RLC Circuits - Laboratory #9 - Circuit Analysis II | TEET 3145, Lab Reports of Electrical Circuit Analysis

Download RLC Circuits - Laboratory #9 - Circuit Analysis II | TEET 3145 and more Lab Reports Electrical Circuit Analysis in PDF only on Docsity! TEET 3145 Circuit Analysis II Laboratory # 9 RLC Circuits Fall 2009 Georgia Southern University   Mechanical and Electrical Engineering Technology Page 1 of 2 Name: _______________________________ PreLab work Resonance in RLC Circuits Read in the textbook or websites about resonance in RLC circuits. Find and understand the equation that is used to calculate the resonant frequency of an RLC circuit. Find out about the meaning of the frequency response and what is the bandwidth (BW) in an RLC circuit. 1.- Determining the Resonant Frequency of an RLC Parallel Circuit A resonant circuit, also called a tuned circuit consists of a resistor, an inductor and a capacitor together with a voltage or current source. An RLC circuit is in resonance when the voltage and current at the circuit input terminals are in phase and the input impedance of the circuit is purely resistive. Figure 1: Parallel Resonance Circuit Consider the Parallel RLC circuit of figure 1. The steady-state admittance offered by the circuit is: Resonance occurs when the voltage and current at the input terminals are in phase. This corresponds to a purely real admittance, so that the necessary condition is given by The resonant condition may be achieved by adjusting L, C, or ω. Keeping L and C constant, prove that the resonant frequency ωo is given by: -----1 2.- Plotting the Frequency Response of RCL circuits. Frequency Response is a plot of the magnitude of Output Voltage of a resonance circuit as function of frequency. The response starts at zero, reaches a maximum value in the vicinity of the resonant frequency, and then drops again to zero as ω becomes infinite. Figure 2 shows a typical frequency response.