Switch semiconductor integrated circuit
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United States of America Patent
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Apr 11, 2006
Grant Date -
Apr 22, 2004
app pub date -
Mar 19, 2003
filing date -
Oct 21, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A switch semiconductor integrated circuit having a switch FET for controlling passage of a high-frequency signal so that the switch FET is switched between on-operation and off-operation. The switch semiconductor integrated circuit includes a logic control section using of an inverter circuit which generates the switching signal in accordance with a control signal applied from outside. The inverter circuit uses a junction-type FET in which the gate of the switch FET is connected to an output end of the inverter circuit via a gate resistor, and the output end is connected to a coupling capacitor which couples a part of the high-frequency signal. The coupled high-frequency signal is rectified by an equivalent diode between the gate and drain of the junction-type FET, and is superposed onto a DC voltage applied to the gate of the switch FET.
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