E6C04: Which of the following is an advantage of BiCMOS logic?

Which of the following is an advantage of BiCMOS logic?

AIts simplicity results in much less expensive devices than standard CMOS
BIt is immune to electrostatic damage
CIt has the high input impedance of CMOS and the low output impedance of bipolar transistors
DAll these choices are correct

Why BiCMOS puts CMOS and bipolar transistors on the same die so each does what it does best. The CMOS input stage gives very high input impedance, so it barely loads the driving circuit, while bipolar output transistors provide low output impedance and high current drive for fast switching of capacitive loads. You get CMOS's low static power at the input together with bipolar's drive strength at the output.

Watch out The cost claim is backwards: fabricating both device types on one chip takes extra mask steps, so BiCMOS is more complex and more expensive than plain CMOS. And the CMOS gate inputs still have thin oxide, so BiCMOS is just as vulnerable to static discharge.

BiCMOS = best of Bi and CMOS: CMOS in (high Z), bipolar out (low Z, big drive).

HamSandwich explanation, first draft. The question and answers are the NCVEC text.

E6C04

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