Temperature Compensation Of BJT Differential
Amplifiers
by Dennis L. Feucht
Innovatia Laboratories
The bipolar junction transistor (BJT) emitter-coupled differential-pair
circuit is a familiar amplifier stage in the repertoire of analog designers,
but has a surprising obscurity that needs to be revealed. This TechNote
examines the emitter-circuit current source, I0, of BJT diff-amps and the
effects on amplifier gain of different implementations for it.
The widespread belief that a BJT current source can temperature-compensate the diff-amp is true, but the conditions for it do not appear to be widely known, based on most designs.
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