Why would you want to only bypass pan of the emitter resistance of a common emit

Question

Why would you want to only bypass pan of the emitter resistance of a common emitter amplifier? What do you need to consider when choosing capacitance values (not the type of capacitor, just the value) for coupling amplifiers? Why is the input impedance of a C-E amplifier affected by the emitter resistance? Briefly describe how you can leverage the voltage gain of a multistage amplifier to determine the current gain. Why is the current gain of the common gate amplifier not infinite? The common collector amplifier has several unique characteristics - list two of them. The common collector amplifier has two primary uses based on its special characteristics, what are they?

Explanation / Answer

1. bypass resistance affect the circuit performance in two ways

a. it lowers the overall gain of circuit

b.it increases the Input resistance

that is why it is necessary to remove or bypass it to protect the gain of amplifier and there is a trade off between gain and input impedence

2. when capaciance is large i.e in order of micro farad then it will affect the circuit at low frequency.

3. emitter resistance offers negative feedback (series series ) so it will increase the input impedence by feedback factor.

4.to find current gain we need I0 and Iin .so fing the middle stages voltage gain and multiply them and we will get overall current gain. or

find overall voltage gain and power gain

as we know power gain = voltage gain x current gain

5.because no circuit is ideal there will be huge losses by the circuit components as we know current gain of common gate amplifier is in the range 10 -100

6. common collector is

a.voltage follower

b.high current gain so current amplifier

7.

a.voltage follower (voltage gain is approximate equal to 1 )

b.high current gain so current amplifier ( very high current gain)

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