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Altera_Forum
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12 years ago

Using VHDL to generate 20Mhz sine wave and visualizing with a 10bit DAC

Hi all. I want to generate a 20MHz sine wave in VHDL but have no clue of how to do it. Also, with a device like EP3C10E144C8N, is it possible to achieve that frequency? Also, I intend to use 10-bit o...
Altera_Forum's avatar
Altera_Forum
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12 years ago

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Both will need a filter, and with low sampling frequency of 100 MHz, the filter effort isn't so much lower than for a square wave.

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I think you are talking about post DAC filter. For a proper NCO you only need the usual anti-image filter. For rectangular pulses you need a shaping filter for the tone's fundamental itself.

However I am talking about QAM in digits. The normal procedure is to get a clean digital tone for modulation. The DAC output will then just need anti image filter.