The tank circuit, a common building block in electronic systems, is a parallel resonant circuit comprised of an inductor, a capacitor, and an optional resistor. Since the capacitor and the inductor both store energy, this type of circuit is referred to as a tank circuit. By taking advantage of its bandpass response characteristic, tank circuits are typically used to limit bandwidth. This is of particular interest in filtering an IF signal which is to be amplified by a very large gain. By limiting the bandwidth, one is able to limit the noise power of the unfiltered signal, which could easily saturate the amplifier.