Discussion
Consider the following statements about temperature effects on a transistor.
1. Beta rises with temperature
2. The base-emitter voltage needed falls by about two millivolts per degree
3. Leakage current halves for every ten degrees of rise
Which of the statements given above is or are correct?
Answer: A
The first two are correct and the third has the direction reversed: leakage roughly doubles rather than halves every ten degrees. All three of the real effects push the collector current up, which is precisely why they cannot be relied on to cancel and why stabilisation must be built into the circuit. A statement with the right mechanism and the wrong sign is the most easily overlooked kind of error. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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