Assignee
CRYSTAL SEMICONDUCTOR CORP
US·74 granted patents·4,214 citations·filing 1985–2000
Top patents by PatentIndex Score
74 records- 0197US4851841AGain scaling of oversampled analog-to-digital convertersCRYSTAL SEMICONDUCTOR CORP·Filed 1987·Granted Jul 25, 1989·127 cites·6 claims
- 0296US5594612AAnalog-to-digital converter with digital linearity correctionCRYSTAL SEMICONDUCTOR CORP·Filed 1994·Granted Jan 14, 1997·142 cites·60 claims
- 0396US5477481ASwitched-capacitor integrator with chopper stabilization performed at the sampling rateCRYSTAL SEMICONDUCTOR CORP·Filed 1994·Granted Dec 19, 1995·174 cites·18 claims
- 0495US6088461ADynamic volume control systemCRYSTAL SEMICONDUCTOR CORP·Filed 1997·Granted Jul 11, 2000·175 cites·42 claims
- 0595US5818370AIntegrated CODEC with a self-calibrating ADC and DACCRYSTAL SEMICONDUCTOR CORP·Filed 1993·Granted Oct 6, 1998·99 cites·5 claims
- 0695US5440305AMethod and apparatus for calibration of a monolithic voltage referenceCRYSTAL SEMICONDUCTOR CORP·Filed 1992·Granted Aug 8, 1995·190 cites·30 claims
- 0795US5157395AVariable decimation architecture for a delta-sigma analog-to-digital converterCRYSTAL SEMICONDUCTOR CORP·Filed 1991·Granted Oct 20, 1992·137 cites·38 claims
- 0895US5012244ADelta-sigma modulator with oscillation detect and reset circuitCRYSTAL SEMICONDUCTOR CORP·Filed 1989·Granted Apr 30, 1991·159 cites·28 claims
- 0994US5594439ADiagnosing problems in an electrical system by monitoring changes in nonlinear characteristicsCRYSTAL SEMICONDUCTOR CORP·Filed 1994·Granted Jan 14, 1997·104 cites·26 claims
- 1094US5274375ADelta-sigma modulator for an analog-to-digital converter with low thermal noise performanceCRYSTAL SEMICONDUCTOR CORP·Filed 1992·Granted Dec 28, 1993·107 cites·28 claims
- 1194US5039989ADelta-sigma analog-to-digital converter with chopper stabilization at the sampling frequencyCRYSTAL SEMICONDUCTOR CORP·Filed 1989·Granted Aug 13, 1991·88 cites·22 claims
- 1293US5777912ALinear phase finite impulse response filter with pre-additionCRYSTAL SEMICONDUCTOR CORP·Filed 1996·Granted Jul 7, 1998·85 cites·32 claims
- 1393US5248970AOffset calibration of a dac using a calibrated adcCRYSTAL SEMICONDUCTOR CORP·Filed 1991·Granted Sep 28, 1993·88 cites·23 claims
- 1493US5079550ACombining continuous time and discrete time signal processing in a delta-sigma modulatorCRYSTAL SEMICONDUCTOR CORP·Filed 1989·Granted Jan 7, 1992·68 cites·14 claims
- 1593US4746899AMethod for reducing effects of electrical noise in an analog-to-digital converterCRYSTAL SEMICONDUCTOR CORP·Filed 1986·Granted May 24, 1988·83 cites·4 claims
- 1692US5644308AAlgorithmic analog-to-digital converter having redundancy and digital calibrationCRYSTAL SEMICONDUCTOR CORP·Filed 1995·Granted Jul 1, 1997·101 cites·48 claims
- 1792US5583501ADigital-to-analog converter with digital linearity correctionCRYSTAL SEMICONDUCTOR CORP·Filed 1994·Granted Dec 10, 1996·87 cites·59 claims
- 1892US5574475ASignal driver circuit for liquid crystal displaysCRYSTAL SEMICONDUCTOR CORP·Filed 1993·Granted Nov 12, 1996·114 cites·25 claims
- 1991US5087914ADC calibration system for a digital-to-analog converterCRYSTAL SEMICONDUCTOR CORP·Filed 1990·Granted Feb 11, 1992·85 cites·31 claims
- 2091US4709225ASelf-calibration method for capacitors in a monolithic integrated circuitCRYSTAL SEMICONDUCTOR CORP·Filed 1985·Granted Nov 24, 1987·73 cites·4 claims
- 2190US5585763AControlled impedance amplifierCRYSTAL SEMICONDUCTOR CORP·Filed 1995·Granted Dec 17, 1996·79 cites·51 claims
- 2290US5121080AAmplifier with controlled output impedanceCRYSTAL SEMICONDUCTOR CORP·Filed 1990·Granted Jun 9, 1992·51 cites·24 claims
- 2389US6212273B1Full-duplex speakerphone circuit including a control interfaceCRYSTAL SEMICONDUCTOR CORP·Filed 1998·Granted Apr 3, 2001·117 cites·63 claims
- 2488US5397944ADense offset calibration circuitry and methodCRYSTAL SEMICONDUCTOR CORP·Filed 1993·Granted Mar 14, 1995·43 cites·7 claims
- 2586US5055846AMethod for tone avoidance in delta-sigma convertersCRYSTAL SEMICONDUCTOR CORP·Filed 1990·Granted Oct 8, 1991·55 cites·12 claims
- 2686US4918454ACompensated capacitors for switched capacitor input of an analog-to-digital converterCRYSTAL SEMICONDUCTOR CORP·Filed 1988·Granted Apr 17, 1990·53 cites·40 claims
- 2786US4849662ASwitched-capacitor filter having digitally-programmable capacitive elementCRYSTAL SEMICONDUCTOR CORP·Filed 1986·Granted Jul 18, 1989·36 cites·3 claims
- 2885US5608676ACurrent limited current reference for non-volatile memory sensingCRYSTAL SEMICONDUCTOR CORP·Filed 1993·Granted Mar 4, 1997·65 cites·5 claims
- 2985US5068660ACombining fully-differential and single-ended signal processing in a delta-sigma modulatorCRYSTAL SEMICONDUCTOR CORP·Filed 1989·Granted Nov 26, 1991·39 cites·9 claims
- 3083US5187390AInput sampling switch charge conservationCRYSTAL SEMICONDUCTOR CORP·Filed 1991·Granted Feb 16, 1993·39 cites·11 claims
- 3182US5748040AFully differential high gain cascode amplifierCRYSTAL SEMICONDUCTOR CORP·Filed 1996·Granted May 5, 1998·50 cites·26 claims
- 3282US5642078AAmplifier having frequency compensation by gain degenerationCRYSTAL SEMICONDUCTOR CORP·Filed 1995·Granted Jun 24, 1997·50 cites·20 claims
- 3382US5590065ADigital decimation filter for delta sigma analog-to-digital conversion with reduced hardware compelexityCRYSTAL SEMICONDUCTOR CORP·Filed 1994·Granted Dec 31, 1996·44 cites·12 claims
- 3481US5376936AOne-bit switched-capacitor D/A circuit with continuous time linearityCRYSTAL SEMICONDUCTOR CORP·Filed 1993·Granted Dec 27, 1994·45 cites·14 claims
- 3581US5351050ADetent switching of summing node capacitors of a delta-sigma modulatorCRYSTAL SEMICONDUCTOR CORP·Filed 1992·Granted Sep 27, 1994·46 cites·12 claims
- 3681US5172115ARatiometric A/D converter with non-rationometric error offsetCRYSTAL SEMICONDUCTOR CORP·Filed 1991·Granted Dec 15, 1992·44 cites·29 claims
- 3780US6952621B1Single-chip audio circuits, methods, and systems using the sameCRYSTAL SEMICONDUCTOR CORP·Filed 2000·Granted Oct 4, 2005·21 cites·5 claims
- 3880US6091824AReduced-memory early reflection and reverberation simulator and methodCRYSTAL SEMICONDUCTOR CORP·Filed 1997·Granted Jul 18, 2000·62 cites·11 claims
- 3980US5644257ASampling circuit charge managementCRYSTAL SEMICONDUCTOR CORP·Filed 1996·Granted Jul 1, 1997·48 cites·12 claims
- 4080US5061925APhase equalization system for a digital-to-analog converter utilizing separate digital and analog sectionsCRYSTAL SEMICONDUCTOR CORP·Filed 1990·Granted Oct 29, 1991·45 cites·12 claims
- 4180US4805198AClock multiplier/jitter attenuatorCRYSTAL SEMICONDUCTOR CORP·Filed 1987·Granted Feb 14, 1989·65 cites·14 claims
- 4280US4748418AQuasi auto-zero circuit for sampling amplifiersCRYSTAL SEMICONDUCTOR CORP·Filed 1986·Granted May 31, 1988·27 cites·3 claims
- 4379US5594442AConfiguration programming of a digital audio serial port using no additional pinsCRYSTAL SEMICONDUCTOR CORP·Filed 1994·Granted Jan 14, 1997·40 cites·34 claims
- 4478US5475323AAmplifier with input common mode compensationCRYSTAL SEMICONDUCTOR CORP·Filed 1994·Granted Dec 12, 1995·35 cites·15 claims
- 4576US5917917AReduced-memory reverberation simulator in a sound synthesizerCRYSTAL SEMICONDUCTOR CORP·Filed 1996·Granted Jun 29, 1999·47 cites·36 claims
- 4673US6052152ADigital carrier synthesis by counting cycles for synchronization to a reference signal that is asynchronous with respect to a digital sampling clockCRYSTAL SEMICONDUCTOR CORP·Filed 1998·Granted Apr 18, 2000·29 cites·20 claims
- 4773US4988954ALow power output stage circuitry in an amplifierCRYSTAL SEMICONDUCTOR CORP·Filed 1989·Granted Jan 29, 1991·20 cites·19 claims
- 4872US5579247AMethod and apparatus for decreasing the interference and noise sensitivity of a ratiometric converter type of circuitCRYSTAL SEMICONDUCTOR CORP·Filed 1995·Granted Nov 26, 1996·34 cites·17 claims
- 4972US4804863AMethod and circuitry for generating reference voltagesCRYSTAL SEMICONDUCTOR CORP·Filed 1986·Granted Feb 14, 1989·25 cites·7 claims
- 5071US5923273AReduced power FIR filterCRYSTAL SEMICONDUCTOR CORP·Filed 1996·Granted Jul 13, 1999·24 cites·39 claims
Showing the top 50 of 74 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when CRYSTAL SEMICONDUCTOR CORP files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →