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This is the equivalent circuit to a transistor,
I am to find:
i )Short-circuit input impedance, H11
ii )Open-circuit reverse voltage gain, H12
iii)Forward current gain, H21
iv)Open-circuit output admittance, H22
Homework Equations
Vin = (H11)(Iin) + (H12)(Vout)
Iout = (H21)(Iin) + (H22)(Vout)
The Attempt at a Solution
So first i short the output, and the Vout = 0, then i have
Vin = (H11)(Iin)
Iout = (H21)(Iin)
H11 = R1 + R2//R3 = 110 Ω
H21 = -IR3 / Iin = 2/3
Then I open Iin source,
Vin = (H12)(Vout)
Iout = (H22)(Vout)
H12 = Vin / Vout
= (VR2 / Vout)
= 2/3
1/H22 = R3 + R2
H22 = 1/90 Ω -1
Am i doing this question correctly?
Reason of editing: Vin = V1; Vout = V2
Iin = I1 ; Iout = I2