DYNAMIC ELEMENT MATCHING (DEM)

1
DYNAMIC ELEMENT MATCHING(DEM)

• Presented By
• Raf Karakiewicz

2
Presentation Outline

• With vs. Without DEM

• Technical Aspects

• Published Results

3
DAC (No DEM)
E N C O D E R
S U M
1-bit DAC
1-bit DAC
1-bit DAC
1-bit DAC
3

1-bit DAC
Xn
1-bit DAC
-
1-bit DAC
1-bit DAC
4
DAC (No DEM)
E N C O D E R
S U M
1-bit DAC
1-bit DAC
1-bit DAC
1-bit DAC
3

1-bit DAC
Xn
1-bit DAC
-
1-bit DAC
1-bit DAC
5
DAC (No DEM)
E N C O D E R
S U M
1-bit DAC
1-bit DAC
1-bit DAC
1-bit DAC
3

1-bit DAC
Xn
1-bit DAC
-
1-bit DAC
1-bit DAC
6
Higher Resolution

• Without DEM
• Laser Trimming
• Digital calibration
• Careful layout

• With DEM
• Flawed-elements taken as they are

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

1-bit DAC
Xn
1-bit DAC
-
1-bit DAC
1-bit DAC
8
DAC (With DEM)
DEM Code
E N C O D E R
S U M
S C R A M B L E R
1-bit DAC
1-bit DAC
1-bit DAC
1-bit DAC
3

1-bit DAC
Xn
1-bit DAC
-
1-bit DAC
1-bit DAC
9
DAC (With DEM)
DEM Code
E N C O D E R
S U M
S C R A M B L E R
1-bit DAC
1-bit DAC
1-bit DAC
1-bit DAC
3

1-bit DAC
Xn
1-bit DAC
-
1-bit DAC
1-bit DAC
10
DAC (With DEM)
DEM Code
E N C O D E R
S U M
S C R A M B L E R
1-bit DAC
1-bit DAC
1-bit DAC
1-bit DAC
3

1-bit DAC
Xn
1-bit DAC
-
1-bit DAC
1-bit DAC
11
Novelty?

• DEM Algorithms
• How many switches?
• RC ladder (L1, L2, )
• How to switch?
• Glitches
• How many samples per sum?
• Accuracy

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Novelty?
S U M
S C R A M B L E R
1-bit DAC

• DEM Algorithms
• How many switches?
• RC ladder (L1, L2, )
• How to switch?
• Glitches
• How many samples per sum?
• Accuracy

1-bit DAC
1-bit DAC
1-bit DAC

1-bit DAC
1-bit DAC
-
1-bit DAC
1-bit DAC
13
Novelty?

• DEM Algorithms
• How many switches?
• RC ladder (L1, L2, )
• How to switch?
• Glitches
• How many samples per sum?
• Accuracy

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Quantization Noise
Mismatch Noise
Mismatch Noise DEM L2
Mismatch Noise DEM L3
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Noise Shaping
Mismatch Noise First Order DEM
Mismatch Noise Second Order DEM
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What to take away from this presentation?
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References

• 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
• 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
• 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
• 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 7th IEEE International Conference on ,
  Volume 1 , 17-20 Dec. 2000
• 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