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ISRO Scientist EC 2014 Official Paper

Option 3 : 20 mW

ISRO Scientist ECE: 2020 Official Paper

349

80 Questions
240 Marks
90 Mins

**Concept:**** **

**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 = fCV^{2}_{cc}

Or P = Kf (where K = V_{cc}^{2}C)

Power consumed by CMOS = P_{static} + P_{dynamic}

**Calculation**:

For f_{1} = 10MHz, P_{consumed} = 100 mW = P_{1 }(Let)

For f_{2} = 15MHz, P_{consumed} = 140 mW = P_{2}

⇒ P_{1} = P_{static} + P_{dynamic}

⇒ 100 mW = P_{static} + Kf_{1}

⇒ 100 mW = P_{static} + K(10 M) …1)

Similarly, P_{2} = 140 mW = P_{static} + K(15 M) …2)

From equation (i) and (ii)

P