High-performance drive circuitry for capacitive transducers

Details High-performance drive circuitry for capacitive transducers High-performance drive circuitry for capacitive transducers

2005-11-01

2005-11-01

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

Reexamination Certificate

active

06960945

ABSTRACT:
Drive circuitry for capacitive displacement transducers includes an oscillator, a precision low noise voltage reference with added noise reduction circuitry, a synchronous demodulator consisting of a single pole double throw analog switch, one or more transducer electrode drive signals generated by one or more additional analog switches, and feedback circuitry to modify the amplitude of the electrode drive signal based on the circuit output signal, to improve the accuracy of the output signal.

REFERENCES:
patent: 4584885 (1986-04-01), Cadwell
patent: 5343766 (1994-09-01), Lee

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