Patent ID: 7498862

Claim:
A switch, comprising: (a) first and second terminals; (b) first and second switch transistors connected in series between said first and second terminals, each of said first and second switch transistors being a field effect transistor of a first conductivity type; (c) a first biasing resistor connected between the gate of said first switch transistor and said first terminal; (d) a second biasing resistor connected between the gate of said second switch transistor and said second terminal; and (e) first and second control transistors, each of said first and second control transistors being a field effect transistor of a second conductivity type opposite said first conductivity type, wherein: (i) said first control transistor connects between said gate of said first switch transistor and a reference voltage and with the gate of said first control transistor connected to a control input; and (ii) said second control transistor connects between said gate of said second switch transistor and said reference voltage and with the gate of said second control transistor connected to said control input; wherein said elements are dimensioned, configured and connected so that when one of a logic high or low value is applied at said control input, said first and second control transistors will be rendered conducting to apply said reference voltage as a gate bias to said first and second switch transistors so that said first and second switch transistors will both be rendered in a conducting state to connect said first and second terminals; and when the other of said logic high or low value is applied to said control input, said first and second control transistors will be rendered non-conducting and said gate bias will be determined by voltage at said first and second terminals acting through said first and second biasing resistors to maintain one of said first and second switch transistors in an open state when voltage at said first terminal is higher or lower than voltage at said second terminal, whether or not the polarity of the voltage applied to said first or second terminal is changed.