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Grade: 11
        The plate resistance of a triode is 8 kΩ and the transconductance  is 2.5 millimho. (a) If the plate voltage is increased by 48 V, and the grid voltage is kept constant, what will be the increase in the plate current? (b) With plate voltage kept constant at this increased value, how much should the grid voltage be decreased in order to bring the plate current back to its initial value?
5 years ago

Answers : (1)

Navjyot Kalra
askIITians Faculty
654 Points
							Sol. r base p = (δV base p/ δl base p) at constant V base g
Consider the two points on V base g = -6 line
r base p = (240 - 160)V/(13 - 3) * 10^-3 A = 80/10 *10^3 Ω = 8KΩ
g base m = (δl base p/ δV base g)v base p = constant
considering the point on 200 V line,
g base m = (13 - 3) * 10^-3/[(-4) + (-8)] A = 10 * 10^-3/4 = 2.5 milli mho
μ = r base p * gm
= 8 * 10^3 Ω * 2.5 * 10^-3 Ω^-1 = 8 * 1.5 = 20

						
5 years ago
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