DYNAMIC ELEMENT MATCHING (DEM) - PowerPoint PPT Presentation

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DYNAMIC ELEMENT MATCHING (DEM)

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Laser Trimming. Digital calibration. Careful layout. With DEM. Flawed-elements taken as they are ... What to take away from this presentation? References ... – PowerPoint PPT presentation

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Title: 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

7
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

12
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

14
Quantization Noise
Mismatch Noise
Mismatch Noise DEM L2
Mismatch Noise DEM L3
15
Noise Shaping
Mismatch Noise First Order DEM
Mismatch Noise Second Order DEM
16
What to take away from this presentation?
17
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
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