem tuner An IF input signal corresponding to a selected reception channel is applied through an SAW filter to an IF-AGC circuit, the amplitude of the signal is adjusted to a prescribed level, and the signal is thereafter supplied to a down converter unit. The down converter ...	04/22/2008
7271678	Apparatus and method for generating frequencies A frequency generation apparatus and a method are provided. The frequency generation apparatus for generating a plurality of center frequencies for use in multi-band hopping communication, includes: an oscillator generating an oscillation frequency; a reference freq...	09/18/2007
7241630	Paramagnetic particle detection A method of determining the number of magnetic particles within a sample using a tuned circuit having a capacitor and a coil. The method comprises: a. determining the difference in the resonant frequency of the tuned circuit when t...	07/10/2007
7161476	Electronic tire management system An electronic tire maintenance system is provided for measuring a parameter of a device at a first location. The system includes a sensor for measuring the device parameter and generating a data signal representing the measured parameter. The system also includes a ...	01/09/2007
7142614	Signal generating circuit for generating a reference phase signal and a quadrature signal In a signal generating circuit SG1, a 90 -degree divider 3 generates, from a local oscillation signal SLO supplied through an input terminal 1, an intermediate reference phase signal ISREF and an intermediate quadrature sig...	11/28/2006
6841983	Digital signal to pulse converter and method of digital signal to pulse conversion A digital signal to pulse converter including a spectral spreader which provides an adjusted clock signal that does not cycle during selected cycles. The adjusted clock signal is written into a multi-port content addressable memory which, as a function of the curren...	01/11/2005
6570458	Low noise microwave synthesizer employing high frequency combs for tuning drift cancel loop A microwave synthesizer includes a drift-cancel loop having a narrow-band input, a low-frequency comb input, a wide-band input, and an output for providing an adjustable-frequency output signal. A narrow-band synthesizer is coupled to the narrow-band inpu...	05/27/2003
6441692	PLL frequency synthesizer The invention provides a high-speed PLL frequency synthesizer in which the frequency of a reference signal can be made larger than a frequency interval of an external output with a simple configuration. An n-th harmonic of an output of a voltage-controlle...	08/27/2002
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
6194929	Delay locking using multiple control signals A delay-locked loop includes a phase detection circuit, a charge pump circuit and a phase shift circuit. The phase detection circuit is coupled to receive a first signal and a second signal. The phase detection circuit generates a phase-error output signa...	02/27/2001
6127962	Image rejection mixer There is provided an image rejection mixer for downconversion of an incoming signal to a lower intermediate frequency signal, using the absolute difference of frequencies between the incoming signal and the local oscillator signal. The image rejection mix...	10/03/2000
5974362	Signal generator for testing radio frequency components A signal generator comprises a number of independent signal sources each of which can be controlled to generate predetermined frequencies and modulation. The outputs of these signal sources can be made available separately at output ports or can be combin...	10/26/1999
5767726	Four terminal RF mixer device A four terminal multiplication circuit capable of mixing up to three input signals. The circuit includes a MOS transistor having gate, source, drain and back-gate terminals. When the circuit is used as an RF mixer or downconverter, an RF signal is provide...	06/16/1998
5717364	Mixer A small and inexpensive mixer that does not require a choke inductor and a large-capacitance capacitor. The mixer has a FET. The FET's source is grounded via a capacitor and is also connected to a power-supply terminal. The FET's gate is coupled to a bias...	02/10/1998
5450227	Optically injection-locked self-oscillating dual-gate MESFET mixer A dual-gate self-oscillating mixer FET that is injection-locked from a remote LO frequency source. The dual-gate FET having a feedback circuit connected between the first gate port and the drain port that is tuned so that the FET can oscillate within a fr...	09/12/1995
5325000	Frequency mixing circuit with impedance transforming power combiner A frequency mixer circuit uses an impedance transforming power combiner to sum the power levels of RF and LO input signals and drive an output field effect transistor (FET). The nonlinear transconductance in the FET creates the sum and difference mixing p...	06/28/1994
5179359	Digitally controlled frequency generator including a crystal oscillator A digitally controlled oscillator (100) having a first oscillator circuit (108) for providing an oscillator signal Fo of a defined frequency and a digital divider (110) for dividing the oscillator signal Fo by a selectable number con...	01/12/1993
4516085	Microwave frequency synthesizer using plural switchable low noise oscillators Disclosed is a low noise microwave frequency synthesizer having a plurality of rapidly switchable output frequencies. Two banks of oscillators are selectively mixed to yield a range of output signals of low phase noise and low spurious noise. The first ba...	05/07/1985
4446447	Circuit for converting pressure variation to frequency variation A transducer for converting a pressure variation to a variation in the frequency of a periodic function includes a reference oscillator and a sensor oscillator coupled to a digital mixer. The reference oscillator includes a reference capacitor and referen...	05/01/1984
4306312	Symmetric mixer for millimeter waves and a receiver using such a mixer The invention aims at obtaining an intermediate beat frequency from two millimeter wave frequencies by attenuating as much as possible the amplitude variations of the frequency coming from the local oscillator. The mixer of the invention comprises two modules ...	12/15/1981
4206421	Arrangement for synchronizing a free-swinging oscillator A system is disclosed for synchronizing a free-swinging oscillator to a reference signal of a substantially lower frequency. A regulating circuit connects to the oscillator to control the frequency thereof. A quartz oscillator is provided for producing th...	06/03/1980
4099228	Harmonic mixing with an anti-parallel diode pair A harmonic mixer utilizing an anti-parallel configuration of two diodes which, when excited by a voltage waveform VLO sin ωLO t + Vs sin ωs t where VLO is much greater than Vs, yields a t...	07/04/1978

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Class 331/42 - With particular signal combining means (e.g., cavity mixer)