Chapter 6 the NMOS Family of Logic Circuit

6. The NMOS Family of Logic Circuits

- Dr. Surendra ShresthaDepartment of Electronics and Computer Engineering

Pulchowk Campus, Institute of Engineering, T.U.

6.1 NMOS Inverter with a Resistive Load

6.2 NMOS Inverter with Enhancement Load

6.3 NMOS Inverter with Depletion Load

6.4 Some Popular NMOS Digital Logic Circuit

Text Book: D.A. Neamen, Electronic Circuits Analysis And Design, 2nd ed. Chapter 16.

2Department of Electronics and Computer EngineeringPulchowk Campus, Institute of Engineering, T.U.

- In the late 70s as the era of LSI and VLSI began,

NMOS became the fabrication technology of choice.

- Later the design flexibility and other advantages of

the CMOS were realized, CMOS technology then

replaced NMOS at all level of integration.

- The small transistor size and low power dissipation of

CMOS circuits, demonstration principal advantages

of CMOS over NMOS circuits.

NMOS Inverter:

NMOS Inverter: … …

- For any IC technology used in digital circuit

design, the basic circuit element is the logic

inverter.

- Once the operation and characterization of an

inverter circuits are thoroughly understood,

the results can be extended to the design of

the logic gates and other more complex

circuits.

n-channel MOSFET: … …

Simplified view

The channel length is the same for all transistor, while channel width is variable

Detail cross-sectional view

p-channel MOSFET :

substrate or body terminal;

Circuit symbol

Simplified circuits symbols

for n-channel MOSFETs

n-channel MOSFET Formulas: … …

NMOS Inverter :

NMOS Inverter with resister load: … …

Numerical Example:

n-channel MOSFET connected as saturated load device:

NMOS Inverter with Enhancement load:

NMOS Inverter with Enhancement load: …

NMOS Inverter with Resister load: …

Numerical problems:

Summary of Transistor operation :

NMOS Inverter with Depletion Mode:

n-Channel Depletion Mode MOSFET:

NMOS Inverter with Depletion Mode: … …

Tutorial:

NMOS logic circuit are constructed

by connecting driver transistor in

parallel, series or series-parallel

combinations to produce required

output logic function

NMOS Logic Circuits:

NMOS NOR Gate:

NMOS NOR Gate: … …

Tutorial:

NMOS NAND Gate:

NMOS Logic Circuit :

Fan-In & Fan-Out:

Transient Analysis of NMOS Inverters:

Switching characteristics of an NMOS inverter with depletion load

Transient Analysis of NMOS Inverters:

Chapter 6 the NMOS Family of Logic Circuit

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