McqMate
| Q. |
For what type of signals does a transistor behaves as linear device? |
| A. | small signals only |
| B. | large signals only |
| C. | both large and small signal |
| D. | no signal |
| Answer» A. small signals only | |
| Explanation: the small variation in the total voltage and current due to an application of signal moves the point up and down just by a bit and that whole up and down dynamics of the operating point from its dc value point can be approximated to be along a straight line. whole analysis can be done with same assumption of linearity with the limit of signal being in the same vicinity of the dc operating point. | |
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