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| Idea for a tiny function generator |
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| MarkF:
--- Quote from: mdszy on June 25, 2019, 12:09:43 am --- --- Quote from: Mr. Scram on June 24, 2019, 11:44:47 pm ---75 MHz doesn't sound low to me. Many generators do only 10 or 20 MHz and even then the square waves aren't that impressive. If you manage to do even 30 MHz with good fidelity, you've got a winning product on your hands. --- End quote --- I see, thank you! Wasn't quite sure what expectations were for a hobby-grade sort of function generator. --- End quote --- 75 MHz is the maximum clock rate. The maximum output frequency is half that (37.5 MHz). But that is the nyquist frequency. I would not expect to realize that. |
| MarkF:
Also, see this related discussion of the AD9834 and the AD9102 https://www.eevblog.com/forum/projects/dds-project-76783/ |
| Conrad Hoffman:
I've always been happy with a 5 MHz function generator. Any time I need higher frequency, I don't need functions, just a squarish or sine wave. At higher frequencies I use a dedicated RF generator that covers maybe 450 kHz to 500 MHz or more. A doubler is easy to do, so that gets me to 1 GHz, though I've never needed it. My fastest scope is 350 MHz, so I couldn't see it anyway! The only specialty signal I use is a composite FM generator for tuner alignment. 100 MHz, but with various different modulations. What I don't have is an arbitrary generator, so that would be of interest in any digital design I considered. |
| mdszy:
This is awesome input, thank you all for the suggestions! |
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