L-scale 5. routing optimization 6. The main power consumption in CMOS circuits comprises two forms of power, dynamic power consumption P dynamic and static power consumption P static, as indicated by Eq.

Historically, biggest has been dynamic power… dd static dd leak r f L dd dd peak V I V I f t t C V f V I + + ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + = + 2 α 2 D L dd I … However even in this `steady state`, there are some leakage currents in the device which contribute to the leakage power. 3. Advanced Topics in VLSI Systems. Interesting question: You can minimize the dissipation of CMOS by scaling some factors 1. threshold voltages scaling 2. transistor minimization tuff but in some logics, you can minimize. Vin Vout C L Vdd From equation, not a function of transistor sizes! It occurs in CMOS when input of gate switches. Outline of the Talk • Power and Energy • Dynamic Power • Static Power • Low Power Design 2 . ( 8 ).

I. all inputs are at held valid levels, there is no switching activity and and the circuit is not charging. W - scale 4. Static power is the power consumed while the circuit is inactive or idle.
during this scenario spikes will be generated momentarily in the current as shown in fig below.The current is flowing from VDD to VSS is also called cross-bar current. Lecture 3: Power Dissipation NOTE: The figures, text etc included in slides are borrowed from various books, websites, authors pages, and other sources for academic purpose only. Power dissipation is defined as the rate of energy delivered from source to system. 7: Power CMOS VLSI Design 4th Ed. When both pullup and pulldown networks are conducting for a small duration and there is a direct path b/w VDD to VSS. Dynamic Power Dissipation Energy/transition Power = Energy/transition * f = C L * V dd 2 * f Need to reduce C L, V dd, and f to reduce power. This power dissipation doesn’t depend on input conditions or load capacitance, but is dependent on the device.

Power Optimization Techniques at Circuit and ... CMOS,power reduction,circuit,VLSI, device, leakage current, transistor stacking,dynamic power, static power, short circuit power, variable threshold, variable supply, clock gating. 10 Power Dissipation Sources P total = P dynamic + P static Dynamic power: P dynamic = P switching + P shortcircuit – Switching load capacitances – Short-circuit current Static power: P static = (I sub + I gate + I junct + I contention)V DD – … The instructor does not claim any originality. INTRODUCTION . i.e. Dynamic power includes a short circuit power component. CMOS Delay and Power Dissipation P TOT =P dyn +P sc +P stat +P leak Total Power: To reduce power, minimize each term – starting with the biggest! The static power consumption, also known as idle power or leakage, is the dominant source of power consumption in circuits [ 13 ], persisting whether a computer is active or idle.

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