Discussion
Driven from \( 1 \ \mathrm{k\Omega} \), that Miller capacitance breaks at about
Answer: B
The source resistance works into the multiplied capacitance:
\[ \begin{aligned} f &= \frac{1}{2\pi (1000)(604 \times 10^{-12})} \\ &\approx 264 \ \mathrm{kHz} \end{aligned} \]
so about 264 kHz - a severe limitation for a device whose transition frequency might be three hundred megahertz. The gap between what the device can do and what the stage does is almost entirely the Miller effect, which is why so much circuit design is aimed at it.
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