Title :
A novel bandgap reference for minimizing current-mirror mismatch
Author :
Sizhen, Li ; Xuecheng, Zou ; Kai, Yu ; Hao, Zhang ; Shuangxi Lin
Author_Institution :
Dept. of Electron. Sci.&Technol., Huazhong Univ. of Sci.&Technol., Wuhan, China
Abstract :
A novel bandgap reference for minimizing 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. Moreover, the voltage variations caused by temperature and supply voltage changes which make the small-signal current in the bandgap core vary can also be minimized. Based on the 0.6 um 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 2.3 ppm/°C and a high power supply rejection ratio (PSRR) of 72 db without any PSRR boosting technique. On typical working conditions, the proposed circuit consumes only a supply current of 3.6 uA.
Keywords :
BiCMOS analogue integrated circuits; current mirrors; integrated circuit design; low-power electronics; reference circuits; BiCMOS process technology; PSRR; bandgap voltage reference design; current 3.6 muA; current path self-compensation; current-mirror mismatch minimization; power supply rejection ratio; size 0.6 mum; small-signal current variations; temperature coefficient; BiCMOS integrated circuits; Boosting; Integrated circuit modeling; Mirrors; Operational amplifiers; Photonic band gap; Power supplies; Resistors; Temperature; Voltage;
Conference_Titel :
Solid-State and Integrated-Circuit Technology, 2008. ICSICT 2008. 9th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2185-5
Electronic_ISBN :
978-1-4244-2186-2
DOI :
10.1109/ICSICT.2008.4734901
