Above are the schematics of 3 different BJT current sources. Which of the follow

Question

Above are the schematics of 3 different BJT current sources. Which of the following are CORRECT? There can be multiple answers:

1) The circuit shown in (a) is the Widlar current srouce.

2) The circuit shown in (c) is the basic 2-Transistor current source.

3) The circuit shown in (b) has a lower output resistance compared to the circuit shown in (c)

4) One can use circuit (c), if biasing current needed is too small. The cicuit can obtain low bias currents without using very large resistors.

5) In comparison to basic 2 transistor current source, output current of the circuit shown by (b) has more stability with respect to changes in transistor gain B

Explanation / Answer

1. The circuit in a is the Wilson current source

2. True

3. The output resistance of both the circuits are same

4. True, the bias current reduces due to the effect of beta

5. True

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