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Transistor: Working

Consider a di...

Question

Consider a differential amplifier shown in the figure below, the two transistors are perfectly matched.

$If the value of R_{E} is increased, then$

common mode gain will decrease

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differential mode gain will unaffected

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differential mode gain will decrease

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common mode gain will increase

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Solution

The correct option is B differential mode gain will unaffected
$For given circuit, A_{D M} = - g_{m} R_{c}$

$A_{C M} = - \frac{R_{C}}{2 R_{E}}$

$Hence only common mode gain depends on RE and decreases with increase in R_{E} .$

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