Preamplifier With Adjustable Input Resistance.
Patent Application, Filed 1 Jun 92,
DEPARTMENT OF THE ARMY WASHINGTON DC
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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.
- Electrical and Electronic Equipment