| 摘要 |
Provided is a circuit for cancelling VMOS transistor audio power amplifier distortion and temperature drift, the circuit comprising complementary S-stage outputted VMOS transistor power amplifiers (Q3, Q4); a series circuit with a resistor (R3) and a forward conduction diode (D1) is added between two G-stages; the series circuit is powered by a constant current source (Q2); the voltage drop at the two terminals of the series circuit provides the two complementary VMOS transistors with a static biased voltage between the G-stage and the S-stage; and simultaneously, the constant current source (Q2) is also the loader of an intermediate amplifier stage. The circuit noticeably reduces the open loop distortion of a VMOS transistor audio power amplifier. |
