Inventor · Driftwood, TX, US

Jerrell P. Hein

43Patents
16h-index
29Co-inventors
81Inventor score

Filing activity: Sep 26, 1984 → Oct 10, 2008

Most-cited inventions

PatentTitleAreaCited byStatus
US6111712A Method to improve the jitter of high frequency phase locked loops used in read channels Electricity 110 Expired
US5986830A Read/write channel write precompensation system and method using one or more delay clocks Physics 89 Expired
US6141169A System and method for control of low frequency input levels to an amplifier and compensation of input offsets of the amplifier Physics 60 Expired
US4805198A Clock multiplier/jitter attenuator Physics 47 Expired
US5990814A Method and circuit for calibration of flash analog to digital converters Electricity 46 Expired
US7158633B1 Method and apparatus for monitoring subscriber loop interface circuitry power dissipation Electricity 44 Expired
US6028727A Method and system to improve single synthesizer setting times for small frequency steps in read channel circuits Electricity 42 Expired
US7295077B2 Multi-frequency clock synthesizer Electricity 35 Expired
US7436227B2 Dual loop architecture useful for a programmable clock source and clock multiplier applications Electricity 33 Expired
US7064617B2 Method and apparatus for temperature compensation Electricity 24 Expired
US6198816A Capacitively coupled ring detector with power provided across isolation barrier Electricity 19 Expired
US7145359B2 Multiple signal format output buffer Electricity 19 Expired
US7288998B2 Voltage controlled clock synthesizer Electricity 18 Expired
US7187241B2 Calibration of oscillator devices Electricity 17 Expired
US6686803B1 Integrated circuit incorporating circuitry for determining which of at least two possible frequencies is present on an externally provided reference signal and method therefor Electricity 17 Expired
US6298133A Telephone line interface architecture using ringer inputs for caller ID data Electricity 16 Expired
US6934384B1 Subscriber line interface circuitry Electricity 15 Expired
US6456712B1 Separation of ring detection functions across isolation barrier for minimum power Emerging Cross-Sectional Technologies 14 Expired
US5150386A Clock multiplier/jitter attenuator Physics 14 Expired
US6442271B1 Digital isolation system with low power mode Emerging Cross-Sectional Technologies 14 Expired
US6724891B1 Integrated modem and line-isolation circuitry and associated method powering caller ID circuitry with power provided across an isolation barrier Electricity 13 Expired
US5717728A Data/clock recovery circuit Electricity 12 Expired
US6408034B1 Framed delta sigma data with unlikely delta sigma data patterns Electricity 12 Expired
US6104794A Architecture for minimum loop current during ringing and caller ID Electricity 11 Expired
US4595874A Temperature insensitive CMOS precision current source Emerging Cross-Sectional Technologies 10 Expired

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.