LPF gives 2 different simulations

  • Thread starter Thread starter deki
  • Start date Start date
  • Tags Tags
    Simulations
AI Thread Summary
A 3rd order bandpass filter (BPF) was designed and successfully tuned in AWR Design Environment, but yielded different results when simulated in LT Spice using the same component values. The user observed discrepancies in the input voltage during AC analysis in LT Spice, which they suspect is affecting the filter's response. There is a possibility that the two software programs handle source impedance differently, leading to the variations in simulation outcomes. The user seeks clarification on the AC analysis process in LT Spice to better understand the differences. Understanding these factors is crucial for achieving consistent simulation results across different software platforms.
deki
Messages
15
Reaction score
1
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.
 
Engineering news on Phys.org
I'm just guessing, but one program may include the source impedance in the AC source, and the other not.
 
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Thread 'EMF (Electromagnetic Field) & EHS (Electromagnetic Hyper Sensitivity)'

Hello dear reader, a brief introduction: Some 4 years ago someone started developing health related issues, apparently due to exposure to RF & ELF related frequencies and/or fields (Magnetic). This is currently becoming known as EHS. (Electromagnetic hypersensitivity is a claimed sensitivity to electromagnetic fields, to which adverse symptoms are attributed.) She experiences a deep burning sensation throughout her entire body, leaving her in pain and exhausted after a pulse has occurred...
View full post »

Similar threads

Active LPF or Integrator w/feedback Resistor
Replies
8
Views
1K
Transmission line transient simulation
Replies
4
Views
1K
ABC reference frame synchronous generator modelling in Ltspice
Replies
1
Views
3K
I Numerical calculations of a railgun yielded disappointing results
Replies
4
Views
895
JFET, Mosfet, BJT Design Question
Replies
13
Views
3K
How to Plot Frequency Response of a Power Supply Using SPICE?
Replies
1
Views
7K
Buck Converter Design for PMDC Motor
Replies
1
Views
3K
Building a Simple Amplifier Circuit With High Slew Rate and Bandwidth
Replies
9
Views
7K
Engineering Set time delay for a comparator Op-amp circuit
Replies
2
Views
12K
Sending drive Pulse in CQED and visualize the state by QuTip
Replies
6
Views
3K

Hot Threads

Recent Insights

Back
Top