Question

what can you tell bout the resistor of emitter​

Answer 1

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The aim of an AC signal amplifier circuit is to stabilise the DC biased input voltage to the amplifier and thus only amplify the required AC signal. This stabilisation is achieved by the use of an Emitter Resistance which provides the required amount of automatic biasing needed for a common emitter amplifier.

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Answer 2

Answer:

The emitter resistor serves mutiple purposes. It improves the linearity of the amplifier, raises the input impedance, and simplifies biasing. Let us look at each characteristic individually. In the following I will refer to variation of the circuit with R E omitted as the 'grounded common-emitter amplifier'.

Explanation: