A High-Precision, Low Offset Voltage, Delay Stability Comparator

Author

Jing Yang ; Quanyuan Feng

Author_Institution

Inst. of Microelectron., Southwest Jiaotong Univ., Chengdu, China

Volume

1

fYear

2013

fDate

26-27 Aug. 2013

Firstpage

466

Lastpage

469

Abstract

Comparators are widely used in DC/DC converters, some major design challenges are capabilities of the comparators to operate accurately, stably at all conditions. This paper proposes a voltage comparator circuit Based on 0.5μm BiCMOS process. In order to work stable in all temperatures, two kinds of temperature coefficient bias current are used, one is for BJT differential pair, and another is for CMOS differential pair. By using three-level amplifier and the special output stage to get a voltage gain of 123dB. The maximum voltage gain variation is 4dB which is fluctuated within 1.7% when the temperature from-40°C to 125°C. Compared with conventional PWM comparators, its advantages are fast response, low offset voltage, and delay stability. The proposed comparator is applied to a buck converter.

Keywords

BiCMOS analogue integrated circuits; DC-DC power convertors; amplifiers; comparators (circuits); BJT differential pair; BiCMOS process; CMOS differential pair; DC/DC converters; PWM comparators; buck converter; delay stability comparator; gain 123 dB; gain 4 dB; low offset voltage; maximum voltage gain variation; size 0.5 mum; temperature -40 C to 125 C; temperature coefficient bias current; three level amplifier; voltage comparator circuit; BiCMOS integrated circuits; Circuit stability; Delays; Gain; MOS devices; Thermal stability; BiCMOS analog integrated circuits; comparator; high-speed integrated circuits; low offset voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Human-Machine Systems and Cybernetics (IHMSC), 2013 5th International Conference on

Conference_Location

Hangzhou

Print_ISBN

978-0-7695-5011-4

Type

conf

DOI

10.1109/IHMSC.2013.117

Filename

6643929