Power Amplifier

324

04:23:00

(Electronics I — Lab 11)

Unlike many other simple amplifiers (e.g. Cascode Amp), this amplifier has no DC offset — notice how, with or without the AC source, the input voltage (BLUE) and output voltage (GREEN) both average 0 V.

Also unlike other simple amplifiers, the output voltage is not greater than the input.  The current is the value that ends up amplified, resulting is greater power at the output than the input.  (Recall:  Power = Volts * Amps)

published 11 years ago

thebugger

11 years ago

This is a typical class B amp veeery slightly set in class AB mode. Indeed they only have current amplification. And one more thing. It's still DC biased but since you're using dual rail power supply the center point is 0V. Keep it up!

thebugger

11 years ago

Ah and the way you calculate output power is P=Umax^2/R

hurz

11 years ago

Because of tolerances in real life you need for higher power amps a dc bias correction. This could be done automatically by integrating the output voltage and pump some little current back into the input. Anyway, keep it up please!

hurz

11 years ago

And never expect the generator at input is DC free. at least there you need a DC decoupling cap.

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