Can you give a brief introduction about the structure of the NMOS ?
Mixed Signal Design Interview Questions
189 mixed signal design interview questions shared by candidates
Indepth physics and electronics concepts of MOSFETs, the models to explain behaviour, VI characteristics was asked. Basics about designing logics using gates and high level muxes also asked
Strong arm latch. Describe output waveform from the initial phase to the final state
R-RC-R circuit. What is the step response?
All the questions are related to My Resume.
noise in swtich capacity circuit
What is MDAC gain in 2.5bit-per-stage in pipelined ADC? I understood the answer after the interview... In the continuous-time sigma-delta modulator, can the gain-boosting amplifier be designed with a lower bandwidth? This is really hard to understand for new college grads if you don't have experience in designing that... Why is the intrinsic gain of BJT is higher than that of MOSFET? You need to review that the p-substrate in NMOS is lightly doped and and therefore more sensitive to reverse bias, and this is also where channel length modulation comes into the picture. Some of the circuit problems are really novel and I have to come up with new techniques to analyze it.
Basic analog/mixed-signal circuit design concepts
Mostly very basic Device Physics questions. Not very complicated and some of the questions were: 1. Describe the operation of NMOS and PMOS, 2. What is body effect? How does it affect the gate voltage. 3. Describe the operating regions of NMOS transistor 4. If gate voltage is 2V and drain voltage is is 2V what is the source voltage? 5. What factors affect threshold voltage? Explain them 6. What is channel length modulation?
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