11/27/2023 0 Comments Darlington transistor hfe 600![]() In the given circuit, h fe = 50 and h ie = 1000Ω, find overall input and output resistance. V T = 25mV, V Bias > 4V.Ĭlarification: For a MOSFET cascode amplifier, the net transconductance in the above network shown is equal to the transconductance of MOSFET M1 that is equal to 30mΩ -1.ġ1. Find the transconductance of the network given below, provided that g m1 = 30mΩ -1. For this circuit, the overall transconductance isġ0. Given that g m1 = 30mΩ -1 and g m2 = 50mΩ -1, α 1 = 1.1, α 2 = 1.5 what is the transconductance of the entire network?Ĭlarification: The above circuit is a cascade pair. What can be the correct value of input resistance if h fe = 50 and emitter resistance = 10kΩ.Ĭlarification: A cascade amplifier is a cascade network of CE and CB amplifiers, or CS and CG amplifiers. In the self bias network, the biasing resistances are 220kΩ and 400 kΩ. Capacitors and resistors are added to the circuit to prevent it from happening.ħ. To prevent a decrease in the input resistance due to the biasing networkĬlarification: A bootstrap biasing network is a special biasing circuit used in the Darlington amplifier to prevent the decrease in input resistance due to the biasing network being used. To prevent a decrease in the input resistance due to the presence of multiple BJT amplifiersĭ. To prevent an increase in the input resistance due to the biasing networkĬ. To prevent a decrease in the gain of networkī. What is the need for bootstrap biasing?Ī. It also provides a large β as per requirements.Ħ. Darlington amplifier is an emitter follower.Ĭlarification: Darlington pair is an emitter follower circuit, in which a darling pair is used in place of a single Calculate the collector current for Q2 given base current for Q1 is 20 μA.ĥ. Calculate the net current gain and the voltage gain of the network.Ĥ. Consider the circuit shown below where h fe=50.Ĭalculate the input resistance of the network.Ĭlarification: The load for the first transistor in the figure is the input resistance of the second. CollectorEmitter Sustaining Voltage 30 mA VCEO(sus) 60 Vdc (Min) TIP140, TIP145 80 Vdc (Min) TIP141, TIP146 100 Vdc (Min) TIP142, TIP147. It is a voltage buffer, not a current buffer.Ģ. TIP147, (PNP) Designed for generalpurpose amplifier and low frequency switching applications. Which of these are incorrect about Darlington amplifier?Ĭlarification: A Darlington amplifier has a very high input resistance, low output resistance, unity voltage gain and a high current gain. Analog Circuits Multiple Choice Questions on “Cascade and Darlington Amplifier”.ġ.
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