Lt spice: Is there a Freq transfer function (table: frequency, transfer, phase)

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Ronald Buining - 21 Feb 2008 08:33 GMT

I use Lt spice.

I want to design an inputfilter for a circuit of which I have:
- the transfer function (table: frequency, transfer, phase)
- the input impedance as function of frequency (table: frequency, transfer,
phase)

What function can I use in LtSpice to import these tables into the
simulation. I cannot find a function for it.
If it is not possible with LtSpice is there a alternative for LtSpice which
can do this. If needed I can spend up to a few hundred dollars.

I can understand that it is only possible to simulate ac transfer. That is
ok. I am interested mainly in simulating the ac transfer function of this
circuit including the inputfilter.

Thanks,
Ronald

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Helmut Sennewald - 21 Feb 2008 19:50 GMT

>I use Lt spice.
>
[quoted text clipped - 14 lines]
> Thanks,
> Ronald

Hello Ronald,

You can either use the classic E- and G-sources with Freq-tables
and PSPICE syntax or you an use the B-sources from LTspice.

Bv-source:

V=V(1,0) MAG FREQ=(1e6, 0.893, -26.7) (2e6, 0.705, -45.2) (5e6,
0.37, -68.3) (10e6, 0.195, -78.7)

Bi-source
I=V(1,0) MAG FREQ=(1e6, 0.893, -26.7) (2e6, 0.705, -45.2) (5e6,
0.37, -68.3) (10e6, 0.195, -78.7)

If you send me your email address, I will send you an example with E and B
sources.
You can download this example also from the LTspice Yahoo group.

http://tech.groups.yahoo.com/group/LTspice/

Files > Tut > freq_table_E_B_1.asc

http://tech.groups.yahoo.com/group/LTspice/files/%20Tut/

Best regards,
Helmut

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Electronics Forum / CAD / February 2008

Lt spice: Is there a Freq transfer function (table: frequency, transfer, phase)