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Class Information
Number: 331/43
Name: Oscillators > Beat frequency > With particular signal combining means (e.g., cavity mixer) > With filter in mixer output circuit
Description: Subject matter wherein a wave filter is included in the mixer output circuit.

Patents under this class:

Patent Number Title Of Patent Date Issued
8290100 Interference detection and mitigation Oct. 16, 2012
7986192 Harmonic rejection mixer and harmonic rejection mixing method Jul. 26, 2011
7805122 Local oscillator with non-harmonic ratio between oscillator and RF frequencies using digital mixing and weighting functions Sep. 28, 2010
7756487 Local oscillator with non-harmonic ratio between oscillator and RF frequencies using pulse generation and selection Jul. 13, 2010
7630417 Crystal whispering gallery mode optical resonators Dec. 8, 2009
7629857 Second harmonic oscillator Dec. 8, 2009
7598815 Multiple frequency generator for quadrature amplitude modulated communications Oct. 6, 2009
7570097 Electronic circuit with low noise delay circuit Aug. 4, 2009
7363648 Cable modem tuner Apr. 22, 2008
7277683 Regenerative divider for up and down conversion of radio frequency (RF) signals Oct. 2, 2007
6816021 Multiple band local oscillator frequency generation circuit Nov. 9, 2004
6570458 Low noise microwave synthesizer employing high frequency combs for tuning drift cancel loop May. 27, 2003
6169585 Circuit arrangement for demodulating an intermediate-frequency video signal Jan. 2, 2001
5982240 Voltage controlled oscillator using a plurality of switchable oscillators Nov. 9, 1999
5878335 Composite direct digital synthesizer Mar. 2, 1999
5825252 Synthesized oscillation circuit Oct. 20, 1998
5770977 Microwave frequency synthesizer with ultra-fast frequency settling and very high frequency resolution Jun. 23, 1998
5508661 Fast tuning YIG frequency synthesizer Apr. 16, 1996
5309116 Multimode crystal oscillator May. 3, 1994
5160901 Multimode crystal oscillator Nov. 3, 1992
4859969 Single transistor dual mode crystal oscillator(U) Aug. 22, 1989
4847888 Field telephone system Jul. 11, 1989
4713556 Frequency converter circuit Dec. 15, 1987
4100504 Band rejection filter having integrated impedance inverter-tune cavity configuration Jul. 11, 1978
3974457 Time and frequency control unit Aug. 10, 1976

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