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Altera_Forum
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12 years ago

Costas Loop - DSP Builder and ModelPrim blocks - Feedback problem

Hello Everyone, This is my first DSP Builder project and my first FPGA project. I have designed to the best of my knowledge a working costas loop in Simulink with ModelPrim blocks. The simulati...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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I assume you have used loop filter in which case I am surprised that you don't have delay through the filter(due to latency). Anyway you can add registers in the feedback loop to add further delay to that of loop filter.

You can't have costas loop without the feedback loop.

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I tried with various delays wihtout success..... until I tried a much longer delay (64). It now works.

Thanks for the reply,

Carl