| 摘要 |
PROBLEM TO BE SOLVED: To improve low-frequency characteristics by omitting coupling capacitance, to prevent pop noise from being generated, and to eliminate the adverse effect of variation in automobile battery voltage. SOLUTION: A source voltage supplied to a front-stage part and a driver circuit of a power amplifying integrated circuit is made to be a common source voltage supplied from a stabilized power source. Consequently, the DC bias voltage VA on the output side of the front-stage part and the DC bias voltage VB on the input side of the power amplifying integrated circuit have nearly the same potential. Consequently, the front-stage part and power amplifying integrated circuit can be connected directly to each other, low-frequency characteristics can be improved, and pop noise is prevented from being generated. The driver circuit of the power amplifying integrated circuit is supplied with the source voltage from the stabilized power source, so the adverse effect of variation in automobile battery voltage on the power amplifying integrated circuit can be eliminated.
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