Apple Hardware Engineer interview questions

Was first contaced by HR to schedule a phone technical interview. All Technical questions were pretty straight forward based on the job description. Did a bit of brush up on a few things

I applied to a job posting on their website and was contacted about a week later by a recruiter. Then there was one phone interview, about 30 minutes, with some general questions about my current job and work experience - nothing too technical. The actual on-site interview was a lot more difficult, some basic digital logic design problems, and principles like setup/hold time, metastability, etc. I met with 6 different interviewers plus one more at lunch. Thought it went relatively well, except for a few more analog circuit related questions I had no clue about. Then heard back that there was no offer about 3 weeks later.