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Class Information
Number: 331/162
Name: Oscillators > Electromechanical resonator > Crystal > Plural crystals in circuit
Description: Subject matter wherein two or more separate crystals are effectively connected in circuit with the active element of the oscillator.

Patents under this class:

Patent Number Title Of Patent Date Issued
8686804 Orthogonally referenced integrated ensemble for navigation and timing Apr. 1, 2014
8669821 Piezoelectric oscillator Mar. 11, 2014
8669824 Oscillator having a plurality of switchable MEMS vibrators Mar. 11, 2014
8648663 Oscillator having a plurality of switchable MEMS vibrators Feb. 11, 2014
8525607 Crystal oscillator with reduced acceleration sensitivity Sep. 3, 2013
8427251 Temperature compensated oscillator including MEMS resonator for frequency control Apr. 23, 2013
8390388 Differential cancellation of vibration interference in oscillators Mar. 5, 2013
8193869 Feedthrough capacitance compensation for resonant devices Jun. 5, 2012
8188800 Crystal oscillator with reduced acceleration sensitivity May. 29, 2012
7915965 Oscillator having reduced sensitivity to acceleration Mar. 29, 2011
7893784 Composite resonance circuit and oscillation circuit using the circuit Feb. 22, 2011
7800457 Self-calibrating temperature-compensated oscillator Sep. 21, 2010
7733190 Oscillation circuit and oscillator Jun. 8, 2010
7639094 Shared pin resonator oscillators Dec. 29, 2009
7378916 Crystal oscillator device, oscillation method and heater May. 27, 2008
7248127 Crystal oscillator Jul. 24, 2007
7180382 Wide band voltage controlled crystal oscillator Feb. 20, 2007
7170357 Crystal oscillator with wide tuning range Jan. 30, 2007
6756863 High-frequency oscillator of frequency switching type and high-frequency oscillation method Jun. 29, 2004
6545550 Residual frequency effects compensation Apr. 8, 2003
5608356 Thermometer for remote temperature measurements Mar. 4, 1997
5512864 Method and apparatus for compensating for neutron induced frequency shifts in quartz resonators Apr. 30, 1996
5428315 Method of making radiation hardened quartz crystal oscillators Jun. 27, 1995
5406230 Chip type oscillator and oscillation circuit using this oscillator Apr. 11, 1995
5319324 Method of direct bonding of crystals and crystal devices Jun. 7, 1994
5229735 Wide frequency deviation voltage controlled crystal oscillator having plural parallel crystals Jul. 20, 1993
5200714 Crystal oscillator with quartz vibrator having temperature detecting faculty, quartz vibrator for use therein, and method of measuring temperature using quartz vibrator Apr. 6, 1993
4916405 Smart sweep apparatus for data rate receivers Apr. 10, 1990
4851790 Crystal controlled oscillator exhibiting reduced levels of crystal-induced low frequency noise, vibration sensitivity and circuit temperature rise Jul. 25, 1989
4760351 Multiple oscillator device having plural quartz resonators in a common quartz substrate Jul. 26, 1988
4757278 Low noise cryogenic dielectric resonator oscillator Jul. 12, 1988
4745376 Fault tolerant oscillator circuit having redundant resonant elements May. 17, 1988
4734657 RF modem with oscillator switching circuit Mar. 29, 1988
4616194 Piezoelectric oscillator with crystal filter and temperature compensation Oct. 7, 1986
4600900 Piezoelectric oscillator having filters to prevent unwanted modes Jul. 15, 1986
4596697 Chemical sensor matrix Jun. 24, 1986
4575690 Acceleration insensitive oscillator Mar. 11, 1986
4570132 Low noise multiple crystal-controlled oscillator Feb. 11, 1986
4358839 Absolute digital clock system Nov. 9, 1982
4325036 Temperature compensating circuit Apr. 13, 1982
4242611 Methods and apparatus for providing ultra-stable frequency standards and clocks Dec. 30, 1980
4227182 Minute change detecting system Oct. 7, 1980
4219754 Temperature compensation by positioning of plural piezoelectric vibrators in an electronic wristwatch Aug. 26, 1980
4107625 Transistor crystal oscillator which may be paired for generating a beat frequency Aug. 15, 1978
4063194 Wide-band frequency-controlled crystal oscillator Dec. 13, 1977
3978432 Oscillator having plural piezoelectric vibrators parallel connected for temperature compensation Aug. 31, 1976

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