Introdcution

1
Introdcution
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Applications of Op-Amps
(Active filter)
Question How do you build a 741 op-amp? What
is inside the package?
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741 Op-Amp
Bipolar junction transistor
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Order of Presentation

• Diode
• Device Physics
• Circuit Design
• Bipolar junction transistor
• Device Physics
• Circuit Design
• Complementary Metal Oxide Semiconductor
• Device Physics
• Circuit Design

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Device Physics
Electrons are injected into the BC junction
Electrons are injected into the B holes to the E.
Electrons are swept across the reversed biased BC
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Bipolar Junction Transistor Implementation of
7400 Gate
(We will learn to work with BJTs in ES230)
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2-Input NAND Gate
F can only be pulled down if both AB1. F will
be pulled up if either A or B is 0 V.
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So far

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

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Design Circuits Systematically

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