Mixed Signal/Analog Designer applicants have rated the interview process at AMD with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 67.2% positive. This is according to Glassdoor user ratings.
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Two rounds of interviews both of which will contain technical questions.
Second round would be with the director/manager. Know your circuit theory and devices well, especially the ones related to signal analysis.