Introdcution

Applications of Op-Amps

(Active filter)

Question: How do you build a 741 op-amp?What is inside the package?

741 Op-Amp

Bipolar junction transistor

Order of Presentation

• Diode– Device Physics

–Circuit Design • Bipolar junction transistor

– Device Physics

– Circuit Design • Complementary Metal Oxide

Semiconductor– Device Physics

– Circuit Design

Device Physics

Electronsare injectedinto the BC junction

Electrons are injected into the B; holes to the E.

Electronsare swept acrossthe reversed biased BC

Bipolar Junction Transistor Implementation of 7400 Gate

(We will learn to work with BJTs in ES230)

2-Input NAND Gate

F can only be pulled down if both A=B=1.

F will be pulled up if either A or B is 0 V.

So far

• Device Physics• Transistor level design• Build circuits using transistors– Using breadboard– On PCB

Design Circuits Systematically

• Analytical Calculation• Matlab • Using Cadence (Linux Based)• Build proto-type– Breadboard– PCB