| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent an adverse effect upon a power line due to spike noises N1, N2 which occur at a change between a power-on state and a shutdown state.SOLUTION: An amplifier device 100 includes: a main amplifier 10 for amplifying an input signal applied to an input terminal, to output to an output terminal; and a sub amplifier 20 for amplifying an input signal applied to an input terminal to output to the output terminal. The sub amplifier 20 has a gain and a current output capability set to be smaller than those of the main amplifier 10. The sub amplifier 20 shifts from the shutdown state to the power-on state, before the main amplifier 10 shifts from the shutdown state to the power-on state, and also shifts from the power-on state to the shutdown state, after the main amplifier 10 shifts from the power-on state to the shutdown state.</p> |
