ECE :: Analog Electronics
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An amplifier has open loop gain of 100, input impedance 1 kΩ and output impedance 100 Ω. If negative feedback with β = 0.99 is used, the new input and output impedances are
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In a BJT amplifier the power gain from base to collector is 4000. The power gain in dB is
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In figure, secondary winding has 40 turns. For maximum power transformer to 2 ohm resistance the number of turns in primary is
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In a CE amplifier circuit the dc voltage between emitter and ground
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A buffer amplifier should have
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If the differential voltage gain and the common mode voltage gain of a differential amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is
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An npn transistor has a Beta cutoff frequency fβ of 1 MHz, and a common emitter short circuit low frequency current gain β0 of 200. It unity gain frequency fT and the alpha cut off frequency fa2 respectively are
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In figure if the transistor is cut off, the collector voltage is equal to
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If input frequency is 50 Hz, the frequency of output wave in a full wave diode rectifier circuit is
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A class A transformer coupled power amplifier is to deliver 10 W output. The power rating of transistor should not be less than
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20 log (CMMR) = 20 log Ad - 20 log Ac = 48 - 2 
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