A NOVEL-APPROACH TO THE CALCULATION OF NONLINEAR HARMONIC DISTORTION COEFFICIENTS IN BJT DIFFERENTIAL-AMPLIFIERS


CICEKOGLU O., KUNTMAN H.

MICROELECTRONICS JOURNAL, vol.25, no.4, pp.293-299, 1994 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 4
  • Publication Date: 1994
  • Doi Number: 10.1016/0026-2692(94)90179-1
  • Title of Journal : MICROELECTRONICS JOURNAL
  • Page Numbers: pp.293-299

Abstract

The base-driven BJT differential pair is analysed, taking the Early effect into consideration and using a different model. Harmonic distortion coefficients are calculated and an accurate analytical expression representing the total harmonic distortion is proposed. It is shown that this expression leads to a minimum point in total harmonic distortion which cannot be obtained with the SPICE modified Gummel-Poon model that underestimates the contribution of the Early effect, and therefore accurate simulation by SPICE is not possible.