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Simulating the current mirror with a self-heating BJT model

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2 Author(s)
Munro, P.C. ; Electr. Eng., Youngstown State Univ., OH, USA ; Ye, F.-Q.

A Gummel-Poon (GP) BJT (bipolar junction transistor) model that includes self-heating is presented, and a current-mirror circuit is used to show its significance. Self-heating thermal effects are modeled by a simple electrical analog circuit, which also provides BJT junction temperature as part of the CAD solution. Both discrete-BJT and IC mirror circuits are tested. The self-heating model correctly simulates the temperature stability of the IC mirror circuit where the BJTs are in close thermal proximity. For the discrete-BJT circuit, a standard GP model produces errors up to 84% versus 6.1% for the self-heating model

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:26 ,  Issue: 9 )