Abstract An electronic switch having three identical metal oxide semiconductor field effect transistors (MOS-FET''s), to replace a mechanical relay. The sources of the first and second MOS-FET''s are connected together as a common input, and their drains constitute first and second outputs. The gates of the first and third MOS-FET''s are connected to a common control point. Normally the second MOS-FET is biased on and the first and third are off, connecting the input to the second output. Application of a voltage to the control point turns the first and third MOS-FET''s on, and a circuit through the third MOS-FET shunts the bias voltage applied to the second MOS-FET, shutting the latter off. This disconnects the input from the second output and connects it instead to the first output. For additional outputs, the first and second MOS-FET''s are each replaced by several MOS-FET''s in parallel.
An electronic switch according to claim 1 including a plurality of said first switch means having their control inputs connected together, and a plurality of said second switch means having their control inputs connected together, one second switch means associated with each first switch means, the signal inputs of corresponding first and second switch means being connected together.
Claim 2
Dependent Claim
44 words
An electronic switch according to claim 1 wherein said first and second switch means are field effect transistors, said control inputs being the gates of said transistors, said gate of each transistor being insulated from the signal input and signal output of such transistor.
Claim 3
Dependent Claim
71 words
An electronic switch according to claim 3 wherein the gates of said transistors are connected together and to a common control point, said transistors being of conductivity types such that one assumes its on state, and the other its off state when a predetermined voltage is applied to said control point, and such that the states of said transistors reverse when a second predetermined voltage is applied to said control point.
Claim 4
Dependent Claim
29 words
An electronic switch according to claim 1 wherein said first, second and third switch means are each metal oxide semiconductor field effect transistors of the same mode of operation.
Claim 5
Dependent Claim
33 words
A switch according to claim 1 wherein said first, second and third switch means are metal oxide semiconductor field effect transistors of the same mode of operation and of the same conductivity type.
Claim 6
Dependent Claim
62 words
An electronic switch according to claim 1 wherein said first and second switch means are light sensitive devices having their on state when exposed to light and their off state when shielded from liGht, the control input of each said device including a light generating source, and optical path means extending between said light sensitive device and its associated light generating source.