Title: High common mode relay multiplexer

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.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Langan, Marion J. (Huntsville, AL, US)

Application Number: 880512
Filing Date: 1978-02-23
Publication_date: 1979-04-10
Assignee: Avco Corporation (Greenwich, CT)
Primary Class(es): 370/532
Other Classes:
US Patent Ref:

3249883	May, 1966	Berneike et al.	179/15.
3346698	Oct, 1967	Bradford	179/15.
3598922	Aug, 1971	Ainsworth	179/15.
3935385	Jan, 1976	Thun	179/15.

Other Refs:
Primary Examiner: Robinson, Thomas A.
Assistant Examiner:
Attorney: Garfinkle; Irwin P.