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Types of Operational Amplifiers

Types of Operational Amplifiers. 1. - Introduction - Single Stage Op-Amplifier - Folded Cascode Op-Amplifier - Design and Analysis Two Stage Op-Amplifier. outline . 2.

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Types of Operational Amplifiers

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  1. Types of Operational Amplifiers 1

  2. - Introduction • - Single Stage Op-Amplifier • - Folded Cascode Op-Amplifier • - Design and Analysis Two Stage Op-Amplifier outline 2

  3. It easy to define an Op-Amp. as "a high gain deferential amplifier". It is mean that a value that is adequate for the application. The gain could be anywhere from 101 to 106 . • Many other aspects of performance had to sacrificed; such as power, output swing and speed. • Most of today s' CMOS op-amp have a high output impedance (in open loop). As such, they called "transconductance amplifiers". Introduction 3

  4. - Widely used building blocks for analog circuits, Mixed • Signals. • - Widely used in analog signal processing and • communication circuits Specifications Requirements - High DC Gain - Large Gain-Bandwidth/ High Speed - Sufficient Output Swing - High power efficiency Role of Op-Amplifiers 4

  5. 1-Single Stage Op-Amp. The MOSFET converts the input gate-source voltage to drain current, which can pass through a load to generate an output voltage. 5

  6. 2- CascodeAmplifier DC Gain: High Speed: Excellent Power diss.: High Freq. Response: Good Output Swing: Small 6

  7. 3- Two Stage Op-Amp Design and analysis DC Gain: Modest Speed: Good Power diss. : Good Freq. Response: Good Output Swing: Good 7

  8. 3- Two Stage Op-Amp Design and analysis 8

  9. Frequency response AV p1 p2 z2 z1 w UGF -90 PM -180 9

  10. HOMEWORK • Design a two-stage CMOS Op-Amp. by using a 0.18 µTechnology and calculate the aspect ratio of each PMOS and NMOS. The design parameters are: 10

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