# Complex impedance - Multisim

Discussion in 'General Electronics Chat' started by xxxyyy, Jun 21, 2012.

1. ### xxxyyy Thread Starter Member

Oct 7, 2011
34
1
Is it possible to represent complex impedance in Multisim?

2. ### crutschow Expert

Mar 14, 2008
13,028
3,237
A complex impedance is a combination of resistors, and/or capacitors, and/or inductors which can be readily simulated in Multisim. If you have a complex impedance value, then you need to transform that to an equivalent network of discrete components for simulation.

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3. ### xxxyyy Thread Starter Member

Oct 7, 2011
34
1
Here is my complex impedance:
Z=(50-50*j)Ω . I'm not sure that I know how to transform it

Last edited: Jun 21, 2012
4. ### Papabravo Expert

Feb 24, 2006
10,148
1,791
The first 50 is the real part and consists of a 50 Ohm Resistor. The imaginary part is a capacitor with 50 ohms of reactance at SOME frequency. This is important. If your impedance is supposed to be constant with frequency over some range (narrow?, wide?) then using real components may or may not give you what you want.

You do know how to compute a capacitance value from a reactance don't you?

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5. ### xxxyyy Thread Starter Member

Oct 7, 2011
34
1
If I didn't make mistake somewhere, equivalent for complex impedance Z=(50-50*j)Ω in Multisim should be 50Ω resistor in series with 0.004F capacitor? ω=5 rad/s, f=0.7957 Hz.

6. ### #12 Expert

Nov 30, 2010
16,321
6,818
Looks good to me.

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