Nested Miller Compensation Based Op-Amp Design for Piezoelectric Actuators

Year 2020, Volume: 8 Issue: 2, 186 - 192, 30.04.2020

Dincer Gokcen Mehmet Akif Çelik Fatih Emre Aydos

https://doi.org/10.17694/bajece.585798

Abstract

This study introduces the design of a practical
three-stage operational amplifier (op-amp) using nested Miller compensation,
particularly for piezoelectric actuators. Driving a piezoelectric actuator
represents a challenge in amplifier design due to its large capacitive nature.
A stable piezo driver needs to be free of oscillations and phase lag. Direct
feedback compensation using a conventional Miller capacitor is an effective
method as long as the capacitance of the load is considerably close to the
value of the Miller capacitor. However, using a large capacitor causes a
decrease in the slew rate and gain bandwidth. To avoid this, our design focused
on the utilization of nested Miller compensation technique. A prototype of the
design working at 100V peak to peak voltage (V_pp) is implemented
using commercial off-the-shelf (COTS) components. The measurements show the
successful driving capability and step-response of the op-amp design. In the
design, Widlar current source is also utilized for thermal stability and short
circuit protection. According to simulation results, the proposed op-amp has a
slew rate of 0.5 V/μs, an open loop gain of 90dB with 3MHz Gain Bandwidth
Product (GBP) and phase margin of 77°, and a common mode rejection ratio (CMRR)
of 62dB.

Keywords

Operational Amplifier, Stability, Piezoelectric, Actuator, Piezo Driver

Supporting Institution

Hacettepe University

Project Number

FAY-2017-14008

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