Discussion
Consider the following statements about small-signal models.
1. Their parameters are the slopes of the characteristics at the operating point
2. The transconductance depends only on the collector current
3. The input resistance is independent of beta
Which of the statements given above is or are correct?
Answer: D
The first two are correct and the third is the reverse of the truth: the input resistance is beta times the emitter resistance and inherits beta's full spread. That one parameter depends on beta and another does not is the most useful distinction in the model, because it predicts which of a stage's specifications will hold when the device is changed and which will not.
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