Question

Power consumed in a CMOS circuit operating at frequency f is proportional to:
1.  V_cc
2. V_cc f
3. \(V_{cc}^2 f\)
4. \(V_{cc}^2 f^2\)

Answer 1

Correct Answer - Option 3 : \(V_{cc}^2 f\)

Static power is proportional to the static current, i.e. the current that flows regardless of gate switching.

Dynamic Power is related to the current that flows when switching takes place and is given by for CMOS as:

P = fCV2cc

Or P = Kf (where K = Vcc2C)

Power consumed by CMOS = Pstatic + Pdynamic