A band-gap voltage reference for interface circuit of microsensor

CAO Yi-jiang, XiaoFei, ZHANG Er-dong

Dept. of Electronic Science and Technology,College of Applied Science,Harbin University of Science and Technology,Harbin 150080, China



Abstract:

A high performance CMOS band-gap voltage reference circuit that can be used in interface integrated circuit of microsensor and compatible with 0. 6 μm ( double poly) mix process is proposed in this paper. The circuit can be employed in the range of 1. 8 - 8 V and carry out the first-order PTAT ( proportional to absolute temperature) temperature compensation. Through using a two-stage op-amp with a NMOS input pair as a negative feedback op-amp,the PSRR ( power supply rejection ratio) of the entire circuit is increased,and the temperature coefficient of reference voltage is decreased. Results from HSPICE simulation show that the PSRR is - 72. 76 dB in the condition of low-frequency,the temperature coefficient is 2. 4 × 10 -6 in the temperature range from - 10 ℃ to 90 ℃ and the power dissipation is only 14 μW when the supply voltage is 1. 8 V.

Key words:  microsensor  band-gap voltage reference  temperature coefficient  PSRR

DOI：10.11916/j.issn.1005-9113.2010.04.011

Clc Number:TM464

Fund: