A Telemetry And Interface Circuit For Piezoelectric Sensors

Kavita Nair,Ramesh Harjani

ISCAS '99: PROCEEDINGS OF THE 1999 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOL 5: SYSTEMS, POWER ELECTRONICS, AND NEURAL NETWORKS（1999）

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摘要

In this paper we present a design for a two-wire telemetry and signal conditioning circuit for piezoelectric sensors. The telemetry system uses an on-chip voltage regulator as part of the signal-vs-supply filter. We also introduce a new shielded-base bipolar opamp design that exploits the properties of both MOS and bipolar transistors. The new design results in 10X reduction in power for a 10dB reduction in signal-to-noise ratio. For this design the bandwidth of interest is 10KHz to 1MHz and the sensor capacitance size is 100pF.

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关键词

circuits,signal to noise ratio,bipolar transistors,telemetry,bipolar transistor,chip,piezoelectric sensor,voltage regulators,bandwidth,piezoelectric sensors,voltage,system on a chip,voltage regulator

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