operational-amplifier and data-converter circuitskttang/course/slides/ee2260/week17.pdf ·...
TRANSCRIPT
![Page 1: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/1.jpg)
Operational-Amplifier andData-Converter Circuits
![Page 2: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/2.jpg)
Outline
•The Two-Stage CMOS Op Amp•The Folded-Cascode CMOS Op Amp•The 741 Op-Amp Circuit•DC Analysis of the 741•Small-Signal Analysis of the 741•Gain, Frequency Response, and Slew Rate of
the 741•Data Converters- An Introduction•D/A Converter Circuits•A/D Converter Circuits
![Page 3: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/3.jpg)
Sampling of Analog SignalsSample-and-hold (S/H)
![Page 4: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/4.jpg)
A/D and D/A Functional Blocks
Sample-and-hold
After Filtering
![Page 5: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/5.jpg)
Outline
•The Two-Stage CMOS Op Amp•The Folded-Cascode CMOS Op Amp•The 741 Op-Amp Circuit•DC Analysis of the 741•Small-Signal Analysis of the 741•Gain, Frequency Response, and Slew Rate of
the 741•Data Converters- An Introduction•D/A Converter Circuits•A/D Converter Circuits
![Page 6: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/6.jpg)
Binary-Weighted Resistors
NNbbb
D222 2
211
bN: least significant bit (LSB)b1: most significant bit (MSB)
io =
vo = The spread between resistances is large!!
R-2R ladder !!
![Page 7: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/7.jpg)
R-2R Ladders
io =
How to actually generate these currents? Current Sources
![Page 8: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/8.jpg)
Practical Circuit Implementation
VN =
VN-1 =
How to make the switches?
![Page 9: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/9.jpg)
Current Switches Implementation
How to eliminate the base current? MOSFET !!
![Page 10: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/10.jpg)
Outline
•The Two-Stage CMOS Op Amp•The Folded-Cascode CMOS Op Amp•The 741 Op-Amp Circuit•DC Analysis of the 741•Small-Signal Analysis of the 741•Gain, Frequency Response, and Slew Rate of
the 741•Data Converters- An Introduction•D/A Converter Circuits•A/D Converter Circuits
![Page 11: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/11.jpg)
Feedback-Type Converter
Slow if the converter starts from zeroTrack incremental changes in the input rapidly
![Page 12: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/12.jpg)
Dual-Slope A/D Converter
![Page 13: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/13.jpg)
Dual-Slope A/D Converter (con’t)
Slow ConversionHigh AccuracyIndependent of exact values of R and C
![Page 14: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/14.jpg)
Parallel or Flash Converter
Rather complex circuit implementationFast –Can be complete within one clock cycle
![Page 15: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/15.jpg)
Charge-Redistribution Converter
Sample Phase
![Page 16: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/16.jpg)
Charge-Redistribution Converter
Hold Phase
![Page 17: Operational-Amplifier and Data-Converter Circuitskttang/Course/Slides/EE2260/Week17.pdf · Sample-and-hold (S/H) A/D and D/A Functional Blocks Sample-and-hold After Filtering. Outline](https://reader031.vdocument.in/reader031/viewer/2022022500/5aa3f4447f8b9a436d8ed9b4/html5/thumbnails/17.jpg)
Charge-Redistribution Converter
Charge-Redistribution Phase
Reasonable accurate conversionModerate speed