6415Views6Replies

Author Options:

What is the difference between a current amplifier and a voltage amplifier? Answered

6 Replies

user
steveastroukBest Answer (author)2013-02-03

Here are three of the possible configurations of the topologies.

Select as Best AnswerUndo Best Answer

user
lemonie (author)2013-02-03

The current-amplifier gives you more power for driving big speakers. The voltage-amplifier increases the signal / data strength.
Why did you ask the question?

L

Select as Best AnswerUndo Best Answer

user
linkan.patel (author)lemonie2013-08-20

is it right that voltage amplifire need high input impedance and low out put impedance?
and the current amplifire need low input impedance and high output impedance.

Select as Best AnswerUndo Best Answer

user

if yes then why? then i can clear my next doubt...........please reply?

Select as Best AnswerUndo Best Answer

user
steveastrouk (author)2013-02-03

In a current amplifier, the controlled quantity is current, and the output voltages wanders around to keep current at some value fixed by either the current at the input, or the voltage at the input (actually, a transconductance amplifier.)

In a voltage amplifier, the controller quantity is VOLTAGE, and the output CURRENT wanders around to maintain the output constant.

Select as Best AnswerUndo Best Answer

user
Kiteman (author)2013-02-03

They're opposites.

If you increase voltage, then current goes down. If you increase current, the voltage goes down.

Select as Best AnswerUndo Best Answer