Darlington Transistor Pair Output Resistance: Consider Source R?

In summary, a Darlington Transistor Pair is a circuit configuration consisting of two transistors used to amplify a weak signal. The two transistors are connected in a way that results in a higher current gain. Considering source resistance is important for accurately calculating the output resistance of the circuit. As the source resistance increases, the output resistance also increases. Darlington Transistor Pairs are commonly used in audio amplifiers, power supply circuits, motor control circuits, and electronic switches and relays.
  • #1
Lunat1c
66
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I have a small problem regarding darlington transistor pairs.

Lets say a source is connected to the coupling capacitor Ci and this source has an internal resistance of for example 10kOhms. When finding the Output resistance of the darlington, should the internal resistance of the source be taken in consideration?

Thank you

Note: The coupling capacitors are assumed equivalent to a short at signal frequency
 

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  • #2
Yes, the internal resistance of the source is in parallel with R1 and R2.
 

What is a Darlington Transistor Pair?

A Darlington Transistor Pair is a circuit configuration consisting of two bipolar transistors connected together to amplify a weak signal. It is commonly used to increase the current gain of a circuit.

How does a Darlington Transistor Pair work?

The two transistors in a Darlington Pair are connected in a way that the output of the first transistor becomes the input of the second transistor. This results in a higher current gain, as the output current of the first transistor is amplified by the second transistor.

What is the purpose of considering source resistance in a Darlington Transistor Pair?

The source resistance in a Darlington Transistor Pair affects the overall output resistance of the circuit. By taking into account the source resistance, the output resistance can be accurately calculated, which is important for circuit design and analysis.

How is the output resistance of a Darlington Transistor Pair affected by source resistance?

The output resistance of a Darlington Transistor Pair increases as the source resistance increases. This is because the source resistance limits the amount of current that can be amplified by the transistors, resulting in a lower output current and higher output resistance.

What are some common applications of Darlington Transistor Pair?

Darlington Transistor Pairs are commonly used in audio amplifiers, power supply circuits, and motor control circuits. They are also used in electronic switches and relays to amplify the control signal.

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