DC Current Source
A current source, unlike DC voltage source, is not a physical reality. But, it is useful in deriving equivalent circuit models of the semiconductor devices like a transistor. It can also be subdivided into ideal and non-ideal categories.
The Ideal Current Source
By definition, an ideal current source, depicted in Figure (a), generates a current which is independent of the variations in load. Or we can say that the current supplied by an ideal current source does not change with the load voltage.
Non-Ideal or Practical Current Source
The current which is delivered by a practical current source falls off with the increase in load or load voltage. This behaviour can be modelled by connecting a resistance in the parallel with the ideal current source as shown in the Figure (b) here Rs is internal resistance
Ideal and non-ideal current sources.
Resistance of current source and RL represents the load. The equation of the practical current source can be given as
In the ideal current source, Rs =∞(open circuit), thus IL=Is.
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