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Class Information
Number: 331/158
Name: Oscillators > Electromechanical resonator > Crystal
Description: Subject matter wherein the frequency determining electrically driven material body is a crystal exhibiting the piezoelectric effect. Examples of such crystals are quartz, Rochelle salt, tourmaline or other crystal classes which do not possess a center of symmetry and wherein deformation of the crystal is proportional to the first power of the imposed electric field, the direction of deformation referring upon reversal of the field.










Sub-classes under this class:

Class Number Class Name Patents
331/164 Anode or cathode to grid crystal circuit 0
331/163 Crystal having three or more electrodes in circuit 23
331/162 Plural crystals in circuit 46
331/159 Plural tube 19
331/161 With crystal substitution 18
331/160 With means to limit crystal current or voltage 72


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Patent Number Title Of Patent Date Issued
6292066 Function generator, crystal oscillation device and method of adjusting crystal oscillation device Sep. 18, 2001
6285264 Crystal oscillator with frequency trim Sep. 4, 2001
6281761 Temperature-adaptive capacitor block and temperature-compensated crystal oscillator using it Aug. 28, 2001
6278336 Low-current oscillator with hysteresis input buffer Aug. 21, 2001
6278338 Crystal oscillator with peak detector amplitude control Aug. 21, 2001
6271736 Digital temperature-compensating crystal oscillator, and method for stabilizing frequency thereof Aug. 7, 2001
6271734 Piezoelectric oscillator Aug. 7, 2001
6271733 Integrated oscillator circuit with a memory based frequency control circuit and associated methods Aug. 7, 2001
6268776 Digitally tuned and linearized low voltage crystal oscillator circuit Jul. 31, 2001
6259333 Temperature compensation quartz oscillator Jul. 10, 2001
6259329 Reference-frequency-signal switching circuit Jul. 10, 2001
6239662 Mis variable capacitor and temperature-compensated oscillator using the same May. 29, 2001
6236282 Crystal reference and oscillator circuit using same May. 22, 2001
6229404 Crystal oscillator May. 8, 2001
6225872 Resonator having a selection circuit for selecting a resonance mode May. 1, 2001
6215370 Crystal oscillator circuit with crystal reducing resistance and integrated circuit therefor Apr. 10, 2001
6208213 Thermostatically controlled crystal oscillator Mar. 27, 2001
6191659 Integrated oscillator with reduced jitter Feb. 20, 2001
6191661 Oscillator circuit with reduced capacity for AC coupling capacitor Feb. 20, 2001
6191662 Self-start circuits for low-power clock oscillators Feb. 20, 2001
6188290 Method of initializing an oscillator circuit Feb. 13, 2001
6181214 Voltage tolerant oscillator input cell Jan. 30, 2001
6181215 Quartz oscillator circuit having synchronously switched frequency adjusting capacitors Jan. 30, 2001
6181217 VCXO with reduced PWM effects high slew rate conditions Jan. 30, 2001
6177847 Oscillating circuit Jan. 23, 2001
6175284 Temperature-compensated crystal oscillator having constant voltage generator with filter Jan. 16, 2001
6172574 Quartz crystal oscillator frequency modulation circuit Jan. 9, 2001
6172576 Capacitor array unit connected to oscillation circuit with a piezoelectric reasonator, capacitor array unit controller oscillation frequency adjusting system and oscillation frequency adjustin Jan. 9, 2001
6172575 Oscillation circuit and method of obtaining an oscillation signal Jan. 9, 2001
6169462 Oscillator with controlled current source for start stop control Jan. 2, 2001
6166609 Oscillator circuit supplied with optimal power voltage according to oscillator output Dec. 26, 2000
6166608 Thermo-electric cooled oven controlled crystal oscillator Dec. 26, 2000
6160459 Temperature-compensated crystal oscillator Dec. 12, 2000
6160457 Universal crystal-oscillator input/output circuit for application-specific integrated circuit with enhanced charge device mode electrostatic discharge protection Dec. 12, 2000
6160458 Temperature compensated crystal oscillator Dec. 12, 2000
6157265 Programmable multi-scheme clocking circuit Dec. 5, 2000
6154095 Phase locked loop clock source provided with a plurality of frequency adjustments Nov. 28, 2000
6147564 Oscillation circuit having electrostatic protective circuit Nov. 14, 2000
6147565 Piezo-oscillator with heater and temperature control circuit Nov. 14, 2000
6137374 Low power clock oscillator Oct. 24, 2000
6136741 Semiconducting ceramic, semiconducting ceramic element, and method for producing the semiconducting ceramic Oct. 24, 2000
6133802 Synchronous carrier recovery circuit and injection locked oscillator Oct. 17, 2000
6133801 Crystal oscillation circuit Oct. 17, 2000
6118348 Oscillator circuit having switched gain amplifiers and a circuit for preventing switching noise Sep. 12, 2000
6111473 Integrated circuit comprising an oscillator Aug. 29, 2000
6104257 Crystal oscillator with eprom-controlled frequency trim Aug. 15, 2000
6097257 Crystal oscillator circuit having transistor with back gate voltage control Aug. 1, 2000
6094105 Oscillator with digital frequency control Jul. 25, 2000
6091307 Rapid turn-on, controlled amplitude crystal oscillator Jul. 18, 2000
6081164 PLL oscillator package and production method thereof Jun. 27, 2000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20










 
 
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