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Old 20th May 2023, 4:17 pm   #1
Chris55000
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Default Tool to draw Ring Modulator Waveforms?

Does anyone know of a free tool that will display graphically the results of multiplying two different frequency inputs, such as those in the double balanced mixer or Ring Modulator?

I'm looking for something where I can specify two sinusoids as normal time functions and calculate their sum, difference or product and display the result as a graph I can export, for use in my T & M Theory and Repair book's chapters on Spectrum Analysers!

These waveforms are too difficult to draw easily by hand!

Chris Williams
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Old 20th May 2023, 5:21 pm   #2
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Default Re: Tool to draw Ring Modulator Waveforms?

Knock up a quick circuit in LT Spice. You can type in equations for a BV (behavioural voltage source) It will give you outputs as waveforms, spectra etc.

David
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Old 20th May 2023, 7:11 pm   #3
Trigon.
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Default Re: Tool to draw Ring Modulator Waveforms?

Here's an on-line graphic calculator:-

https://www.desmos.com/calculator

e.g. Screenshot
Click image for larger version

Name:	S003.jpg
Views:	44
Size:	53.0 KB
ID:	278509

You can adjust axes, grids etc. etc. and export a .png via 'Share' at the top right.
Click image for larger version

Name:	desmos-graph-1.jpg
Views:	31
Size:	54.4 KB
ID:	278510

Cheers
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Old 20th May 2023, 7:54 pm   #4
ian_rodger
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Default Re: Tool to draw Ring Modulator Waveforms?

I'd probably use a spreadsheet for this. Just tried it in Excel - works fine.
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Old 20th May 2023, 11:46 pm   #5
fetteler
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Default Re: Tool to draw Ring Modulator Waveforms?

Quote:
Originally Posted by ian_rodger View Post
I'd probably use a spreadsheet for this. Just tried it in Excel - works fine.
Yep, my thought too.

Steve.
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