Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic COMBINATIONAL LOGIC
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Overview
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Combinational vs. Sequential Logic
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Static CMOS Circuit At every point in time (except during the switching transients) each gate output is connected to either V DD orV ss via a low-resistive path. The outputs of the gates assume at all times the value of the Boolean function, implemented by the circuit (ignoring, once again, the transient effects during switching periods). This is in contrast to the dynamic circuit class, which relies on temporary storage of signal values on the capacitance of high impedance circuit nodes.
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Static CMOS
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic NMOS Transistors in Series/Parallel Connection Transistors can be thought as a switch controlled by its gate signal NMOS switch closes when switch control input is high
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic PMOS Transistors in Series/Parallel Connection
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Complementary CMOS Logic Style Construction (cont.)
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Example Gate: NAND
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Example Gate: NOR
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Example Gate: COMPLEX CMOS GATE
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic 4-input NAND Gate In1In2In3In4 Vdd GND Out
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Standard Cell Layout Methodology
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Two Versions of (a+b).c
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Logic Graph
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Consistent Euler Path
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Example: x = ab+cd
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Properties of Complementary CMOS Gates
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Properties of Complementary CMOS Gates
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Transistor Sizing
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Propagation Delay Analysis - The Switch Model
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic What is the Value of R on ?
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Numerical Examples of Resistances for 1.2 m CMOS
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Analysis of Propagation Delay
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Design for Worst Case
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Influence of Fan-In and Fan-Out on Delay
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic t p as a function of Fan-In
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Fast Complex Gate - Design Techniques
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Fast Complex Gate - Design Techniques (2)
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Fast Complex Gate - Design Techniques (3)
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Fast Complex Gate - Design Techniques (4)
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Example: Full Adder
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic A Revised Adder Circuit
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Ratioed Logic
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Ratioed Logic
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Active Loads
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Load Lines of Ratioed Gates
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Pseudo-NMOS
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Pseudo-NMOS NAND Gate V DD GND
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Improved Loads
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Improved Loads (2)
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Example
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Pass-Transistor Logic
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic NMOS-only switch
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Solution 1: Transmission Gate
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Resistance of Transmission Gate
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Pass-Transistor Based Multiplexer GND V DD In 1 In 2 SS S S
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Transmission Gate XOR
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Delay in Transmission Gate Networks
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Elmore Delay (Chapter 8)
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Delay Optimization
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Transmission Gate Full Adder
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic (2) NMOS Only Logic: Level Restoring Transistor
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Level Restoring Transistor
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Solution 3: Single Transistor Pass Gate with V T =0
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Complimentary Pass Transistor Logic
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic 4 Input NAND in CPL
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Dynamic Logic
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Example
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Transient Response
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Dynamic 4 Input NAND Gate In 1 In 2 In 3 In 4 Out V DD GND
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Reliability Problems — Charge Leakage
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Charge Sharing (redistribution)
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Charge Redistribution - Solutions
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Clock Feedthrough
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Clock Feedthrough and Charge Sharing
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Cascading Dynamic Gates
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Domino Logic
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Domino Logic - Characteristics
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic np-CMOS
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic np CMOS Adder
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic Manchester Carry Chain Adder
Digital Integrated Circuits© Prentice Hall 1995 Combinational Logic CMOS Circuit Styles - Summary