Feasibility study of current mode differential amplifier design

Author

Goldminz, Lavy ; Arbel, Arie F.

Author_Institution

Fac. of Electr. Eng., Technion, Haifa, Israel

Volume

6

fYear

1992

fDate

10-13 May 1992

Firstpage

2856

Abstract

A new class of current mode amplifiers, designed to operate in a true current-mode environment, is introduced. They utilize the FCS (floating current source), a novel current-mode building block, in various configurations. Two current-mode differential amplifiers of this type are described. The first one employs two translinear gain stages. The CM (common mode) response is reduced by a negative feedback loop responding to the CM only. The translinear gain can be adjusted by varying the value of two current source pairs in unison. The second is a differential feedback amplifier, employing two independent feedback loops which apply parallel feedback to the input virtual ground, one for the differential and another for the common mode. Its input admittance and output impedance are both increased significantly by the feedback applied

Keywords

constant current sources; differential amplifiers; feedback; FCS; common-mode response; current mode differential amplifier design; current source pairs; differential feedback amplifier; floating current source; input admittance; negative feedback loop; output impedance; parallel feedback; translinear gain; translinear gain stages; Admittance; Circuits; Differential amplifiers; Feedback amplifiers; Feedback loop; Impedance; Negative feedback loops; Operational amplifiers; Output feedback; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on

Conference_Location

San Diego, CA

Print_ISBN

0-7803-0593-0

Type

conf

DOI

10.1109/ISCAS.1992.230604

Filename

230604