Logarithmic detection power law circuit

Published:2011/7/4 7:15:00 Author:John | Keyword: detection power law | From:SeekIC

Logarithmic detector is composed of multi-stage logarithmic amplifiers and its circuit is as shown. A total of five logarithmic amplifiers (A ~ E) are shown in the figure. Gain of each logarithmic amplifier is 20dB (that is five times more of the voltage amplification factor). Its maximum output voltage is limited to 1V. Therefore, the slope value of the logarithmic amplifier is ks = 1V/20dB = 50mV/dB. The output voltage of five pairs of logarithmic amplifier is sent to the summing device (Σ) after respectively though the detector. At the end, the voltage is passing through the low-pass filter to output the voltage Uo.



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