Coupling circuit between high impedance piezoelectric signal sou

Details Coupling circuit between high impedance piezoelectric signal sou Coupling circuit between high impedance piezoelectric signal sou

1983-09-06

1984-12-25

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310800, H01L 4108

Patent

active

044906390

ABSTRACT:
The high impedance output of a touch-sensitive piezoelectric sensor is coupled directly to the high impedance input of a CMOS (complementary metal oxide silicon field effect transistor pair). The CMOS is protected on its input side by clamps which restrict the voltage swing applied to the gates to within the range defined by the positive and negative CMOS bias supply (+V.sub.DD and -V.sub.SS). The sensor produces voltages of approximately equal magnitude in response to slow acting temperature changes and quicker acting manual touching. In order to distinguish piezoelectric from pyroelectric signals, the CMOS bias is periodically and briefly shorted, to ensure a brief return-to-zero of the sensor output, thereby effectively suppressing the slow acting pyroelectric signal without interfering with sensing of quick acting piezoelectric signals.

REFERENCES:
patent: 3243792 (1966-03-01), Hamilton
patent: 3899698 (1975-08-01), Kleinschmidt
patent: 3971250 (1976-07-01), Taylor
patent: 4328441 (1982-05-01), Kroeger, Jr. et al.

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