Which among the following is also used as a buffer or an isolation amplifier?
Q. Which among the following is also used as a buffer or an isolation amplifier?- Published on 26 Oct 15a. Inverting amplifier
b. Non-inverting amplifier
c. Unity Follower
d. Emitter Follower
ANSWER: Unity Follower
Unity Follower circuit provides buffering or can be also used as an isolation amplifier which has a provision to obtain a gain at unity despite the requisite of any phase reversal. Emitter follower circuit is also semantic to unity follower only with an exception of gain which is in very much proximity of being absolutely equal to 1 (unity level).
Unity Follower is supposed to be used as buffer since it becomes quite feasible to transfer the input voltage in the form of output voltage along with the prevention of load resistance from loading down to input source simultaneously. This becomes possible because the value of input resistance tends to infinity & output resistance equals to zero.
