Patent ID: 7755222

Claim:
A circuit for use in an alternating current signal switch comprising: a first field effect transistor having a gate, a source, and a drain, the drain coupled to a first reference node for receiving the alternating current signal; a second field effect transistor having a gate, a source, and a drain, the source of the second field effect transistor coupled to a second reference node and the drain of the second field effect transistor coupled to the source of the first field effect transistor; a first gate resistor coupled to the gate of the first field effect transistor; a second gate resistor coupled to the gate of the second field effect transistor; a DC restoring circuit operable to provide a DC offset to a respective voltage of the gates of the first and second field effect transistors and to maintain the first and second field effect transistors in pinch-off mode when desired, comprising: a resistor having a first end and a second end; a diode having a cathode end and an anode end, the anode end coupled to the first end of the resistor and the cathode end coupled to the second end of the resistor; and a capacitor having a first end coupled to the first end of the resistor and the anode end of the diode and also having a second end coupled to the source of the first field effect transistor and the drain of the second field effect transistor; and a third reference node operable to receive a control voltage for controlling the first and second field effect transistors, the third reference node coupled to the second end of the resistor and the cathode end of the diode.