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CMOS Operational Amplifier Design Lesson 2 pp. 1-36 13/11/2006 D. De Venuto 1

Lesson 2 CMOS Op Amp Design

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CMOS Operational Amplifier Design

Lesson 2pp. 1-36

13/11/2006 D. De Venuto 1

Two stage op amp design

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DC Balance conditions for the two stage op amp

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Design relationships for the two stage op amp

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Op Amp specification

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Unbuffered Op Amp Design Procedure

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Unbuffered Op Amp Design Procedure

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Unbuffered Op Amp Design Procedure

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Example 1 Design of a two-stage op amp

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Example 1

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Example 1

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Example 1

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Example 1

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Incorporating the nulling resistor into the Miller compensated two-stage op amp

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Design of the nulling resistor (M8)

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Example 2 – RHP Zero Compensation

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Example 2

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An alternate form of nulling resistor

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Programmability of the two-stage op amp

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Simulation of the electrical design

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5-to-1 Current Mirror with different physical performances

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Reduction of Parasitics

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Technique for reducing the overlap capacitance

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Chip voltage bias distribution scheme

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PSRR of the two-stage op amp

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Positive PSRR of the two-stage op amp

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Positive PSRR of the two-stage op amp

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Positive PSRR of the two-stage op amp

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Concept of the PSRR+ for the two-stage op amp

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Negative PSRR of the two-stage op amp with Vbias, grounded

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Negative PSRR of the two-stage op amp with Vbiasgrounded

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Negative PSRR of the two-stage op amp with Vbiasconnected to VSS

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Negative PSRR of the two-stage op amp with Vbiasconnected to VSS

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Frequency response of the negative PSRR of the two-stage op amp with VBias connected to VSS

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Approximate model for negative PSRR with VBiasconnected to ground

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Approximate model for negative PSRR with VBiasconnected to VSS

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