ECE :: Analog Electronics
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A voltage tripler circuit and voltage quadrupler circuit use identical components. Then
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A Ge diode operated at a junction temperature of 27°C. For a forward current of 10 mA, VD is found to be 0.3 V. If VD = 0.4 V then forward current will be
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In a power amplifier the collector current flows for 270° of the input cycle. The operations is
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An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances are
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In figure the current through resistor R
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In a negative feedback amplifier A = 100, β = 0.04 and Vs = 50 mV, then feedback will be
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For an npn transistor connected as shown in the figure VBE = 0.7 volts. Given that reverse saturation current of the junction at room temperature 300K is 10-13A, the emitter current.
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A voltage doubler circuit is fed by a voltage Vm sin ωt. The output voltage will be nearly 2 Vm only if
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The purpose of connecting a coupling capacitor in the output circuit of an amplifier is
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iD2 = (47.73) x 10 mA = 466 mA.
= 8 kΩ.
.
approximated.
