Laplace transform analysis is used to designate the number of poles in a given filter. The total line current leads the applied voltage at frequencies greater than resonance and lags the applied voltage below resonance. At frequencies above resonance, the line current of a band-stop circuit increases while the impedance decreases. At the resonant frequency, the circuit exhibits a phase angle of zero. This results in zero total current at the resonant frequency since equaling produces equal inductive and capacitive current branches. It features a sharp increase in net impedance at the resonant or center frequency. An LC band-stop circuit distinguishes itself from a series LC circuit by its parallel arrangement. Hence, the term “tuned circuit” is interchangeable with the term “resonant circuit”. Tuned circuits are heavily used in receivers as they amplify certain frequencies at resonance. The passive band-stop circuit consists of a parallel LC network and requires a load in order to utilize its effectiveness in practice. Experiment 3: The Passive Band-Stop Circuit with Load Purpose and Discussion The purpose of this simulation is to demonstrate the characteristics and operation of a passive band-stop circuit.
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