| 摘要 |
<p>PURPOSE:To reduce the invalid current of a power output stage, to reduce cross-over distortion and to efficiently drive a MOSFET power amplifier by providing offset stages before and behind a power output stage and providing amplifier stages amplifying input signals before and behind the offset stages. CONSTITUTION:The positive side offset (level shift) stage 6 for PMOSFET Q1 and the negative side offset (level shift) stage 7 for NMOSFET Q2 are provided for the gate voltage bias of PMOSFET Q1 and NMOSFET Q2 in the power output stage 5. A positive side differential amplifier stage 8 is provided in the prestage of the positive side offset stage 6 and a negative side differential amplifier stage 9 in the prestage of the negative side offset stage 7. Voltage inputted to an input terminal 1 is impressed on the inverted input means of the differential amplifying stages 8 and 9. In such a case, the non- inverted input-sides of the differential amplifying stages 8 and 9 are connected to an output terminal 2, and they function as a voltage follower.</p> |
