Darlington Transistor Pair Output Resistance: Consider Source R?

Click For Summary
SUMMARY

The discussion centers on the output resistance of Darlington transistor pairs and the impact of the source's internal resistance. It is established that the internal resistance of the source, exemplified as 10kOhms, should indeed be considered when calculating the output resistance. The coupling capacitors are assumed to behave as a short circuit at signal frequency, which further influences the overall resistance calculation. The internal resistance is effectively in parallel with resistors R1 and R2 in the circuit.

PREREQUISITES
  • Understanding of Darlington transistor configurations
  • Knowledge of output resistance calculations in transistor circuits
  • Familiarity with coupling capacitors and their behavior at signal frequency
  • Basic principles of parallel resistance combinations
NEXT STEPS
  • Research the output resistance formulas for Darlington transistor pairs
  • Learn about the effects of internal resistance in electronic circuits
  • Study the role of coupling capacitors in AC signal processing
  • Explore advanced transistor circuit analysis techniques
USEFUL FOR

Electronics engineers, circuit designers, and students studying transistor applications will benefit from this discussion, particularly those focused on output resistance calculations in Darlington configurations.

Lunat1c
Messages
64
Reaction score
0
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
 

Attachments

  • darlington-circuit.gif
    darlington-circuit.gif
    2.3 KB · Views: 467
Last edited:
Physics news on Phys.org
Yes, the internal resistance of the source is in parallel with R1 and R2.
 

Similar threads

Engineering Diff gain of a push pull degenerated differential pair
  • · Replies 6 ·
Replies
6
Views
3K
Create a two-stage amplifier without feedback
  • · Replies 13 ·
Replies
13
Views
3K
Class A Amplifier Sinusoidal Input/Output Relation
  • · Replies 3 ·
Replies
3
Views
4K
Low and High Frequency Signal Equivalent
  • · Replies 2 ·
Replies
2
Views
2K
Oscillator problem, explanation needed
  • · Replies 6 ·
Replies
6
Views
3K
Low-pass filter with no inductance, and voltage output over a resistor
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad How to understand experiment to measure heat capacity of solid?
  • · Replies 1 ·
Replies
1
Views
2K
Unraveling the Mystery of EMF Internal Resistance
  • · Replies 2 ·
Replies
2
Views
2K
Capacitor auto-charge-discharge circuit
  • · Replies 1 ·
Replies
1
Views
5K
Differential pair, current mirror: high frequency analysis
  • · Replies 1 ·
Replies
1
Views
3K