Q. How to provide saturation current and temperature compensation in log-amp?

A
Applying input and reference voltage to separate log-amps
B
Applying reference voltage alone to two different log-amps
C
Applying input and reference voltage to same log-amps
D
None of the mentioned
Solution:

The emitter saturation current varies from transistor to transistor with temperature. Therefore, the input and reference voltage are applied to separate log-amps and two transistors are integrated close together in the same silicon wafer. This provides a close match of the saturation currents and ensures good thermal tracking.

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