Quasi Rail-to-Rail Very Low-Voltage OPAMP With a Single pMOS Input Differential Pair

Author

Baez-Villegas, D. ; Silva-Martinez, Jose

Author_Institution

Electr. & Comput. Eng. Dept., Texas A&M Univ., College Station, TX

Volume

53

Issue

11

fYear

2006

Firstpage

1175

Lastpage

1179

Abstract

In this brief, a quasi-rail-to-rail low-voltage operational amplifier (V_DD-V_SS-V_DSATP-V_DSATN) is introduced. A common-mode adapter that uses the common-mode voltage present at the common-source node of the available differential pair to accommodate the large common-mode input signal is proposed. The common-mode adapter operates properly at 300 kHz while driving a load capacitor of 15 pF and employs only 95 muW of static power. The amplifier was fabricated in a standard AMI 0.5-mum CMOS process (V_tn=0.7 V and Vtp=-0.9 V) and achieves an IM3 of - 48 dB at 300 kHz for a two-tone input signal of 0.8 V_pk-pk. A 1-V total supply voltage was used

Keywords

CMOS integrated circuits; integrated circuit design; low-power electronics; operational amplifiers; -0.9 V; 0.5 micron; 0.7 V; 1 V; 15 pF; 300 kHz; 95 muW; CMOS process; common-mode adapter; common-mode circuits; load capacitor; low-voltage amplifiers; low-voltage circuits; operational amplifiers; pMOS input differential pair; rail-to-rail amplifiers; Ambient intelligence; Capacitors; Circuit topology; Differential amplifiers; Feedback circuits; Operational amplifiers; Rail to rail amplifiers; Rail to rail inputs; Rail to rail operation; Voltage; Common-mode adapters; common-mode circuits; low-voltage amplifiers; low-voltage circuits; rail-to-rail amplifiers;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2006.882364

Filename

4012368