Inventor · disambiguated record
Douglas R. Frey
Also filed as: FREY DOUGLAS · FREY DOUGLAS R
18 granted patents·4 pending applications·586 citations·filing 1981–2014
95Inventor score
Files withSILICON LAB INC7FREY DOUGLAS R5ANALOG DEVICES INC3SOLID STATE CHARGERS INC2AT & T BELL LAB1
Top patents by PatentIndex Score
22 records- 0198US6747522B2Digitally controlled crystal oscillator with integrated coarse and fine controlSILICON LAB INC·Filed 2002·Granted Jun 8, 2004·149 cites·23 claims
- 0295US4495640AAdjustable distortion guitar amplifierFREY DOUGLAS R·Filed 1982·Granted Jan 22, 1985·67 cites·18 claims
- 0394US6639534B2Digital-to-analog converter switching circuitrySILICON LAB INC·Filed 2002·Granted Oct 28, 2003·56 cites·31 claims
- 0483US5631968ASignal conditioning circuit for compressing audio signalsANALOG DEVICES INC·Filed 1995·Granted May 20, 1997·54 cites·36 claims
- 0580US9143373B2Transport of an analog signal across an isolation barrierSILICON LAB INC·Filed 2014·Granted Sep 22, 2015·6 cites·20 claims
- 0678US5270635AUniversal battery chargerSOLID STATE CHARGERS INC·Filed 1992·Granted Dec 14, 1993·87 cites·8 claims
- 0776US7548123B2Dividerless PLL architectureSILICON LAB INC·Filed 2007·Granted Jun 16, 2009·9 cites·38 claims
- 0867US5585757AExplicit log domain root-mean-square detectorANALOG DEVICES INC·Filed 1995·Granted Dec 17, 1996·36 cites·2 claims
- 0965US4823093ADynamically biased voltage controlled elementFREY DOUGLAS R·Filed 1987·Granted Apr 18, 1989·17 cites·6 claims
- 1063US6909390B2Digital-to-analog converter switching circuitrySILICON LAB INC·Filed 2003·Granted Jun 21, 2005·10 cites·20 claims
- 1160US5113127AUniversal battery chargerSOLID STATE CHARGERS INC·Filed 1989·Granted May 12, 1992·32 cites·33 claims
- 1257US4560947AMonolithic voltage controlled elementFREY DOUGLAS R·Filed 1984·Granted Dec 24, 1985·12 cites·20 claims
- 1351US5212457AInput buffer with reduced offset for operational amplifiers or the likeAT & T BELL LAB·Filed 1992·Granted May 18, 1993·11 cites·9 claims
- 1450US5528197AVoltage controlled amplifierANALOG DEVICES INC·Filed 1995·Granted Jun 18, 1996·13 cites·7 claims
- 1550US4471320AVoltage controlled elementFREY DOUGLAS R·Filed 1981·Granted Sep 11, 1984·8 cites·28 claims
- 1647US2008080701A1Adaptive Power Offloading for a Subscriber Line Interface CircuitGOLDENBERG MARIUS·Filed 2006·Application pending·0 cites
- 1740US5266881AUniversal high current battery chargerSOLID STATE CHARGERS RESEARCH·Filed 1991·Granted Nov 30, 1993·17 cites·15 claims
- 1839US7269254B2Integrated driver circuitrySILICON LAB INC·Filed 2002·Granted Sep 11, 2007·2 cites·17 claims
- 1939US2012002801A1Subscriber Line Interface Circuitry Line DriverFREY DOUGLAS R·Filed 2010·Application pending·0 cites
- 2038US7688119B2Power supply with digital control loopSILICON LAB INC·Filed 2008·Granted Mar 30, 2010·0 cites·9 claims
- 2136US2009243572A1Power Supply with Digital Control LoopMILLS MICHAEL J·Filed 2008·Application pending·0 cites
- 2232US2009243578A1Power Supply with Digital Control LoopWAHBY RIAD·Filed 2008·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Douglas R. Frey files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →