High-frequency switch circuit and mobile telecommunications...

Details High-frequency switch circuit and mobile telecommunications... High-frequency switch circuit and mobile telecommunications...

2006-03-28

2006-03-28

Trinh, Sonny (Department: 2687)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S575700, C455S550100

Reexamination Certificate

active

07020453

ABSTRACT:
An object is to provide an antenna switch semiconductor integrated circuit which reduces a consumption current. To this end, of two control input signals which are fed to a logic circuit which controls turning on and off of a plurality of switching FETs, a control input signal for switching between a sending mode and a receiving mode is fed to an oscillation circuit, thereby making the oscillation circuit operate only during the sending mode under which the logic circuit needs a high voltage. A voltage raising circuit accordingly operates, whereby a raised voltage is supplied to the logic circuit. During the receiving mode, the oscillation circuit stops, and the voltage raising circuit stops. With a switch turned on using the logic circuit, a power source voltage is supplied directly to the logic circuit when the voltage raising circuit is not in operation. This shortens the operation time of the voltage raising circuit and reduces the consumption current.

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