Inventor · San Jose, CA, US

David Jefferson

64Patents
21h-index
47Co-inventors
88Inventor score

Filing activity: Nov 16, 1992 → Aug 21, 2020

Most-cited inventions

PatentTitleAreaCited byStatus
US6215326A Programmable logic device architecture with super-regions having logic regions and a memory region Electricity 263 Expired
US5744991A System for distributing clocks using a delay lock loop in a programmable logic circuit Electricity 180 Expired
US5963069A System for distributing clocks using a delay lock loop in a programmable logic circuit Electricity 104 Expired
US6107820A Redundancy circuitry for programmable logic devices with interleaved input circuits Electricity 94 Expired
US6130552A Programmable logic integrated circuit with on-chip DLL or PLL for clock distribution Electricity 88 Expired
US5642082A Loop filter level detection circuit and method Electricity 76 Expired
US5699020A Phase latched differential charge pump circuit and method Emerging Cross-Sectional Technologies 74 Expired
US5847617A Variable-path-length voltage-controlled oscillator circuit Electricity 68 Expired
US6292016A Programmable logic with on-chip DLL or PLL to distribute clock Electricity 68 Expired
US5977793A Programmable logic device with hierarchical interconnection resources Electricity 66 Expired
US5850152A Programmable logic array integrated circuit devices Electricity 60 Expired
US6326812A Programmable logic device with logic signal delay compensated clock network Electricity 45 Expired
US5850151A Programmable logic array intergrated circuit devices Electricity 43 Expired
US6127865A Programmable logic device with logic signal delay compensated clock network Electricity 42 Expired
US7725738B1 FPGA configuration bitstream protection using multiple keys Electricity 41 Active
US7606362B1 FPGA configuration bitstream encryption using modified key Electricity 32 Active
US5293623A Random access memory based buffer memory and associated method utilizing pipelined look-ahead reading Physics 31 Expired
US6417694B1 Programmable logic device with hierarchical interconnection resources Electricity 24 Expired
US6965249B2 Programmable logic device with redundant circuitry Electricity 24 Expired
US7818584B1 One-time programmable memories for key storage Electricity 22 Active
US7734043B1 Encryption key obfuscation and storage Electricity 21 Active
US6163195A Temperature compensated delay chain Electricity 21 Expired
US6300794A Programmable logic device with hierarchical interconnection resources Electricity 19 Expired
US6826741B1 Flexible I/O routing resources Electricity 14 Expired
US6600337B2 Line segmentation in programmable logic devices having redundancy circuitry Physics 14 Expired

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