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Multistage amplifier : ウィキペディア英語版
Multistage amplifier

The performance obtainable from a single stage amplifier is often insufficient for many applications, hence several stages may be combined forming a multistage amplifier. These stages are connected in cascade, i.e. output of the first stage is connected to form input of second stage, whose output becomes input of third stage, and so on.

==Overall gain==
The overall gain of a multistage amplifier is the product of the gains of the individual stages (ignoring potential loading effects):
:Gain (A) = A1
* A2
*A3
*A4
*...
*An.
Alternately, if the gain of each amplifier stage is expressed in decibels (dB), the total gain is the ''sum'' of the gains of the individual stages:
:Gain in dB (A) = A1 + A2 + A3 + A4 + ... An

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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