LPF gives 2 different simulations

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SUMMARY

The discussion centers on the discrepancies observed between simulations of a 3rd order Bandpass Filter (BPF) designed in AWR Design Environment (Microwave Office) and LT Spice. The user successfully tuned the BPF in AWR but encountered a different response in LT Spice, attributed to potential differences in how each software handles input voltage and source impedance during AC analysis. The user expresses uncertainty regarding AC analysis in LT Spice, indicating a need for deeper understanding of the tool's simulation parameters.

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  • Familiarity with 3rd order Bandpass Filter (BPF) design
  • Understanding of AC analysis in circuit simulation tools
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  • Experience with LT Spice simulation software
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Electrical engineers, circuit designers, and anyone involved in filter design and simulation using AWR Design Environment and LT Spice.

deki
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I've designed a 3rd order BPF. I tuned it in AWR Design Environment (Microwave Office), and got the response I wanted:
1.jpg


However using the same component values with LT Spice gives me a different response:
2.jpg


The other thing I've noted in the plot is the input voltage. I'm not that familiar with AC analysis in LT Spice, but why does the input voltage look like that? That's what is contributing to my uneven response.
 
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I'm just guessing, but one program may include the source impedance in the AC source, and the other not.
 

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