Electronics Handbook/Devices/Amplifier/DC Volatge Amplifier

Transformer Amplifier

\frac{V_{s}}{V_{p}} = \frac{N_{s}}{N_{p}}

Transformer acts as Amplifier if N₂ > N₂

When Transistor conducts current

I_b ≠ 0 , I_e = α I_b , I_c = β I_b

\frac{V_{o}}{V_{i}} = 1 - \frac{R_{2}}{R_{2} + R_{1}} \frac{R_{3}}{R_{4}}

When R₁

\frac{V_{o}}{V_{i}} = 1 - \frac{R_{3}}{R_{4}}

\frac{V_{o}}{V_{i}} = - n

provided that R₃ = (n+1)R₄

\frac{V_{o}}{V_{i}} = \frac{R_{2}}{R_{2} + R_{1}} \frac{R_{3}}{R_{4}}

When R₁

\frac{V_{o}}{V_{i}} = \frac{R_{3}}{R_{4}}

\frac{V_{o}}{V_{i}} = n

provided that R₃ = nR₄

V_{o u t} = - V_{i n} (\frac{R_{f}}{R_{1}})

V_{o u t} = V_{i n} (1 + \frac{R_{2}}{R_{1}})