Accession Number : ADD016524
Title : Monolithic Low Noise Preamplifier for Piezoelectric Sensors.
Descriptive Note : Patent, Filed 12 Apr 93, patented 16 Aug 94,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Straw, Timothy B
Report Date : 16 Aug 1994
Pagination or Media Count : 6
Abstract : A preamplifier for a piezoelectric sensor requiring a high-impedance, low noise interface circuit. The preamplifier is a single, monolithic integrated circuit that can be mounted directly onto or inside a miniature sensor without degrading the sensor's performance. The preamplifier performs signal amplification with a full-differential amplifier that includes common-mode feedback back. A pair of feedback capacitors together with the sensor capacitance control the voltage gain of the preamplifier over much of it's useful operating range of 100 Hz to 100 kHz. The preamplifier circuit also has feedback resistors that discharge any accumulated DC voltage which might appear on the capacitors. Also the feedback resistors form a high pass filter which rejects low frequency background noise from the sensor.
Descriptors : *INTEGRATED CIRCUITS, *LOW FREQUENCY, *PREAMPLIFIERS, *MONOLITHIC STRUCTURES(ELECTRONICS), *PIEZOELECTRICITY, AMPLIFICATION, AMPLIFIERS, BACKGROUND NOISE, CAPACITANCE, CAPACITORS, CONTROL, FEEDBACK, FILTERS, FREQUENCY, GAIN, HIGH PASS FILTERS, IMPEDANCE, INTERFACES, LOW NOISE, NOISE, RESISTORS, SIGNALS, VOLTAGE, DETECTORS, PATENTS
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE