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Logarithmic Amplifier

The log and antilog amplifiers  are nonlinear circuits where the output voltage is proportional to the exponent or logarithm of input voltage. Usually, to perform multiplication and division in electronic circuits, addition and subtraction of logs are used. The other applications of log amplifiers are powers, roots, compression, decompression, true rms detection and process control, etc. There are two basic circuits of logarithmic amplifiers such as

  • Diode-connected transistor
  • Transdiode

Logarithmic amplifier


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