| 摘要 |
A power amplifier circuit with less harmonic distortion factor and with remarkably high slew rate consists of a drive amplifier, an output amplifier, a distortion cancellation circuit, a negative feedback loop and a primary amplifier. The output amplifier having an impedance load is driven by the drive amplifier and performs the push-pull amplifier operation. The distortion cancellation circuit drives the impedance load with a voltage gain of "1", whereby the distortion cancellation circuit cancels the distortion included in the output voltage of the output amplifier based on the voltage difference between the input and output voltages of the output amplifier. Hence, the apparent gain of the output amplifier is infinite. The negative feedback loop feeds the output voltage back to the primary amplifier as a negative feedback voltage. The primary amplifier drives the drive amplifier based on the voltage difference between the arbitrary input voltage and the negative feedback voltage.
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