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ECE 3120 Microelectronics II Dr. Suketu Naik

Operational Amplifier Circuit Components

1. Ch 7: Current Mirrors and Biasing

2. Ch 9: Frequency Response

3. Ch 8: Active-Loaded Differential Pair

4. Ch 10: Feedback and Compensation

5. Ch 11: Output Stages

6. Ch 12 (tentative): Op Amps

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ECE 3120 Microelectronics II Dr. Suketu Naik

Operational Amplifier

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ECE 3120 Microelectronics II Dr. Suketu Naik

Operational Amplifier: Applications

Inverting Amplifier

- Audio Mixer

- Gain block

- Filters

Instrumentation

Amplifier- Bridge Amplifiers

- Strain Gauge Amplifiers

- Thermocouple Amplifiers

- Differential to Single-

Ended Converters

- Medical Instrumentation

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ECE 3120 Microelectronics II Dr. Suketu Naik

MOSFET OP AMP

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ECE 3120 Microelectronics II Dr. Suketu Naik

Op Amp Circuit Components

Two Stage

Op Amp

(MOSFET)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Current Mirror

Two Stage

Op Amp

(MOSFET)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Active-Loaded Differential Pair

Two Stage

Op Amp

(MOSFET)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Feedback and Compensation

Two Stage

Op Amp

(MOSFET)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Output Stage

Two Stage

Op Amp

(MOSFET)

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ECE 3120 Microelectronics II Dr. Suketu Naik

BJT OP AMP

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ECE 3120 Microelectronics II Dr. Suketu Naik

Three Stage BJT Op-amp

BJT Op Amp in inverting

configuration Current

Mirrors

Active

Load

Diff. Pair

CE Amp

Stage

Class A

Output

Stage (OS)

Biasing

Transistor

for OS

Load

ResistorCompens-

ation Cap

Feedback

Signal

to be

Amplified

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ECE 3120 Microelectronics II Dr. Suketu Naik

Four Stage BJT Op-amp

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ECE 3120 Microelectronics II Dr. Suketu Naik

Current Mirror

Four Stage

Op Amp (BJT)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Differential Pair

Four Stage

Op Amp (BJT)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Differential to Single

Four Stage

Op Amp (BJT)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Level Shifter

Four Stage

Op Amp (BJT)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Output Stage

Four Stage

Op Amp (BJT)

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ECE 3120 Microelectronics II Dr. Suketu Naik

Learning Objectives

1. Learn the process of designing the multi-stage amplifier

2. Learn the basics of IC design

Calculation

Simulation

3. Implement the IC design lessons using discrete

components

Calculation

Simulation

Experiment