EE 330 Lect 38 Spring 2011

EE 330 Lect 38 Spring 2011 - EE 330 Lecture 38 Digital...

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EE 330 Lecture 38 Digital Circuits Characterization of the CMOS Inverter
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Desirable and/or Required Logic Family Characteristics 1. High and low logic levels must be uniquely distinguishable (even in a long cascade) 2. Capable of driving many loads (good fanout) 3. Fast transition times (but in some cases, not too fast) 4. Good noise margins (low error probabilities) 5. Small die area 6. Low power consumption 7. Economical process requirements Review from Last Time
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Desirable and/or Required Logic Family Characteristics 8. Minimal noise injection to substrate 9. Low leakage currents 10. No oscillations during transitions 11. Compatible with synthesis tools 12. Characteristics do not degrade too much with temperature 13. Characteristics do not vary too much with process variations Are some of these more important than others? Yes ! – must have well-defined logic levels for circuits to even function as logic Review from Last Time
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