multisim

[hmee]

Hi;

I need to design a bandpass filter that works at high frequency, this band pass filter needs to be designed using operational amplifiers. So I chose a high speed, low noise opamp (e.g. LT1214). My initial design is done using Filter Solutions software ( I have access to the professional version ). But when I transfer the design into multisim the response is way too off.

My questions are: Is Filter Solutions a reliable source for the initial design?

                           Is there any trick to Multisim when working with relatively high frequencies? 

                           How can I test and simulate my design to make sure that when I design the PCB and  send it for assembly (I am going to have the PCB and the assembly 

                           done in factory) it will work properly?

                            And finally, should I use any other software for simulation/test?

                            Million thanks in advance.     

[Mahmoud_W · Accepted solution]

Hi,

I can help you on that but I need to know the following:

- At what frequency are you designing your filter?

- What kind of distributed elements are in the design and how many? (Can you send the multisim file and a screen shot of Filtersolutions schematic and response?)

- How are you transferring the design between both tools? Or you're simply recreating it?

The reason I am asking these questions is because some of the limitation Multisim has are the absence of S-parameter simulation and transmission line modeling. Knowing the frequency range and the complexity of the circuit, I can determine whether it can be worked around for RF filter design or not.

Mahmoud W

National Instruments

[hmee]

With Regards;

I can't appreciate enough for your response. Unfortunately I have been sick since two days ago and the campus is closed now for Holidays. I will send all the information next monday.

Again, thank you very much

Hovik Mirzakhanian