| 摘要 |
An amplifier circuit including two general purpose operational amplifiers is disclosed. The output terminals of first and second operational amplifiers are connected via first and second resistors in series. A connection point between the first and second resistors is connected to an output terminal and is also connected to an inverting input terminal of the first operational amplifier via a feedback loop. Thus, the first and second operational amplifiers work as class-A amplifier, so that the crossover distortion is prevented from being generated. An input signal is inputted to a non-inverting input terminal of the first operational amplifier wherein the input signal is amplified. The amplified input signal is added with a dc bias voltage and is supplied to a non-inverting input terminal of the second operational amplifier. The output voltage of the first operational amplifier varies in a positive voltage area, and the output voltage of the second operational amplifier varies in a negative voltage area. Thus, an output signal of which distortion factor is relatively small is produced at the output terminal.
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