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E7G09

When designing an op-amp RC active filter for a given frequency range and Q, why are the external capacitance values usually chosen first, then the external resistance values calculated?

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AThe equations for the calculations can only be used with known capacitance values
BThe calculations are easier to make with known capacitance values rather than with known resistance values
CAn op-amp will perform as an active filter using only standard external capacitance values
DCapacitors with unusual capacitance values are not widely available, so standard values are used to begin the calculations