Monolithic low noise preamplifier for piezoelectric sensors

Details Monolithic low noise preamplifier for piezoelectric sensors Monolithic low noise preamplifier for piezoelectric sensors

1993-04-12

1994-08-16

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

330258, H04B 106, H03F 345

Patent

active

053392850

ABSTRACT:
A preamplifier for a piezoelectric sensor requiring a high-impedance, low ise 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. 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.

REFERENCES:
patent: 4667165 (1987-05-01), De Weck
patent: 4689578 (1987-08-01), Spychalski
patent: 4906943 (1990-03-01), Koch
patent: 5084639 (1992-01-01), Ribner

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