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Answer the multiple choice questions below by choosing the one, best answer. 1) What are the two desired characteristics of a semiconductor device used as a power electronics switch? OOOOO a) high on resistance and high breakdown voltage b) high on resistance and low breakdown voltage c) low on resistance and high breakdown voltage d) low on resistance and low breakdown voltage e) low off resistance and high breakdown voltage 2) Why does power MOSFET technology use a cellular structure? OO a) To get as much MOSFET length in as little area as possible b) To get as much MOSFET width in as little area as possible c) To get as little MOSFET length in as much area as possible d) To get as little MOSFET width in as much area as possible e) To increase the output resistance of the device 3) Why do power MOSFET designs rely on vertical current flow? OOOOO a) To increase the breakdown voltage b) To decrease the breakdown voltage c) To increase the on-resistance d) To decrease the on-resistance e) To increase the breakdown voltage and the on-resistance
Lecture 5.2 Quiz (continued): 4) The on resistance in a DMOSFET consists of several components, Rox = R + Rch + Ryfer + Rør + Ryuk · Which one dominates in a very high voltage device? JFET DR SUB a) RS Ob) RCH Oc) RFET O d) RDR RŞUB 5) What is the fundamental trade-off that a power MOSFET device designer must deal with? OOOOO a) A high breakdown voltage leads to a low on-resistance b) A high breakdown voltage leads to a high on-resistance c) A high breakdown voltage leads to device latch-up d) A high breakdown voltage requires more expensive lithography e) A high breakdown voltage increases the MOSFET threshold voltage