Discussion
How is an emitter follower usually biased?
Answer: D
The standard arrangement is a base divider setting the base voltage and an emitter resistor to ground carrying the current, exactly as in a common-emitter stage but with the output taken from the emitter. Fixed bias would be as unstable here as anywhere. A grounded emitter is impossible in a follower, since the emitter is the output. Bias arrangements transfer between configurations, and only the terminal used for output changes. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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