Leveraged current mirror op amp

Author

Fox, R.M. ; Seo, I. ; Yeo, H. ; Jeon, O.

Author_Institution

Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA

Volume

5

fYear

2002

fDate

2002

Abstract

A small change to the standard current mirror op amp configuration is shown to improve performance, with few, if any, disadvantages. Adding a pair of fixed current sources allows reduced operating-point current in the output stage, while the resulting "leveraging" effect increases slew rate. For equal total power dissipation, the new configuration improves DC gain and gain-bandwidth (GBW) over conventional current-mirror and folded cascode op amps, as shown by hand analyses and SPICE simulations. Also, because of increased input stage transconductance, the new configuration reduces thermal and flicker noise.

Keywords

SPICE; circuit simulation; current mirrors; flicker noise; integrated circuit noise; operational amplifiers; thermal noise; DC gain; SPICE simulations; equal total power dissipation; fixed current sources; flicker noise; gain-bandwidth; input stage transconductance; leveraged current mirror op amp; operating-point current; slew rate; thermal noise; Analytical models; Circuit noise; Clamps; Degradation; Mirrors; Operational amplifiers; Power dissipation; SPICE; Transconductance; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

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

Print_ISBN

0-7803-7448-7

Type

conf

DOI

10.1109/ISCAS.2002.1010635

Filename

1010635