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A telemetry and interface circuit for piezoelectric sensors

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 10/spl times/ reduction in power for a 10 dB reduction in signal-to-noise ratio. For this design the bandwidth of interest is 10 kHz to 1 MHz and the sensor capacitance size is 100 pF.