Patent ID: 7696840

Claim:
An RF selection switch circuit, comprising: a first switch comprising: a first switch input port coupled to a first RF signal input port; a first switch output port coupled to an RF signal output port; and a first switch control port; a second switch comprising: a second switch input port coupled to a second RF signal input port; a second switch output port coupled to the RF signal output port; and a second switch control port; a control signal circuitry comprising: a first transistor having a basis DC coupled to an input control port, an emitter DC coupled to ground, and a collector DC coupled to the first diode switch control port and DC coupled to a supply voltage; and a second transistor having a basis DC coupled to the collector of the first transistor, an emitter DC coupled to ground, and a collector DC coupled to the second diode switch control port and DC coupled to a supply voltage, wherein the first switch output port, the second switch output port, and the RF signal output port are connected and are set at a DC level in between ground and supply voltage.