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Analog CMOS Integrated Circuit Design Opamp Design
References: “Analog Integrated Circuit Design” by D. Johns and K. Martin and “Design of Analog CMOS Integrated Circuits” by B. Razavi All figures in this set of slides are taken from the above books Dr. Jawdat Abu-Taha Department of Electrical and Computer Engineering Islamic University of Gaza 1
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General Considerations
• Gain Small-signal bandwidth Large-signal performance Output swing Input common-mode Linearity range • Noise/offset Supply rejection 2
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One-Stage Op Amps 3
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One-Stage Op Amp in Unity Gain
Configuration 4
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Cascode Op Amps 5
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Unity Gain One Stage Cascode 6
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Folded Cascode Op Amps EECE488 Set 7 - Opamp Design 7
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Folded Cascode Stages 8
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Folded Cascode (cont.) 9
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Folded Cascode (cont.) 10
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Telescopic versus Folded Cascode 11
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Example Folded-Cascode Op Amp 12
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Single-Ended Output Cascode Op Amps 13
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Triple Cascode 14
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Output Impedance Enhancement 15
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Gain Boosting in Cascode Stage 16
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Differential Gain Boosting SM EECE488 Set 7 - Opamp Design 17
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Differential Gain Boosting
SM 18 EECE488 Set 7 - Opamp Design
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Differential Gain Boosting SM 19 EECE488 Set 7 - Opamp Design
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Two-Stage Op Amps SM 20 EECE488 Set 7 - Opamp Design
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Single-Ended Output Two-Stage Op Amp SM 21
EECE488 Set 7 - Opamp Design
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Two-Stage CMOS Opamp
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Two-Stage CMOS Opamp Example 23
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Gain of the Opamp 24
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Gain of the Opamp 25
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Frequency Response 26
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Frequency Response 27
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Frequency Response 28
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Frequency Response 29
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Slew Rate 30
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Slew Rate 31
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Slew Rate 32
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Systematic Offset Voltage
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Systematic Offset Voltage 34
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N-Channel versus P-Channel Input Stage
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Feedback and Opamp Compensation 36
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Stable and Unstable Systems 37
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Time-domain response of a feedback system 38
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One-pole system 39
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Multi-pole system 40
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Phase Margin 41
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Phase Margin 42
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Phase Margin (Cont.) 43
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Phase Margin (Cont.) 44
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Phase Margin (Cont.) 45
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Frequency Compensation 46
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Telescopic Opamp (single-ended) -example 47
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Compensation (Cont.) • Assume we need a phase margin of 45o (usually
inadequate) frequency. and other non-dominant poles are at high 48
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Compensation of a two-stage opamp 49
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Compensating Two-Stage Opamps 50
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Compensating Two-Stage Opamps 51
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Compensating Two-Stage Opamps
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Design Procedure 53
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Design Procedure 54
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Design Procedure 55
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Process and Temperature Independence
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Process and Temperature Independence
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Process and Temperature Independence 58
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Stable Transconductance Biasing 59
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Stable Transconductance Biasing
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