High common mode relay multiplexer

Details High common mode relay multiplexer High common mode relay multiplexer

1978-02-23

1979-04-10

Robinson, Thomas A.

179 15A, H04J 304

Patent

active

041490371

ABSTRACT:
A relay multiplexer for low level analog signals is disclosed. To provide a low cost system, inexpensive reed type relays are used. Such relays provide a high capacitive coupling from the relay contacts to the relay coil and thereby degrade the AC common mode rejection of the multiplexer. Common mode rejection is enhanced in accordance with the disclosure by (1) using an optical coupling to the relay switch and (2) slaving a floating relay power supply to the guard potential of the selected channel.

REFERENCES:
patent: 3249883 (1966-05-01), Berneike et al.
patent: 3346698 (1967-10-01), Bradford
patent: 3598922 (1971-08-01), Ainsworth
patent: 3935385 (1976-01-01), Thun

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