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Senior Design Engineer Interview Questions

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In saturation, the channel region pinches off well before the drain. How does current get from the source to drain then? (Since the channel is pinched off, it does not touch the drain)

3 Answers

Tunneling

Its drift, there is an electric field across the depletion region, whenever an electron diffuses into the depletion region, the electric field sweeps it across the the drain, the current thus depends on the diffusion into the depeletion region rather than the electric field strength so current is relatively constant in saturation.

This is an excellent question and the last answer by anonymous is very correct. I will try to elaborate further. Now, when the channel is pinched off, this is due to an extension of the depletion region between the drain and the bulk into the channel region, thus due to the large(+ve) E field from drain to source, Electrons are swept into the n+(drain) region, thus u have drift current due to this movement! Now technically speaking, whenever you have a depletion region btw the N+ and P material, the current flow contribution is not only due to Drift, you have Diffusion contribution also but is assumed negligible compared to Drift current!

A key is broken on your laptop keyboard. How do you work around it until you can get a new keyboard?

5 Answers

which is hard to fix -- setup violation or hold violation? And why?

3 Answers

Reverse a sentence but keep the individual words in the same order

2 Answers

Tell me about a time when you did not perform well in your job and what you did about it...

1 Answer

Why do you want to work for Marvel?

1 Answer

Op-amps analysis

1 Answer

Modify full precission adder to half precision.

1 Answer

Array of flops in a register file .. how to reduce power

1 Answer

Overall ok . Didn't any one question to be very difficult

1 Answer
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