Low-Power CMOS Circuits: Technology, Logic Design and CAD Tools

By Christian Piguet

The ability intake of microprocessors is without doubt one of the most crucial demanding situations of high-performance chips and conveyable units. In chapters drawn from Piguet's lately released Low-Power Electronics layout, Low-Power CMOS Circuits: know-how, good judgment layout, and CAD instruments addresses the layout of low-power circuitry in deep submicron applied sciences. It presents a centred reference for experts enthusiastic about designing low-power circuitry, from transistors to common sense gates.

The e-book is equipped into 3 huge sections for handy entry. the 1st examines the background of low-power electronics besides a glance at rising and attainable destiny applied sciences. It additionally considers different applied sciences, similar to nanotechnologies and optical chips, which may be worthy in designing built-in circuits. the second one half explains the ideas used to lessen strength intake at low degrees. those comprise clock gating, leakage aid, interconnecting and communique on chips, and adiabatic circuits. the ultimate part discusses a variety of CAD instruments for designing low-power circuits. This part comprises 3 chapters that reveal the instruments and low-power layout matters at 3 significant businesses that produce good judgment synthesizers.

Providing special examinations contributed by means of top specialists, Low-Power CMOS Circuits: expertise, common sense layout, and CAD instruments offers authoritative details on the right way to layout and version for prime functionality with low strength intake in glossy built-in circuits. it's a must-read for someone designing sleek desktops or embedded platforms.

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VDD . C OX . LGEO (6. 26) 6. five. 2 software the applying of the sizing criterion (Equation 6. 26) to an inverter tree is sort of common, processing backward from the output to the enter of the tree; despite the fact that, either the issues of divergence branches and of the output drivers need to be thought of. In minimizing the full strength dissipated in an inverter tree, it seems that the optimum sizing of the output drivers relies strongly at the load content material. for instance, in optimizing the common sense that drives a sign in or subsequent gates, it may be thought of that the output load is an energetic load or the sum of lively and passive quite a bit. for that reason, the sizing of the output motive force should be played utilizing Equation 6. 25. If the output driving force controls a passive load, notwithstanding, no short-circuit energy dissipation happens within the load, and the driving force needs to be sized on the minimal worth gratifying the hold up constraint. The case of divergence branches provides a problem as the sizing criterion constructed within the previous part doesn't let predicting the optimum sizing of the (i-1). The followed answer relies at the proven fact that the facility is an additive attribute of the constitution. To justify this procedure, allow us to think of the constitution represented in determine 6. nine. © 2006 via Taylor & Francis team, LLC 9537_Book. fm web page 15 Friday, July eight, 2005 1:31 PM 6-15 Modeling for Designing in Deep Submicron applied sciences The sizing criterion (Equation 6. 26) offers the optimum price of Ci-1 provided that CL1 = CL2, within which case the 2 inverters should be lumped in a special inverter with an enter gate capacitance equivalent to Ci(a) + Ci(b). In a common configuration, notwithstanding, CL1 and CL2 have diversified values. however, because the short-circuit energy dissipation is a reducing functionality of CL, the 2 inverters (a) and (b) are modeled through a special inverter (Figure 6. 9b) loaded by means of CL=MAX(CL1,CL2) to prevent any overestimation of the short-circuit strength dissipated via (a) and (b). 6. five. three Validation This sizing heuristic, in accordance with the sizing criterion outlined by way of Equation 6. 25, has been utilized to an inverter tree represented within the determine 6. 10. the complete energy dissipated within the diverse implementations has been bought from SPICE simulations. determine 6. eleven illustrates the ability achieve and loss values got while evaluating the proposed sizing strategy to a minimum floor implementation. assorted values of the parasitic routing capacitance P are thought of to demonstrate the sensitivity of the outcome to the parasitic content material of the burden. x11 x1 x2 x12 x13 five fF 30 fF x3 P x9 x10 five fF x4 x5 x6 x7 x8 20 fF P x14 x15 five fF 60% profits determine 6. 10 illustration of the inverter tree configuration used to validate the sizing criterion (Equation 6. 25). lively strength floor overall energy hold up 50% forty% 30% 20% P = 20f −10% −15% P = 40f P = 60f X15 X10 X8 X13 X15 X10 X8 X13 X15 X10 X8 X13 zero% LOSSES X15 X10 X8 X13 10% P = 120f determine 6. eleven achieve and loss in hold up, energy, and region received at the inverter tree for various values of the parasitic capacitance P = P3,4 = P5,6.

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