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Altera_Forum
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11 years ago

Costas Loop oscillates in ModelSim while locks in MATLAB!

Hello again, I have designed a Costas Loop in MATLAB and it simulates very well... locking and recovering the carrier. Here are the results: http://www.alteraforum.com/forum/attachment.php?...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

1) Did you keep loop at Rs*2 because this is the rate of the input signal to loop filter (sample rate)?

2) Updating with error is done by summing the error to the initial value or just feeding error to NCO?