Electronics > Beginners
DIY Function Generator
AlxDroidDev:
What about the ISL5314 ?
I know it is an expensive IC, but would it fit in a project controlled by a STM32 ?
Vtile:
Then there is the OPA route and Discrete route. :-/O
These cheap arbitrary gens are interesting, I wonder do they suffer from extreme distortion in high frequenzies with full voltage swing as my function generator that is part of my USB oscilloscope (from known oldish brand).
Old 555 chip can handle the function gen duties for as first "function gen".
Smokey:
One thing to watch out for with cheap arbs is the PC software to create the waveforms. Cheap hardware often comes with cheap damn near unusable software.
Kleinstein:
Those cheap Chinese function generators often use an FPGA and cheap DAC to provide DDS and arb function. In principle this is very viable and the good ones do it the same way. The problem is more the low DAC quality - often just a few resistors to do R2R: this is limited speed and accuracy (e.g. 6-8 Bit). Also the filter is usually not what is should be for a good DDS.
The other point is the performance of the output stage - so slew rate limits appear at higher amplitude.
Brutte:
--- Quote from: MarkF on January 14, 2017, 08:36:01 pm ---I built a DDS with an AD9834, a PIC18F2550 and a small OLED display.
--- End quote ---
I wanted to tie STM32L to USB and make some GUI for uploading ROM table and tweaking frequency on-the-fly but due to lack of time I prepare that data offline and just flash a uC.
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