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waveform generator in FPGA

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1nandha

1nandha

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How to develop a VHDL code for waveform generators?
Or can anyone please tell me how and what are the concepts of a waveform generator in detail.
 

It can depend on the waveform.
A sin wave would be generated using a look up table, a triangle wave simply using a counter, square wave is just a toggle.
 

for a simple square wave, it like a clock. You need just a counter in your vhdl code. But for sine wave i think you need A/D Hardware.
 

All of three seconds of random googling:



That approach uses a lookup table.

---------- Post added at 03:44 ---------- Previous post was at 03:43 ----------
BuBEE said:
for a simple square wave, it like a clock. You need just a counter in your vhdl code. But for sine wave i think you need A/D Hardware.
Click to expand...


You don't necessarily need a DAC. You can also PWM the signal on an fpga output pin and then lowpass filter, which can be as simple as an RC filter. I did that in the past and got something like 7 bits resolution, which was good enough for that project. If you need both high resolution and high sample rate then PWM won't cut it and you'll need a DAC.
 

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