Single-point-detection slew-rate enhancement circuits for single-stage amplifiers

Author

Lee, Hoi ; Mok, Philip K T

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., China

Volume

2

fYear

2002

fDate

2002

Abstract

Most slew rate enhancement circuits can either be used in current-mirror amplifiers or folded-cascode amplifiers, but not in both. In this paper, a new class of slew rate enhancement (SRE) circuits is proposed. By using a single-point detection (SPD) technique at the active load device of the core amplifier to sense the fast signal transient, the new SRE circuits can be used in both current-mirror and folded-cascode amplifiers. In addition, the simple SRE circuits serve as a plug-in feature to the core amplifier and do not affect its original small-signal frequency response. Implemented by an AMS 0.6 μm CMOS process, the current-mirror amplifier with SRE circuit occupies an area of 0.027 mm² and achieves 1.5 V/μs slew rate with 470 pF capacitive load while only dissipating 90 μA total static current. Similarly, the folded-cascode amplifier with SRE circuit occupies an area of 0.03 mm² and achieves 1.52 V/μs slew rate with 470 pF loading while only 84 μA total static current is dissipated.

Keywords

CMOS analogue integrated circuits; amplifiers; current mirrors; integrated circuit design; integrated circuit measurement; transient response; 0.6 micron; 470 pF; 84 muA; 90 muA; AMS 0.6 μm CMOS process; area occupation; capacitive load; core amplifier active load device; current-mirror amplifier; fast signal transient sensing; folded-cascode amplifier; plug-in feature; single-point-detection slew-rate enhancement circuits; single-stage amplifiers; small-signal frequency response; total static current dissipation; CMOS process; Current supplies; Differential amplifiers; Frequency response; Low voltage; MOS devices; Operational amplifiers; Signal detection; Switched capacitor circuits; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on

Conference_Location

Phoenix-Scottsdale, AZ

Print_ISBN

0-7803-7448-7

Type

conf

DOI

10.1109/ISCAS.2002.1011482

Filename

1011482