Browse Prior Art Database

Low Resistance Precision Analog Switch

IP.com Disclosure Number: IPCOM000089027D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Olsen, FW: AUTHOR

Abstract

Sensitive test systems have a need for a high current, low noise, low on resistance, no offset, fast response, and low leakage floating analog switch.

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Low Resistance Precision Analog Switch

Sensitive test systems have a need for a high current, low noise, low on resistance, no offset, fast response, and low leakage floating analog switch.

In meeting these requirements, the present switch makes use of an N- channel low resistance FET E105, which has an FET amplifier voltage follower circuit 10 tied to its source S to serve as a source of reference for the low resistance FET gate G. The FET gate is driven by a differential reference isolator amplifier 11 so that any analog voltage on the FET source can be translated as though it were to ground. With the amplifiers powered up, the FET is electrically open until the unloaded transistor collector input is pulled down to ground. The FET switches electrically on when its gate voltage is equal to its source voltage or drain voltage.

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