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Qualcomm Analog Design Engineer/Power Management Interview Question

I interviewed in Chandler, AZ and was asked:
"why is matching required?"
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Part of a Analog Design Engineer/Power Management Interview Review - one of 973 Qualcomm Interview Reviews

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Matching in MOSFET transistor inverters is necessary because the electrons that move in the NMOS transistor move at a faster rate than the holes that move in the PMOS transistor. This means when a signal is received, the NMOS will react before the PMOS. To equalize this, they transistors must be matched (by adjusting their widths) so that their transition times are the same.
- Sid Muthal on Oct 1, 2013 Flag Response

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