A Curvature-Compensated, High Power Supply Rejection CMOS Bandgap Reference for MEMS Micro-Accelerometer

Abstract:

The reference is an important part in the accelerometer system. With the development of science and technology, the request of the performance of accelerometers is increasingly higher and the precision of reference directly affects the performance of accelerometers. Therefore, a reference voltage applicable to accelerometers is presented based on the analysis of basic principles of conventional bandgap reference (BGR) in this paper. A high-order curvature compensation technique, which uses a temperature dependent resistor ratio generated by a high poly resistor and a nwell resistor, effectively serves to reduce temperature coefficient of proposed reference voltage circuit and to a large extent improve its performance. To achieve a high power supply rejection ratio (PSRR) over a broad frequency range, a pre-regulator is introduced to remain the supply voltage of the core circuit of BGR relatively independent of the global supply voltage. The proposed circuitry is designed in standard 2.0μm CMOS process. The simulated result shows that the average temperature coefficient is less than 2ppm/°C in the temperature range from -40 to 120°C. The improvement on temperature coefficient (TC) is about 10 times reduction compared to the conventional approach. And the PSR at DC frequency and 1kHz achieves -107 and -71dB respectively at 9.0V supply voltage.

• Periodical: Key Engineering Materials (Volume 483)
• Pages: 481-486
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.483.481
• Online since: June 2011
• Authors: Xiao Wei Liu, Bing Jun Lv, Peng Fei Wang, Liang Yin, Na Xu
• Keywords: Bandgap Reference, Curvature Compensation, Micro-Accelerometer, PSRR

References

[1] N. Yazdi: Micro-g Silicon Accelerometers With High Performance CMOS Interface Circuitry, Doctor Degree of Philosophy in the University of Michigan(1999).

[2] A. Kourepenis, J. Borenstein, J. Connelly, R. Elliott, P. Ward, M. Weinberg: Performance of MEMS Inertial Sensors, Position Location and Navigation Symposium(1998), p.4: 1-8.

DOI: 10.1109/plans.1998.669861

[3] K. N. Leung, P. K. T Moke, C. Y. Leung: A 2-V 23-μA 5. 3ppm/℃4th-Order Curvature-Compensated CMOS Bandgap Reference, IEEE 2002 Custom Integrated Circuits Conference(2002), pp.457-460.

DOI: 10.1109/cicc.2002.1012875

[4] G. A. Rincon-Mora: Voltage References –From Diodes to Precision High-Order Bandgap Circuits, New York: Wiley, (2002).

[5] A. E. Buck, C. L. McDonald, H. Lewis: A CMOS Bandgap Reference without Resistors, IEEE J Solid-State Circuits(2002), p.37(1): 81.

DOI: 10.1109/4.974548

[6] Q. N. Zhou, Y. S. Wang, M. Y. Yu: A High-PSRR CMOS Bandgap Reference Without Resistor, Journal of Semiconductors(2008), p.29(8).