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Grade: upto college level
         A triode has mutual conductance = 2.0 millimho and plate resistance = 20 kΩ. It is desired to amplify a signal by a factor of 30. What load resistance should be added in the circuit?
5 years ago

Answers : (1)

Aditi Chauhan
askIITians Faculty
396 Points
							Sol. r base p = 20 KΩ = Plate Resistance
Mutual conductance = g base m = 2.0 milli mho = 2 * 10^–3 mho
Amplification factor μ = 30
Load Resistance = RL = ?
We know
A = μ/1 + r base p/R base L where A = voltage amplification factor
⇒ A = r base p * g base m/1 + r base p/R base L where μ = r base p * g base m
⇒ 30 = 20 *10^3 *2 * 10^-3/1 + 20000/R base L ⇒ 3 = 4R base L/R base L + 20000
⇒ 3R base L + 60000 = 4 R base L
⇒ R base L = 60000 Ω = 60 KΩ

						
5 years ago
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