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Method and apparatus for mismatched shaping of an oversampled converter
| Details |
Inventors: Brooks, Todd L.; Ho, David S. P.; Miller, Kevin L.; Fogleman, Eric;
Assignee: Broadcom Corporation (Irvine, CA)
Primary Examiner: JeanPierre; Peguy
Assistant Examiner: Jeanglaude; Jean Bruner
Attorney, Agent or Firm: Sterne, Kessler, Goldstein & Fox P.L.L.C.
Methods and apparatuses for spectrally shaping mismatch errors in a multi-bit digital to analog converter (DAC). In an embodiment, the multi-bit DAC is constructed from K separate multi-element sub-DACs, where K and the number of elements in each sub-DAC are each preferably greater than two. A received digital input code is split into a set of K sub-codes corresponding to the digital input code. The set of K sub-codes can have one of at least N different sub-code orders that specify an order of each of the K sub-codes with respect to one another, where N>2. A sum of the K sub-codes equals the digital input code. One of the at least N different sub-code orders is selected using a shuffling algorithm. Then, each sub-code in the set of K sub-codes is output in accordance with the selected sub-code order. |
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DETAILED DESCRIPTION An embodiment of the present invention is directed to a method and apparatus for spectrally shaping mismatch errors in a multi-bit digital to analog converter (DAC) constructed from K separate multi-element sub-DACs, where K and the number of elements in each sub-DAC are each preferably greater than two.
A received digital input code is split into a set of K sub-codes corresponding to the digital input code.
The set of K sub-codes can have one of at least N different sub-code orders that specify an order of each of the K sub-codes with respect to one another, where N>2.
A sum of the K sub-codes equals the digital input code.
One of the at least N different sub-code orders is selected using a shuffling algorithm.
Then, each sub-code in the set of K sub-codes is output in accordance with the selected sub-code order.
In an embodiment of the present invention, each of the K sub-codes is not different than any of the other K-1 sub-codes within the set of K sub-codes by more than one level.
According to an embodiment of the present invention, the shuffling algorithm is a dynamic element mismatch shaping algorithm.
In this embodiment, the selecting the one of the at least N different sub-code orders is performed using the dynamic element mismatch shaping algorithm.
In an embodiment of the present invention, the selecting of the one of the at least N different sub-code orders based on (1) one or more sub-code orders that were previously selected, and/or (2) a pseudo random code.
In an embodiment, each sub-code in the set of K sub-codes is provided to a respective one of K shufflers in accordance with the selected sub-code order.
Each of the K sub-codes is then separately shuffled using the respective shuffler to thereby produce K separate multi-bit shuffled density codes.
In an embodiment, each of the K shuffled density codes is then provided to a respective one of K multi-element sub-digital-to-analog converters (sub-DACs), in accordance with the selected sub-code order
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