17+-+MOSFET+Scaling - Constant Voltage Scaling Constant...

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EECS 320 MOSFET Scaling
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doubling of the number of transistors on integrated circuits every 18 months Moore’s Law
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Constant Field Scaling Constant Field Scaling Introduction Shrinks the transistor dimensions (Z, L, x ox ) and supply voltage by same amount. Keep field profile the same. Original device Scaled device
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Constant Field Scaling(3) Positives Packing density of transistors increases quadratically Power per transistor decreases quadratically Power density remains constant Current density increases linearly Speed increases linearly Avoids reliability and mobility problems problem at high fields Constant Field Scaling Negatives Does not provide compatibility with older circuit technologies (different voltages supplied) The oxide thickness on the gate can only get so small before there is tunneling through the oxide
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Unformatted text preview: Constant Voltage Scaling Constant Voltage Scaling • Introduction – Shrinks the transistor dimensions linearly – Leaves the applied voltage constant • Positives – Speed increases quadratically – Packing density increases quadratically • Negatives – Electric field increases by same factor used to scale transistor dimensions – Degradation of device performance and reliability at high fields. – Power density (heat dissipation) increases as cubically Constant Voltage Scaling A mix of constant voltage and constant field scaling has been used Challenges to Sustain Scaling http://public.itrs.net/ ITRS: International Technology Roadmap for Semiconductors ITRS2005: Process Integration, Devices, and Structures (PIDS)...
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This note was uploaded on 08/09/2011 for the course EE 320 taught by Professor Zhongzhaohui during the Summer '11 term at Shanghai Jiao Tong University.

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17+-+MOSFET+Scaling - Constant Voltage Scaling Constant...

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