Systems Hardware Engineer Interview Questions | Glassdoor

# Systems Hardware Engineer Interview Questions

6

Systems hardware engineer interview questions shared by candidates

## Top Interview Questions

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Apr 10, 2014

Apr 10, 2014
 How do you prevent quantization errors from stacking up when reducing a number's precision by a divide or bit-shift operation?1 AnswerI did not know the answer outright because I haven't done much with DSP's or recursive filtering. But I was able to arrive at the answer pretty quickly. The basic idea is that you might split a 32bit word into 2x 16bit fields to do a sort of quasi-floating point math using purely unsigned integer data types. The high 16 bits represent the integer part of the number, and the low 16 bits represents the fractional part. When you're done doing your math on this quasi-FP number and you need to convert it back into a normal integer, you can just divide by 2^16, or bit shift right by 16 bits, but that introduces a quantization error by throwing away the fractional part. If the output bit-shifted number is used in a recursive filter, then how do you prevent your filter from accumulating the effect of always rounding down? I suggested that you should design the filter to alternate rounding down and rounding up on every other sample, so at least the intrinsic system bias is removed. This turned out to be correct, but it took 5-10 minutes to get there, and I got the feeling that the interviewer would have preferred that I just knew the answer. It ended up being a problem solving kind of question for something I think I was just supposed to know. Again, if DSP algorithms were important to this job, then why didn't it say so in the job description? But I could be wrong on this - it's just a feeling I got.

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Sep 23, 2016
 Signal Integrity questionsBe the first to answer this question

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May 8, 2017
 When have you been in a group/team situation where things did not go as planned?Be the first to answer this question

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Aug 14, 2012
 Equivalent resistance of a resistor cube, with 1ohm resistor on each side. 1 Answer5/6 ohms

### Hardware Engineer Routing Systems at Juniper Networks was asked...

Apr 1, 2015
 The one question asked was that what is the thing on your resume which you are most proud of and which is most interesting.1 AnswerWe discussed one of the project I made
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