Class A amplifier has an efficiency of about(a) 30% (b) 50 % (c) 45% (d) 20%

Ex 5 : For a non-ideal amplifier with a following parameters, determinea. input S/N ratio (dB)b. output S/N ratio (dB)c. noise factor and noise figureInput signal power = 2 x 10 -10 WInput noise power = 2 x 10 -18 WPower gain = 1000000Internal noise N d = 6 x 10 -12 W

Amplifiers require DC Bias Voltage to operate.Group of answer choicesTrueFalse

If the output of a transistor amplifier is 5V rms and the input is 100 mV rms, the voltage(a) 5 (b) 500 (c) 50 (d) 100

For an amplifier operating at 27 °C with.a bandwidth of 20KHz.determine a) thermal noise power in watts and dBm, b) Calculatenoise power in watts if the bandwidth is doubled, c) RMS noisevoltage for 50 ohm load resistance and 50 ohm internal resistance

If an averaging amplifier has 5 inputs, the ratio Rf/Ri must be:a.0.1b.5c.2d.0.2