Delta method for PWM in VHDL

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Hi!
I am new to this forum. I have a question if anyone could help me... 🙁
I want to implement the delta method (sigma-delta method is also good) for pulse width modulation in VHDL (for a Spartan 3 board). Could anyone help me on this matter, or at least give me some helpful links?
I can find diagrams of feedback systems, but no information of actual block diagrams suitable for VHDL.

Cheers,
Lorena 😀
 
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