06EC55 - DIGITAL SWITCHING SYSTEMS |
PART – A |
UNIT – I |
BASIC MOS TECHNOLOGY:Integrated circuit’s era. Enhancement and
depletion mode MOS transistors. nMOS fabrication. CMOS fabrication.
Thermal aspects of processing. BiCMOS technology. Production of E-beam
masks.
MOS TRANSISTOR THEORY: Introduction, MOS Device Design
Equations, The Complementary CMOS Inverter – DC Characteristics, Static
Load MOS Inverters, The Differential Inverter, The Transmission Gate,
Tristate Inverter. |
UNIT – II CIRCUIT DESIGN PROCESSES: |
MOS layers. Stick diagrams. Design
rules and layout – lambda-based design and other rules. Examples. Layout
diagrams. Symbolic diagrams. Tutorial exercises.Basic Physical Design of Simple logic gates. |
UNIT – III CMOS LOGIC STRUCTURES: |
CMOS Complementary Logic, Bi CMOS
Logic, Pseudo-nMOS Logic, Dynamic CMOS Logic, Clocked CMOS Logic,
Pass Transistor Logic, CMOS Domino Logic Cascaded Voltage Switch
Logic (CVSL). |
UNIT – IV |
BASIC CIRCUIT CONCEPTS:Sheet resistance. Area capacitances.
Capacitance calculations. The delay unit. Inverter delays. Driving capacitive
loads. Propagation delays. Wiring capacitances.SCALING OF MOS CIRCUITS: Scaling models and factors. Limits on
scaling. Limits due to current density and noise. |
PART – B |
UNIT – V CMOS SUBSYSTEM DESIGN: |
Architectural issues. Switch logic. Gate
logic. Design examples – combinational logic. Clocked circuits. Other system
considerations.Clocking Strategies |
UNIT – VI CMOS SUBSYSTEM DESIGN PROCESSES: |
General considerations.
Process illustration. ALU subsystem. Adders. Multipliers. |
UNIT – VII MEMORY, REGISTERS AND CLOCK: |
Timing considerations. Memory
elements. Memory cell arrays. |
UNIT – VIII TESTABILITY: |
Performance parameters. Layout issues. I/O pads. Real
estate. System delays. Ground rules for design. Test and testability. |
REFERENCE |
TEXT BOOKS: |
1. Telecommunication and Switching, Traffic and Networks - J E
Flood: Pearson Education, 2002.
2. Digital Switching Systems, Syed R. Ali, TMH Ed 2002. |
Reference Books |
1. Digital Telephony - John C Bellamy: Wiley India 3rd Ed, 2000. |