Inventor · South Burlington, VT, US

Ram Kelkar

36Patents
10h-index
21Co-inventors
75Inventor score

Filing activity: Aug 31, 1994 → Sep 19, 2014

Most-cited inventions

PatentTitleAreaCited byStatus
US5541442A Integrated compact capacitor-resistor/inductor configuration Electricity 41 Expired
US5491439A Method and apparatus for reducing jitter in a phase locked loop circuit Emerging Cross-Sectional Technologies 33 Expired
US5525932A Lock indicator for phase locked loop circuit Emerging Cross-Sectional Technologies 32 Expired
US5663991A Integrated circuit chip having built-in self measurement for PLL jitter and phase error Electricity 30 Expired
US5828255A Phase locked loop having adaptive jitter reduction Electricity 23 Expired
US6009139A Asynchronously programmable frequency divider circuit with a symmetrical output Electricity 17 Expired
US5680076A Phase-lock indicator circuit with phase-only detection Emerging Cross-Sectional Technologies 16 Expired
US5656977A Frequency-lock indicator circuit with frequency-only detection Emerging Cross-Sectional Technologies 14 Expired
US6456165B1 Phase error control for phase-locked loops Electricity 14 Expired
US6300838A Method and apparatus for derivative controlled phase locked loop systems Electricity 12 Expired
US5513225A Resistorless phase locked loop circuit employing direct current injection Electricity 10 Expired
US8373510B2 Programmable filter for LC tank voltage controlled oscillator (VCO), design structure and method thereof Electricity 9 Active
US6057719A Programmable, self-resetting divider Electricity 9 Expired
US7391271B2 Adjustment of PLL bandwidth for jitter control using feedback circuitry Electricity 8 Active
US6917662B2 Programmable low-power high-frequency divider Electricity 7 Expired
US7545191B2 Method for dividing a high-frequency signal Electricity 6 Active
US7355486B2 Current controlled oscillation device and method having wide frequency range Electricity 6 Active
US6876238B1 Charge pump Electricity 5 Expired
US7049864B2 Apparatus and method for high frequency state machine divider with low power consumption Physics 4 Expired
US9425736B2 Variable capacitor structure Electricity 4 Active
US6943608B2 Wide frequency range voltage-controlled oscillators (VCO) Electricity 4 Expired
US7710206B2 Design structure for improved current controlled oscillation device and method having wide frequency range Electricity 2 Active
US6882230B2 System and method for control parameter re-centering in a controlled phase lock loop system Electricity 2 Expired
US7915963B2 Current controlled oscillation device and method having wide frequency range Electricity 2 Active
US7075350B2 Programmable low-power high-frequency divider Electricity 1 Expired

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