Title :
A high precision CMOS bandgap reference
Author :
Pan, Kaiyang ; Wu, Jianhui ; Wang, Pei
Author_Institution :
Southeast Univ., Nanjing
Abstract :
A high precision bandgap reference is presented. An exponential curvature compensation technique, which exploits the Ic-Vbe temperature characteristic of BJTs, is used to reduce the temperature coefficient (TC). A pre-regulator circuit is adopted to enhance the PSRR (power supply rejection ratio) performance. The bandgap uses the current mode approach to generate a reference voltage around 500 mV. With the conventional first-order compensation, the temperature coefficient is 14.6 ppm/degC over the range from -40degC to 85degC. Due to curvature compensation, an improved temperature drift of 7.04 ppm/degC is obtained. The PSRR of the reference voltage achieves 120 dB at low frequency.
Keywords :
CMOS integrated circuits; compensation; reference circuits; voltage regulators; current mode approach; enhanced PSRR performance; exponential curvature compensation; high precision CMOS bandgap reference; improved temperature drift; pre-regulator circuit; reference voltage; temperature characteristic; temperature coefficient; Application specific integrated circuits; Operational amplifiers; Photonic band gap; Power engineering and energy; Power supplies; Regulators; Systems engineering and theory; Temperature distribution; Voltage; Voltage-controlled oscillators; Bandgap Reference; Compensation; Curvature; Voltage Regulator;
Conference_Titel :
ASIC, 2007. ASICON '07. 7th International Conference on
Conference_Location :
Guilin
Print_ISBN :
978-1-4244-1132-0
Electronic_ISBN :
978-1-4244-1132-0
DOI :
10.1109/ICASIC.2007.4415725
