$15\mathrm{.}33$ a$.$ Using $20$ nF capacitors, design an active broadband first$-$order bandpass filter that has a lower cutoff frequency of $2000$ Hz $,$ an upper cutoff frequency of $8000$ Hz $,$ and a passband gain of $10$ dB $.$ Use prototype versions of the low$-$pass and high$-$pass filters in the design process $($see Problems $15\mathrm{.}20$ and $15\mathrm{.}21).$