A High Precise Reference for SAR ADC

Author

Xueping, Zhou ; Li, Luo ; Xuelian, Gao

Author_Institution

Beijing Jiaotong Univ., Beijing

fYear

2007

Abstract

A high precise bandgap is proposed and applied to a successive approximation register (SAR) analog-to-digital converter (ADC) used in the touch screen control system, which has a significant requirement of stability. Thus a lot of efforts were put into improving the precision and the reliability of the reference. As results, a high precise CMOS bandgap voltage reference circuit which is compatible with SMIC 0.35mum CMOS technology is proposed. The error sources in bandgap voltage reference are analyzed, and the precise mathematical expressions and the corresponding improvement methods are presented. The results show that the temperature coefficient is 16.9 ppm/degC over -40~85degC and the power supply rejection ratio is -71dB at 100 Hz.

Keywords

CMOS integrated circuits; analogue-digital conversion; reference circuits; touch sensitive screens; CMOS technology; SAR ADC; SMIC; analog-digital converter; bandgap voltage reference circuit; frequency 100 Hz; high precise bandgap reference; reliability; size 0.35 mum; stability; successive approximation register; temperature -40 C to 85 C; touch screen control system; Analog-digital conversion; CMOS technology; Circuits; Consumer electronics; Control systems; Instruments; Photonic band gap; Power supplies; Temperature; Voltage; PSRR; SAR ADC; bandgap reference; high precise; temperature coefficient;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on

Conference_Location

Xi´an

Print_ISBN

978-1-4244-1136-8

Electronic_ISBN

978-1-4244-1136-8

Type

conf

DOI

10.1109/ICEMI.2007.4350508

Filename

4350508