Title :
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
fDate :
Nov. 30 2008-Dec. 3 2008
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;
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
DOI :
10.1109/APCCAS.2008.4746241
