Balkan Journal of Electrical and Computer Engineering

2147-284X 2147-284X

MUSA YILMAZ

10.17694/bajece.585798

Electrical Engineering

Elektrik Mühendisliği

Nested Miller Compensation Based Op-Amp Design for Piezoelectric Actuators

https://orcid.org/0000-0003-1847-1356

Gokcen

Dincer

Hacettepe University

https://orcid.org/0000-0001-5119-8705

Çelik

Mehmet Akif

Hacettepe University

https://orcid.org/0000-0002-6726-4567

Aydos

Fatih Emre

Hacettepe University

04 30 2020

8 2 186 192 07 02 2019 03 13 2020

2013

Balkan Journal of Electrical and Computer Engineering

This study introduces the design of a practicalthree-stage operational amplifier (op-amp) using nested Miller compensation,particularly for piezoelectric actuators. Driving a piezoelectric actuatorrepresents a challenge in amplifier design due to its large capacitive nature.A stable piezo driver needs to be free of oscillations and phase lag. Directfeedback compensation using a conventional Miller capacitor is an effectivemethod as long as the capacitance of the load is considerably close to thevalue of the Miller capacitor. However, using a large capacitor causes adecrease in the slew rate and gain bandwidth. To avoid this, our design focusedon the utilization of nested Miller compensation technique. A prototype of thedesign working at 100V peak to peak voltage (Vpp) is implementedusing commercial off-the-shelf (COTS) components. The measurements show thesuccessful driving capability and step-response of the op-amp design. In thedesign, Widlar current source is also utilized for thermal stability and shortcircuit protection. According to simulation results, the proposed op-amp has aslew rate of 0.5 V/μs, an open loop gain of 90dB with 3MHz Gain BandwidthProduct (GBP) and phase margin of 77°, and a common mode rejection ratio (CMRR)of 62dB.

Operational Amplifier Stability Piezoelectric Actuator Piezo Driver

Hacettepe University

FAY-2017-14008

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