Simple BJT as Amplifier - Small Signal

121

02:06:51

Bias Point Analysis:
Is = 5x10^-17
β = 100
Vτ = 0.026

Ic = Is*exp(Vbe/Vτ) = 1.1531mA
Ib = Ic/β = 11.5313 μΑ
Ιe =  Ic + Ib = 1.1643 mA
Vc = Vcc - Ic*Rc = 1.4232 V

Small Signal Analysis:

gm = Ic/Vτ = (1/22.5479) 1/Ω
Rπ = β/gm = 2254.79 Ω
Gain = Vout/Vin = -gm*Rc = -22.1750
(suppose Ro->Inf, so without Early Effect)

Input Impedance:
Rin = Rπ = 2254.79 Ω
Ouput Impledance:
Rout = Rc = 500 Ω

Examples:
Vin = 5 mV ptp then 
Vout_max = Vc + gm*Rc*Vin = 1.5341V
Vout_min= Vc - gm*Rc*Vin = 1.3123 V

published 7 years ago

kiani

7 years ago

Nice work aimilios.

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