1. 1 Tai-Cheng Lee Fall 2009 Ch9: Data-Converter Circuits Tai-Cheng Lee Electrical Engineering/GIEE, NTU

2. 2 Tai-Cheng Lee Fall 2009 Microelectronics Instructor: 李泰成 (tlee@cc.ee.ntu.edu.tw) Office: EE-II 445 Temp Web: http://everest1.ee.ntu.edu.tw/course TA :TBD Textbook: Sedra/Smith Microelectronic Circuits 5/e

3. 3 Tai-Cheng Lee Fall 2009 Data Converter Why data converter? Ex1: Gigabit Ethernet Ex2:Optical Mouse

4. 4 Tai-Cheng Lee Fall 2009 Sampling Sampling of analog signal

5. 5 Tai-Cheng Lee Fall 2009 Quantization Noise Full-scale voltage Quantization

6. 6 Tai-Cheng Lee Fall 2009 ADC and DAC Function Blocks Analog-to-Digital Converter (ADC) Digital-to-Analog Converter (DAC)

7. 7 Tai-Cheng Lee Fall 2009 Digital-to-Analog Converter (I) Basic circuit using binary-weighted resistor

8. 8 Tai-Cheng Lee Fall 2009 Digital-to-Analog Converter (II) Binary-weighted circuits results in significant area → R-2R Ladder

9. 9 Tai-Cheng Lee Fall 2009 Digital-to-Analog Converter (III) Practical DAC implementation

10. 10 Tai-Cheng Lee Fall 2009 Digital-to-Analog Converter (IV) Current-Steering Technique

11. 11 Tai-Cheng Lee Fall 2009 Analog-to-Digital Converter (I) ADC (1) Slow : SAR (successive approximation), Dual-Slope (2) Fast: Flash, Two-step, Pipeline, Folding Even more accurate?? Trade accuracy with speed

12. 12 Tai-Cheng Lee Fall 2009 Analog-to-Digital Converter (II) Feedback-type converter Algorithm

13. 13 Tai-Cheng Lee Fall 2009 Analog-to-Digital Converter (III) Dual-slope ADC

14. 14 Tai-Cheng Lee Fall 2009 Analog-to-Digital Converter (IV) Parallel or Flash ADC

15. 15 Tai-Cheng Lee Fall 2009 Analog-to-Digital Converter (V) Charge redistribution ADC

16. 16 Tai-Cheng Lee Fall 2009 Analog-to-Digital Converter (VI) More on charge redistribution ADC