Question
This effect contributes a coefficient of one minus the voltage gain in the Miller effect. For 10 points each:
[10m] Name this effect in which circuit elements inhibit the efficiency of a circuit by storing charge, thus creating a voltage barrier. It is a limiting factor for the operating frequency and bandwidth in many circuits.
ANSWER: parasitic capacitance [or stray capacitance; prompt on capacitance or self-capacitance]
[10h] Description acceptable. Miller capacitance equals capacitance times one minus the voltage gain when this assumption about the general value of a quantity holds. Violating this assumption results in voltage gain attenuation that warrants the use of Miller’s approximation.
ANSWER: low frequency [accept equivalents; accept answers that describe the frequency in the system being less than the cutoff frequency; accept answers that describe the frequency being too low for roll-off to occur; prompt on answers that describe no occurrence of roll-off; accept “nu” or “f” in place of “frequency”]
[10e] Parasitic capacitance often occurs between the bases and collectors of these devices exemplified by MOS·FETs and BJTs.
ANSWER: transistors [accept metal-oxide-semiconductor field-effect transistors or bipolar junction transistors]
<Shahar Schwartz, Physics>
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