Lecture 05 cmos logic gates
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This document discusses CMOS logic gates and compound gates used in microelectronic circuits. It describes the structure and truth tables of basic CMOS gates like NAND and how series and parallel combinations of nMOS and pMOS transistors implement different logic functions. The document also introduces several examples of compound gates including AND-AND-OR-INVERT (AOI22) and OR-OR-INVERT (O3AI) and how they can implement any inverting logic function through different connections of basic gates. Truth tables are provided to illustrate the output logic function for various inputs.
Lecture 05 cmos logic gates
- 1. Dr. S.Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal ICE 4010: MICRO ELECTRO MECHANICAL SYSTEMS (MEMS) Lecture #05 CMOS Logic Gates Dr. S. Meenatchi Sundaram Email: meenasundar@gmail.com 1
- 2. CMOS NAND Gate 2Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal A B Y 0 0 0 1 1 0 1 1 A B Y
- 3. CMOS NAND Gate 3Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal A B Y 0 0 1 0 1 1 0 1 1 A=0 B=0 Y=1 OFF ON ON OFF
- 4. CMOS NAND Gate 4Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal A B Y 0 0 1 0 1 1 1 0 1 1 A=0 B=1 Y=1 OFF OFF ON ON
- 5. CMOS NAND Gate 5Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal A B Y 0 0 1 0 1 1 1 0 1 1 1 A=1 B=0 Y=1 ON ON OFF OFF
- 6. CMOS NAND Gate 6Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal A B Y 0 0 1 0 1 1 1 0 1 1 1 0
- 7. CMOS NAND Gate 7Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
- 8. Series and Parallel 8 • nMOS: 1 = ON • pMOS: 0 = ON • Series: both must be ON • Parallel: either can be ON Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal (a) a b a b g1 g2 0 0 a b 0 1 a b 1 0 a b 1 1 OFF OFF OFF ON (b) a b a b g1 g2 0 0 a b 0 1 a b 1 0 a b 1 1 ON OFF OFF OFF (c) a b a b g1 g2 0 0 OFF ON ON ON (d) ON ON ON OFF a b 0 a b 1 a b 11 0 1 a b 0 0 a b 0 a b 1 a b 11 0 1 a b g1 g2
- 9. Compound Gates 9 • Compound gates can do any inverting function • Ex: Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal (AND-AND-OR-INVERT, AOI22)Y A B C D= +i i A B C D A B C D A B C D A B C D B D Y A C A C A B C D B D Y (a) (c) (e) (b) (d) (f)
- 10. Compound Gates 10 • O3AI • Ex: Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal ( )Y A B C D= + + i A B Y C D DC B A
- 11. Compound Gates 11Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
- 12. Compound Gates 12Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
- 13. Compound Gates 13Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal a b ā ࢈ഥ T1 T2 T3 T4 T5 T6 T7 T8 Y 0 0 1 1 OFF ON ON ON OFF ON OFF OFF OFF 0 1 1 0 ON ON ON OFF OFF OFF OFF ON ON 1 0 0 1 1 1 0 0 T1 T2 T3 T4 T5 T6 T7 T8
- 14. Compound Gates 14 • A EXOR B Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal