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Related Experiment Video

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Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

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Design of a Bandgap Reference Circuit for MEMS Integrated Accelerometers.

Wenbo Zhang¹, Shanshan Wang², Yihang Wang³

¹School of Astronautics, Harbin Institute of Technology, Harbin 150001, China.

|November 27, 2025

Summary

This study introduces a novel operational amplifier (op-amp) circuit for integrated accelerometers, offering high precision reference voltage, wide voltage range, and low power consumption. The design achieves excellent performance metrics, balancing drive capability with stability for demanding applications.

Keywords:

bandgap reference class-AB buffer integrated accelerometers low-power operational amplifier noise suppression

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Area of Science:

Electrical Engineering
Microelectronics
Analog Circuit Design

Background:

Integrated accelerometers require stable, high-precision reference voltages.
Existing designs often struggle to balance wide supply voltage ranges, high current drive, and low power consumption.
CMOS/BiCMOS technology presents opportunities for advanced circuit solutions.

Purpose of the Study:

To propose and validate a novel bandgap reference operational amplifier (op-amp) circuit.
To meet stringent requirements for integrated accelerometers, including wide supply voltage, high current drive, and low power.
To demonstrate engineering practicality and broad applicability in sensor systems.

Main Methods:

Implementation of a CMOS/BiCMOS op-amp circuit.
Utilizing a folded-cascode input stage and a Class-AB output stage.
Incorporating adaptive output switching, composite frequency compensation, overcurrent protection, and noise suppression techniques.

Main Results:

Achieved output swing of 0.2 V~2.8 V with a low-frequency gain of 102~118 dB.
Demonstrated a Power Supply Rejection Ratio (PSRR) of 90 dB at 60 Hz and overcurrent protection of ±25 mA.
Maintained static current below 150 μA across the supply range, with line/load regulation better than 150 μV/V and 150 μV/mA, respectively.

Conclusions:

The proposed op-amp design successfully balances high drive capability and stability under strict power constraints.
The circuit is well-suited as a bandgap reference buffer stage for integrated accelerometers.
The design exhibits strong engineering practicality and potential for widespread application in microelectronic systems.