Non-linear amplifier and non-linear emphasis/deemphasis circuit using the same.

摘要

A non-linear amplifier circuit comprises a low band eliminating filter (12) for receiving an input signal from an input terminal, a logarithmic amplifier (16) and an adder (17) for adding the output signal of this logarithmic amplifier an the input signal with a predetermined polarity relationship to produce an output signal and sending this output signal to an output terminal. The logarithmic amplifier (16) comprises an amplifier (13) for receiving the output signal of the low band eliminating filter, a bidirectional logarithmic element (14) and a resistor (15) coupled in parallel thereto between the input and output terminals of the amplifier.