| 单词 | amplifier |
| 释义 | amplifier A device that increases the strength of an electrical signal by drawing energy from a separate source to that of the signal. The original device used in electronic amplifiers was the triode valve, in which the cathode—anode current is varied in accordance with the low-voltage signal applied to the valve's control grid. In the more recent transistor, the emitter—collector current is controlled in much the same way by the signal applied to the transistor's base region. In the most modern devices the complete amplifier circuit is manufactured as a single integrated circuit. The ratio of the output amplitude (of p.d. or current) of an amplifier (or stage of an amplifier) to the corresponding input amplitude is called the gain of the amplifier |
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