OTA linearization via electronically-programmable current mirrors

Author

Adams, William J. ; Ramirez-Angulo, Jaime

Author_Institution

Texas A&M Univ., College Station, TX, USA

fYear

1991

fDate

11-14 Jun 1991

Firstpage

2553

Abstract

A simple electronically programmable MOS current mirror is presented which provides variable amplification and at the same time improves the linearity of currents generated by a simple differential pair. Analysis of this linearity-improvement/g_m-a scheme is verified experimentally. The combination of a simple differential pair and simple programmable current mirrors has been shown to yield an OTA (operational transconductor amplifier) which allows an additional degree of freedom in g_m adjustment, i.e., a g_m adjustment in a differential-pair-based input stage. It also allows an input signal greater than that which can be obtained from a comparable simple-differential-pair and fixed-current-mirror combination

Keywords

differential amplifiers; field effect transistor circuits; linearisation techniques; operational amplifiers; MOS current mirror; differential pair; electronically-programmable current mirrors; linearity; operational transconductor amplifier; variable amplification; Circuit noise; Degradation; Ear; Linearity; Mirrors; Operational amplifiers; Signal generators; Tail; Transconductance; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1991., IEEE International Sympoisum on

Print_ISBN

0-7803-0050-5

Type

conf

DOI

10.1109/ISCAS.1991.176048

Filename

176048