DYNAMIC ELEMENT MATCHING DEM Presented By Raf Karakiewicz

DYNAMIC ELEMENT MATCHING (DEM) Presented By: Raf Karakiewicz

Presentation Outline n With vs. Without DEM n Technical Aspects n Published Results

DAC (No DEM) 3 X[n] E N C O D E R 1 -bit DAC 1 -bit DAC S U M + -

Higher Resolution n Without DEM ¨ Laser Trimming ¨ Digital calibration ¨ Careful layout n With DEM ¨ Flawed-elements taken as they are

DAC (With DEM) 3 X[n] E N C O D E R S C R A M B L E R DEM Code 1 -bit DAC 1 -bit DAC S U M + -

Novelty? n DEM Algorithms ¨ How many switches? n RC ladder (L 1, L 2, … ) ¨ How to switch? n Glitches ¨ How many samples per sum? n Accuracy

Novelty? n DEM Algorithms ¨ How many switches? n RC ladder (L 1, L 2, … ) ¨ How to switch? n Glitches ¨ How many samples per sum? n Accuracy S C R A M B L E R 1 -bit DAC 1 -bit DAC S U M + -

Novelty? n DEM Algorithms ¨ How many switches? n RC ladder (L 1, L 2, … ) ¨ How to switch? n Glitches ¨ How many samples per sum? n Accuracy

Quantization Noise Mismatch Noise DEM L 2 Mismatch Noise DEM L 3

Noise Shaping Mismatch Noise First Order DEM Mismatch Noise Second Order DEM

What to take away from this presentation?

References n [1] A low-complexity dynamic element matching technique for reduced-distortion digital-to -analog conversion Jensen, H. T. ; Jensen, J. F. ; Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on , Volume: 2 , 30 May-2 June 1999 n [2] A performance analysis of the partial randomization dynamic element matching DAC architecture Jensen, H. T. ; Galton, I. ; Circuits and Systems, 1997. ISCAS '97. , Proceedings of 1997 IEEE International Symposium on , Volume: 1 , 9 -12 June 1997 n [3] Dynamic element matching techniques with arbitrary noise shaping function Henderson, R. K. ; Nys, O. J. A. P. ; Circuits and Systems, 1996. ISCAS '96. , 'Connecting the World'. , 1996 IEEE International Symposium on , Volume: 1 , 12 -15 May 1996 n [4] Dynamic element matching in D/A converters with restricted scrambling Vesterbacka, M. ; Rudberg, M. ; Wikner, J. J. ; Andersson, N. U. ; Electronics, Circuits and Systems, 2000. ICECS 2000. The 7 th IEEE International Conference on , Volume: 1 , 17 -20 Dec. 2000 n [5] An analysis of dynamic element matching techniques in sigma-delta modulation Nys, O. J. A. P. ; Henderson, R. K. ; Circuits and Systems, 1996. ISCAS '96. , 'Connecting the World'. , 1996 IEEE International Symposium on , Volume: 1 , 12 -15 May 1996