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Question Bank (2 marks) · Q16

Q.Draw the circuit diagram of an anti logarithmic amplifier.

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[!TLDR]

Swap the log amp's diode and resistor: with the diode at the input and RR as feedback, Vo∝−antilog(Vin)V_o \propto -\text{antilog}(V_{in}).

Here the input voltage sets an exponential diode current I=IseVin/ηVTI = I_s e^{V_{in}/\eta V_T}. This current flows through the feedback resistor RR, so Vo=−RIseVin/ηVTV_o = -R I_s e^{V_{in}/\eta V_T}. The output is therefore proportional to the antilogarithm (exponential) of the input. Antilog amplifiers reverse the compression of a log amplifier and are …

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