ABOUT DIGITAL CIRCUITS/VLSI DESIGN (© Fuding Ge)

Though you are applying for an analog circuits position, they often also ask you one or two digital/VLSI questions. To my experience, some basic logic gates such as NAND, NOR, XOR (XNOR) circuits are very important. Sometimes they ask you to use NAND NOR gates to realize the XOR function, some times they even ask you to use 8 transistor to realize this function. To my experience, you should read the whole textbook by Thomas A. DeMassa "Digital Integrated Circuits" including those parts that talk about Flip-Flop. They often ask you a small question about State Machine or State Diagram. If you do not has the basic concepts of these concepts, read some books or take a course.

When I interviewed with Intel, they asked me to use some logic gates to realize a traffic light control problem (which I was unable to do in the specific time).

If they want to test your layout concepts, they may ask you to draw the layout of
NAND/NOR gate. Read the book "Principles of CMOS VLSI Design, A System Perspective, Neil H.E. Weste, Kamran Eshraghian, AT&T, 1993" to get some "feeling".

At this point they may also ask you questions about ESD/Latchup, the above book is also good to refresh your memory.
[some more info of ESD protection]

Set-up and hold time are also very important concepts. You should know them for sure.

ABOUT DIGITAL CIRCUITS/VLSI DESIGN (© Fuding Ge)