The figure of merit of a logic family is given by the product of:

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Question

This question was previously asked in

ESE Electronics 2010 Paper 2: Official Paper

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Answer 1

Figure of merit = Propagation Delay × Power Dissipation

For the best IC operation, FOM should be as small as possible.

Units: ns × mW

= pJ (pico Joule)

Propagation delay (tpd):

tPHL = delay time in going form High to low logic

tPLH = Delay time in going from low to High logic

Power dissipation (PD):

PD(avg) = Icc × Vcc

VCC = power supply

ICC = avg collector current calculated as the average of the High and low current, i.e.