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Micron Technology Product Engineer Interview Question (student candidate)

I interviewed in Boise, ID and was asked:
"Given: three clamped NMOS transistors in series with Vcc at the beginning. The output of the final one went into the source of a PFET, with the drain tied to ground and the gate tied to some voltage, I forget exactly what. I was asked to label the voltage at each node, and then which state the PFET was in."
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Answers & Comments

of 2
Each NMOS transistor dropped Vcc down by .7v due to VT drop for a total drop of 2.1v. I don't remember what the gate of the PFET was at, but the voltages were such that the state was unexpected.

Sorry for the cruddy recollection, but it was awhile ago.
- Interview Candidate on Feb 8, 2012 Flag Response
of 1
Just to add to the above remark, NMOS when ON does not pass a good High Voltage, the source side is always Vth below the gate voltage (ensuring ON state). Assuming Vth is 0.7V and the 3 NMOS are ON using VDD the net drop across the 3 transistors is VDD - (3 x 0.7) = VDD - 2.1

Depending on VDD and Gate voltage at PMOS you can come up with its state.
- NCG (ASU) on Jun 15, 2012 Flag Response
of 1
if all gates of NMOS are connected to Vdd then it'll only degrade once which is Vdd-Vtn for the first NMOS, for the rest of two NMOS it can pass the full Vdd-Vtn
- Han on Jun 28, 2012 Flag Response

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