Digital components are treated as large resistances to ground.Ĭonsider the circuit shown in Figure 1. Stop the simulation and change the frequency of the AC_VOLTAGE source, Vin.Open the Oscilloscope front panel and run the simulation.Open circuit file butterworth_filter.ms11 located in the Downloads section.You will use AC Analysis to determine its frequency response.Ĭomplete the following steps to configure and run an AC Analysis: This is a fourth-order Butterworth low-pass filter with a cutoff frequency of 500 Hz and a passband gain of 10 (20 dB) this circuit was taken from. Experiment with different values to see the circuit’s behavior. The circuit will attenuate frequencies greater that 500 Hz. If you want to perform the analysis with specific values for magnitude and phase, double-click the input source, Vin, go to the Value tab and enter values for AC Analysis Magnitude and AC Analysis Phase. In this exercise you will use the default values, 1V and 0°, respectively.
The additional settings in the Value tab are used for other analyses or for simulating with the instruments. Table 1 describes the Frequency Parameters tab in detail. Starting frequency of the frequency sweep.
It must be greater than zero.Įnding frequency of the frequency sweep. It must be greater or equal to the starting frequency. Indicates how the analysis frequency is swept. Its interpretation depends on the Sweep Type. For Decade/Octave, is the number of points per decade/octave.
Note: In SPICE, the command that performs an AC Analysis has the following form: For Linear, is the total number of points spaced evenly from the start to the stop frequency.Ĭontrols the y-axis scaling on the output graph. Where .AC initializes an AC Analysis is the sweep type is the number of points in the sweep and are the start and stop frequencies respectively. Note that these are the same parameters that were defined in Table 1, however, in Multisim you do not have to worry about the complex SPICE syntax.
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