Papers › An ultra-low noise, high-voltage piezo driver
An ultra-low noise, high-voltage piezo driver
N. C. Pisenti, A. Restelli, B. J. Reschovsky, D. S. Barker, G. K. Campbell
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We present an ultra-low noise, high-voltage driver suited for use with piezoelectric actuators and other low-current applications. The architecture uses a flyback switching regulator to generate up to 250V in our current design, with an output of 1 kV or more possible with small modifications. A high slew-rate op-amp suppresses the residual switching noise, yielding a total RMS noise of ≈100μV (1 Hz--100 kHz). A low-voltage (±10V), high bandwidth signal can be summed with unity gain directly onto the output, making the driver well-suited for closed-loop feedback applications. Digital control enables both repeatable setpoints and sophisticated control logic, and the circuit consumes less than 150mA at ±15V.
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