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Gradient error cancellation and quadratic error reduction in unary and binary D/A converters

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1 Author(s)
Vadipour, M. ; Sierra Monolithics, Redondo Beach, CA, USA

A novel geometrical arrangement of unit cells in a digital-analog converter (D/A) converter, along with a new switching sequence results in full cancellation of gradient errors. This is achieved without using quad, quad-quad, or triple-quad techniques which increase the number of units by a factor of 4 or 16. In an M-b D/A, by proper arrangement of (2M-1) units in a matrix having odd number of rows and odd number of columns, a central unit is established allowing complete cancellation of gradient errors. The decoding logic has the same simplicity of a standard row-column decoder with the advantage of being half in size. This technique, called "symmetric-pair switching," avoids large routing between multiple subunits in quad, quad-quad and triple-quad techniques thus improving D/A performance. Another independent technique, "balanced-ring switching," is introduced for reduction of quadratic errors. This technique achieves an order of magnitude reduction in quadratic errors compared to the "Q2 Random Walk" technique.

Published in:

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:50 ,  Issue: 12 )

Date of Publication:

Dec. 2003

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