A precise bandgap reference with intrinsic compensation for current-mirror mismatch

Author

Li, Sizhen ; Zou, Xuecheng ; Chen, Xiaofei ; Zou, Zhige ; Yu, Kai ; Zhang, Hao

Author_Institution

Dept. of Electron. Sci. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan

fYear

2008

fDate

Nov. 30 2008-Dec. 3 2008

Firstpage

1200

Lastpage

1203

Abstract

A precise bandgap reference with intrinsic compensation for current-mirror mismatch is presented. In the proposed circuit, the small-signal current variations in the two current paths are self-compensated while in the conventional bandgap core they are multiplied. As a result, error caused by current-mirror mismatch has been much reduced in the proposed circuit. Precise and simple models are developed for error analysis. The complete circuit has also been presented which features simplicity, high accuracy and low power. Based on the 0.6 mum BiCMOS process technology, the error caused by current-mirror mismatch has been reduced by about 50 times in the proposed bandgap core and the complete circuit achieves a low temperature coefficient of 3.8 ppm/degC and a high power supply rejection ratio (PSRR) of 92 dB. On typical working conditions, the proposed circuit consumes only a supply current of 3 muA.

Keywords

BiCMOS integrated circuits; error analysis; BiCMOS process technology; current-mirror mismatch; error analysis; high power supply rejection ratio; intrinsic compensation; precise bandgap reference; small-signal current variations; BiCMOS integrated circuits; Current supplies; Employee welfare; Error analysis; Integrated circuit modeling; Mirrors; Photonic band gap; Power supplies; Temperature; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on

Conference_Location

Macao

Print_ISBN

978-1-4244-2341-5

Electronic_ISBN

978-1-4244-2342-2

Type

conf

DOI

10.1109/APCCAS.2008.4746241

Filename

4746241