Simple CMOS analog square-rooting and squaring circuits

Author

Filanovsky, I.M. ; Baltes, H.P.

Author_Institution

Dept. of Electr. Eng., Alberta Univ., Edmonton, Alta., Canada

Volume

39

Issue

4

fYear

1992

fDate

4/1/1992 12:00:00 AM

Firstpage

312

Lastpage

315

Abstract

Two closely related CMOS circuits are described. In the first circuit, the input signal is a current, and the output is a voltage proportional to the square root of input current. In the second circuit, the input is a voltage, and the output is the current proportional to the square of the input voltage. Each circuit includes an operational amplifier and two nested transistors. One of these transistors is in pinch-off, the other in the triode region of operation. The transistor mismatch and the effect of the amplifier offset are evaluated. The experimental data are provided

Keywords

CMOS integrated circuits; analogue computer circuits; linear integrated circuits; operational amplifiers; CMOS circuits; amplifier offset; nested transistors; operational amplifier; square-rooting; squaring circuits; transistor mismatch; CMOS analog integrated circuits; Circuit stability; Differential equations; Filters; Polynomials; Robust stability; Robustness; Stability criteria; Sufficient conditions; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on

Publisher

ieee

ISSN

1057-7122

Type

jour

DOI

10.1109/81.129463

Filename

129463