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Question

A triode has mutual conductance = 2.0 millimho and plate resistance =20KΩ It is desired to amplify a signal by a factor of 30. What load resistance should be added in the circuit?

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Solution

Here rp=20KΩ
= Plate resistance
Mutual Conductance =gm
= 2.0 milli mho
=2×103mho
Amplification factor, μ=30
Load Resistance =RL=?
We Know A=μ1+rpRL
Where A = Voltage amplification factor.
A=rp×gm1+rpRL.Whereμ=rp×gm30=20×103×2×1031+20000RL3=4RRL+200003RL+60000=4RLRL=60000Ω=60KΩ


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