Question

If a 1500 V load is ac coupled to the output in Figure 9–60, what is the resulting output voltage (rms) when a 50 mV rms input is applied? gm = 5000 mS.

Answer 1

The resulting output voltage (rms) when a 50 mV rms input applied is  -187.5 mV.

What is rms voltage?

Root Mean Square Voltage is the amount of AC power which produces the same heating effect as DC Power would have produced.

Vo = -gm x Vi (Rd II Rl )

Vo = -5000 x  10⁻⁶ x 50 x 10⁻³ x (1.5k II 1.5k )

Vo = -25 x 10⁻² x 750 x  10⁻³

Vo = -187.5 mV

Hence, resulting output voltage (rms) when a 50 mV rms input applied is   -187.5 mV.

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