Nested Miller Compensation Based Op-Amp Design for Piezoelectric Actuators
Open Access
- 30 April 2020
- journal article
- Published by Balkan Journal of Electrical & Computer Engineering (BAJECE) in Balkan Journal of Electrical and Computer Engineering
- Vol. 8 (2), 186-192
- 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 (Vpp) 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
This publication has 14 references indexed in Scilit:
- Frequency Tuning Technique of Piezoelectric Ultrasonic Transducers for Ranging ApplicationsJournal of Microelectromechanical Systems, 2018
- Simple, low-noise piezo driver with feed-forward for broad tuning of external cavity diode lasersReview of Scientific Instruments, 2018
- A 10 V Fully-Integrated Switched-Mode Step-up Piezo Drive Stage in $0.13\,\upmu\text{m} $ CMOS Using Nested-Bootstrapped Switch CellsIEEE Journal of Solid-State Circuits, 2016
- Piezoelectric micro-lens actuatorSensors and Actuators A: Physical, 2015
- A High-Voltage Class-D Power Amplifier With Switching Frequency Regulation for Improved High-Efficiency Output Power RangeIEEE Journal of Solid-State Circuits, 2015
- A serial-kinematic nanopositioner for high-speed atomic force microscopyReview of Scientific Instruments, 2014
- Development and Active Disturbance Rejection Control of a Compliant Micro-/Nanopositioning Piezostage With Dual ModeIEEE Transactions on Industrial Electronics, 2013
- Development of a High-Bandwidth XY Nanopositioning Stage for High-Rate Micro-/NanomanufacturingIEEE/ASME Transactions on Mechatronics, 2010
- Design and Performance of Inkjet Print Heads for Non-Graphic-Arts ApplicationsMRS Bulletin, 2003
- Tactile measuring systems for the recognition of unknown surfacesIEEE Transactions on Instrumentation and Measurement, 2002