Discussion
Arrange these frequencies in increasing order for a typical common-emitter stage.
1. The input coupling break
2. The emitter bypass break
3. The Miller input break
4. The device's transition frequency
Select the correct sequence.
Answer: D
The order is 1, 2, 3, 4: a few hertz, a few hundred hertz, a few hundred kilohertz, and a few hundred megahertz. The gap between the third and the fourth is the Miller penalty, and it is usually two or three orders of magnitude - which is what makes the cascode worth its extra device. Laying the four out in order shows immediately where a design's effort should be spent.
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