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Power Designer Interview Questions


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why is matching required?

1 Answer

Matching in MOSFET transistor inverters is necessary because the electrons that move in the NMOS transistor move at a faster rate than the holes that move in the PMOS transistor. This means when a signal is received, the NMOS will react before the PMOS. To equalize this, they transistors must be matched (by adjusting their widths) so that their transition times are the same.

Phone interview: Questions based on resume, followed by low power design questions: 1. How can you reduce power on chip? 2. Dynamic Power, Leakage power? 3. Types of circuits required to implement low power design-level shifters/isolations cells etc. 4.Questions on In rush current. Onsite interview: 1-1 interviews each 1 hour long from 9:30am -5:00pm Initially, questions on the resume. 1. Basic Computer Architecture questions. 2. IR Drop reduction on chip using Redhawk 3. Setup and hold time issues and solutions. 4. Primetime timing report interpretation 5. Steps in Design compiler, primetime, ICC, Redhawk 6. Low power design questions and how to implement low power design. 7. Ways to reduce dynamic and leakage power. 8. Basic scripting questions on TCL. 9. Mosfet operation and diagram of the different types of leakage currents. 10. Everything on the resume in detail and job description dependent questions.

One interviewer gave a puzzle to solve, which was actually kind of fun.

I was able to manage most of the questions except very few that related to manufacturing and need some industrial experience.

Do you expect the pressure drop across a heat exchanger to increase or decrease if the fluid is switched from water to oil?

None. Did not expect to solve riddles//puzzles in the end.

Asked me basic technical questions, personality based question, like how to resolve office conflicts, how to lead a team. Some physical design questions, CMOS gates. etc

Several basic RC, RLC, LR filter questions, like given a step response to input, what will the output looks like. They also asked me about my former internship works (boost converter waveform, compensation). Some control questions too.

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