Sub-threshold Design for Ultra Low-Power Systems (Integrated by Alice Wang, Anantha P. Chandrakasan, Benton Highsmith

By Alice Wang, Anantha P. Chandrakasan, Benton Highsmith Calhoun

In keeping with the paintings of MIT graduate scholars Alice Wang and Benton Calhoun, this booklet surveys the sector of sub-threshold and low-voltage layout and explores such elements of sub-threshold circuit layout as modeling, good judgment and reminiscence circuit layout. One very important bankruptcy of the booklet is devoted to optimizing strength dissipation - a key metric for strength restricted designs. This publication additionally comprises invited chapters almost about analog sub-threshold circuits.

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Additional resources for Sub-threshold Design for Ultra Low-Power Systems (Integrated Circuits and Systems)

Example text

2) In an inverter test circuit, the authors use feedback to control the voltage to the wells in order to match the nMOS and pMOS current. 5V. 70mV inverter operation was demonstrated with a threshold voltage of zero volts. The authors showed 200mV operation lower energy than the minimum voltage point. Again, this shows that in deep sub-micron technologies the leakage currents make minimum voltage operation less energy efficient. In 2002, Ono derived another minimum voltage limit by equating the nMOS and pMOS threshold voltages [79].

The leakage for the given operation stays constant, however, so the minimum energy point moves to lower energy and higher voltage with decreasing workload. Duty cycle, d, also can vary widely. g. 5 VDD (V) Fig. 14. Energy versus VJDD for changing duty cycle. for each completed active operation. 18). 14 shows the impact of a changing duty cycle on the energy characteristics of the FIR filter. Again, a wide range of values is shown for the duty cycle. The longer idle time spent for each operation means t h a t leakage energy increases, but the active energy stays constant.

Fig. 6. 8V. 6 shows standard IQ versus Vos curves for strong inversion. The current in this plot clearly demonstrates the linear region and the velocity saturation region (not saturation, because ID changes linearly with VGS instead of quadratically). 7 shows the same curves in sub-threshold. The curves show the exponential dependence on VGS-, but they otherwise appear quite similar to the strong inversion curves in their shape. 3). 5 VDS(V) Fig. 7. lS^m process, but VDD = 500mV, so the inverter is in the sub-threshold region.

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