Analog design engineer interview questions shared by candidates
Why do we need the "DOWN" pulse in Hogge detector? Can we get by not using it?
My answer was we don't need to use it. But we have to change our filter structure. Using UP and DOWN fit well to charge pump and passive RC filter topology. Since DOWN is always 50% duty cycle when there is data transition, it acts as a reference. However, if we took the UP pulse alone, feed it to an active filter with one pole ar zero and one zero at a non- zero frequency we preserve the loop dynamics.
Using feedback theory concepts, explain how source degeneration decreases non-linearity in common source amplifiers? Compare the amplifier's harmonic distortion with and without degeneration.
Lots of questions on device physics of MOSFET, BJTs, diodes. A lot of questions dealt with treating the opamp as ideal and putting it in feedback. Large signal behavior of current mirrors, common gate, common drain, effect of temperature on gain etc. of a circuit.
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