Discussion
Why does the choice of operating current involve a noise trade-off?
Answer: A
Raising the current increases the shot noise but lowers the equivalent input noise resistance, so the optimum depends on the source impedance the stage works from. Neither extreme is universally better. Noise is certainly current-dependent. A parameter with an optimum rather than a direction is one where the source impedance has to be known before the design can be settled, which is why low-noise design begins with the source. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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