Compact CMOS analog crosspoint switch matrix

Claim 1

A semiconductor crosspoint switch for switching each of a plurality of first terminals of a matrix of terminals to a plurality of second terminals of said matrix of terminals, comprising an integrated circuit comprised of a series of more than two field effect transistors (FETs) of similar conductivity type each formed of a pair of impurity diffused regions separated by a channel region underlying an insulated gate, pairs of FETs sharing adjacent diffused regions, the number of diffused regions being equal to twice a larger number of the first and second terminals plus one, each terminal of said larger number of the first and second terminals being respectively connected in sequence to a corresponding even numbered diffused region, each terminal of a pair of the smaller number of the first and second terminals being connected to alternate odd numbered diffused regions respectively, and means for applying a switching signal to a gate of a transistor to which a first and a second terminal are connected whereby an FET having said gate can conduct, thereby connecting the first terminal and the second terminal connected to said FET together.