Effects of transistor nonidealities on log-domain filters

Author

Leung, Vincent W. ; El-Gamal, Mourad ; Roberts, Gordon W.

Author_Institution

Dept. of Electr. Eng., McGill Univ., Montreal, Que., Canada

Volume

1

fYear

1997

fDate

9-12 Jun 1997

Firstpage

109

Abstract

Log-domain filtering makes explicit use of the diode nature of bipolar transistors to realize log-domain integrators, resulting in coupled translinear circuits. In this paper, the departure from ideal integration due to the major transistor nonidealities is studied, and practical filter deviation equations are derived. The device nonidealities to be tackled include: parasitic emitter resistance, finite beta, base resistance and Early effect. SPICE simulations, both large and small-signal analysis, are performed to verify the results. Compensation schemes are also proposed

Keywords

SPICE; active filters; bipolar transistor circuits; integrating circuits; Early effect; SPICE simulation; base resistance; bipolar transistor nonidealities; compensation; coupled translinear circuit; deviation equation; finite beta; large-signal analysis; log-domain filter; log-domain integrator; parasitic emitter resistance; small-signal analysis; Analytical models; Bipolar transistors; Circuit simulation; Coupling circuits; Diodes; Equations; Filtering; Filters; Performance analysis; SPICE;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on

Print_ISBN

0-7803-3583-X

Type

conf

DOI

10.1109/ISCAS.1997.608625

Filename

608625