Electrostatic discharge protection device for giga-hertz radio frequency integrated circuits with varactor-LC tanks
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United States of America Patent
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Apr 26, 2005
Grant Date -
Apr 22, 2004
app pub date -
Oct 21, 2002
filing date -
Oct 21, 2002
priority date (Note) -
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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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