Plotting Rc on an Ic vs Vce Graph

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SUMMARY

The graph plotting collector current (Ic) against collector-emitter voltage (Vce) does not represent the load resistance (Rc); instead, it illustrates the relationship between Ic and Vce for varying base currents. The load resistance (Rc) is a constant value in the circuit and remains unchanged regardless of base current variations. This graph is essential for analyzing transistor characteristics and determining the operating region of the device.

PREREQUISITES
  • Understanding of transistor operation and characteristics
  • Familiarity with collector current (Ic) and collector-emitter voltage (Vce)
  • Knowledge of load lines in transistor circuits
  • Basic concepts of base current in bipolar junction transistors (BJTs)
NEXT STEPS
  • Research the concept of load lines in transistor circuits
  • Learn about the operating regions of bipolar junction transistors (BJTs)
  • Explore the impact of varying base currents on transistor performance
  • Study graphical analysis techniques for transistor characteristics
USEFUL FOR

Electronics students, electrical engineers, and anyone involved in transistor circuit design and analysis will benefit from this discussion.

Physicist3
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On a graph where Ic is plotted against Vce for a range of base currents, does the line represent the load resistance (Rc)?
 
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Physicist3 said:
On a graph where Ic is plotted against Vce for a range of base currents, does the line represent the load resistance (Rc)?

Which line?

http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/ietron/loadline3.gif

loadline3.gif
 
Yeah, definitely a helpful drawing. BTW, I found it very quickly by using a Google Images search on transistor load line. I like Google Images searches for many tasks, because they can get you to what you want much faster than sifting through a bunch of hyperlink hits from a regular Google search.
 


No, the line on the graph does not represent the load resistance (Rc). The line on the graph represents the relationship between collector current (Ic) and collector-emitter voltage (Vce) for a range of base currents. The load resistance (Rc) is a fixed value in the circuit and does not change with varying base currents. The graph is used to analyze the characteristics of a transistor and determine its operating region.
 

Thread 'uA709 op amp compensation'

Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?
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