At the resonance frequency, fR the opposite and in magnitude equal reactances (XC and XL) extinguish each other; the impedance Z in the circuit is minimal and dominated by the Ohmic resistance of the circuit with a phase angle of 0° (Figure ). Therefore, the main voltage drop occurs across the resistor and Vout is high. Consequently, the combination of L, C, and R elements results in a band-pass filter, which attenuates low and high frequencies, while frequencies around the resonance frequency can pass. The resonance frequency in a LC circuit can be calculated according to Equation 2. f R =