A reference voltage source and its output buffer for pipeline ADC

Author

Huafeng Cao ; Zongguang Yu ; Honghui Deng ; Peicheng Li

Author_Institution

Sch. of Internet of Things Eng., Hefei Univ. of Technol., Hefei, China

fYear

2014

Firstpage

1

Lastpage

5

Abstract

A design of a reference voltage source and its output buffer circuit for pipeline analog to digital Converter (ADC) which is based on Global Foundry 0.18um 1.8V CMOS mixed signal process is presented in this paper. An improved Brokaw structure is adopted in the key circuit of this current-mode bandgap reference (BGR) to provide a low voltage reference of 0.5V for the design of low supply voltage circuit. The proposed configuration circuit for this voltage reference source can achieve a variety of values by adjusting reference voltage output, and the output buffer circuit will transfer the output voltage into differential reference voltage source for the application of differential input signal in ADC. The simulation results of Spectre show that, the temperature coefficient is 9.3ppm/°C in the range form -40 °C to 125 °C, Power Supply Rejection Ration (PSRR) is 107.3dB, the setting time of output buffer for multiplying digital to analog converter(MDAC) reference voltage and subADC reference voltage is 1.257ns and 1.549ns, separately.

Keywords

CMOS integrated circuits; analogue-digital conversion; reference circuits; Brokaw structure; CMOS mixed signal process; analog to digital converter; current-mode bandgap reference; differential input signal; differential reference voltage source; low supply voltage circuit; low voltage reference; multiplying digital to analog converter reference voltage; output buffer; pipeline ADC; size 0.18 mum; temperature -40 degC to 125 degC; time 1.257 ns; time 1.549 ns; voltage 0.5 V; voltage 1.8 V; Accuracy; Layout; Photonic band gap; Pipelines; Resistors; Simulation; Temperature; bandgap; buffer; configuration circuit; pipeline ADC; reference voltage source;

fLanguage

English

Publisher

ieee

Conference_Titel

Anti-counterfeiting, Security, and Identification (ASID), 2014 International Conference on

Print_ISBN

978-1-4799-7117-6

Type

conf

DOI

10.1109/ICASID.2014.7064973

Filename

7064973