Electricity: electrical systems and devices – Safety and protection of systems and devices – With tuned circuit
Reexamination Certificate
2005-04-26
2005-04-26
Sircus, Brian (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With tuned circuit
Reexamination Certificate
active
06885534
ABSTRACT:
The present invention relates to a device for protecting high frequency RF integrated circuits from ESD damage. The device comprises at least one varactor-LC circuit tank stacked to avoid the power gain loss by the parasitic capacitance of ESD circuit. The varactor-LC tank could be designed to resonate at the RF operating frequency to avoid the power gain loss from the parasitic capacitance of ESD circuit. Multiple LC-tanks could be stacked for further reduction in the power gain loss. A reverse-biased diode is used as the varactor for both purposes of impedance matching and effective ESD current discharging. Because the inductor is made of metal, both the inductor and the varactor can discharge ESD current when ESD condition happens. It has a high enough ESD level to prevent ESD discharge.
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patent: 6114930 (2000-09-01), Gobbi et al.
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patent: 6194976 (2001-02-01), Cantey et al.
patent: 6552406 (2003-04-01), Voldman
Ker Ming-Dou
Lee Cheng-Ming
Lo Wen-Yu
Kitov Zeev
Silicon Integrated Systems Corporation
Sircus Brian
LandOfFree
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