Accession Number : ADD015377

Title :   Preamplifier With Adjustable Input Resistance.

Descriptive Note : Patent Application, Filed 1 Jun 92,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Straw, Timothy B ; Murphy, Patricia G

Report Date : 01 Jun 1992

Pagination or Media Count : 14

Abstract : The present invention overcomes the above briefly discussed deficiencies and other disadvantages of the prior art and, in so doing, employs a metal oxide semiconductor field effect transistor operated in the triode region to approximate a linear input resistance for a preamplifier employed with a capacitive transducer. The present invention thus encompasses the unobvious use of a device known to be non-linear in an application where the prior art has universally attempted to achieve linearization. The invention is based upon the discovery that the distortion of an amplified capacitive transducer output signal can be maintained within an acceptable range when the capacitive transducer and a non-linear MOSFET resistance combine to form a high-pass filter which, in effect, masks non-linearities.

Descriptors :   *PREAMPLIFIERS, TRANSDUCERS, RESISTANCE, LINEARITY, INTEGRATED CIRCUITS, PATENT APPLICATIONS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE