Input resistances of the single-input active-load differential amplifier

Author

Glas, Gregorio Oscar ; Zola, Julio Guillermo

Author_Institution

Fac. of Eng., Buenos Aires Univ., Argentina

Volume

41

Issue

1

fYear

1994

fDate

1/1/1994 12:00:00 AM

Firstpage

60

Lastpage

63

Abstract

In a current mirror-loaded differential amplifier stage with bipolar transistors in low frequency, the resistances as seen from the inverting and noninverting inputs are different. This occurs although the circuit is perfectly balanced in currents, and identical transistors in the pair and the current mirror source are assumed. Simple expressions of the resistances from each input are obtained, which show a strong dependence on the Early voltage of the circuit devices

Keywords

circuit analysis computing; differential amplifiers; nonlinear network analysis; Early voltage; bipolar transistors; circuit analysis; computer simulation; current mirror-loaded differential amplifier stage; input resistance; inverting input; noninverting input; resistively loaded emitter coupled pair; single-input active-load differential amplifier; Chaos; Circuit synthesis; Control system synthesis; Differential amplifiers; Nonlinear equations; Nonlinear systems; Output feedback; Poles and zeros; State-space methods; Transfer functions;

fLanguage

English

Journal_Title

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

Publisher

ieee

ISSN

1057-7122

Type

jour

DOI

10.1109/81.260223

Filename

260223