Patent ID: 6057737
Filing Date: 2000-05-02
Classification: H03F,H03G

Abstract:
An audio amplifier having an input for producing a first output current including harmonics of the input signal comprisinga first non-linear means having first, second, and third non-linear terminals for receiving said input on said first non-linear terminal, for producing said first output on said second terminal, and for controlling the flow of current from said second non-linear terminal to said third non-linear terminal as a function of the voltage from said first non-linear terminal to said third non-linear terminal;a first resistive means connected to said third non-linear terminal that determines the operating point of said first non-linear means;a first terminal of a capacitive network also connected to said third non-linear terminal;a second non-linear means connected to a second terminal of said capacitive network; anda second resistive means connected to said second terminal of said capacitive means and second non-linear means that determines the operating point of said second non-linear means; whereinsaid second non-linear means has a non-linear characteristic fundamentally different from the non-linear characteristic of said first non-linear means so that said first and second non-linear characteristics do no significantly cancel the even harmonic production of said first or second non-linear means; and whereinthe transductance ratio of said current flow to the input voltage of said input is higher at audio frequencies than at D.C.