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Advances in Trellis Based SDM Structures

Recently, a new type of 1-bit Sigma Delta Modulator (SDM), called Trellis Noise-Shaping Converter, has been introduced. It offers several advantages compared to a standard SDM, including better performance in stability, signal to noise ratio (SNR) and linearity. The major drawback of the Trellis architecture is the large computational requirement. This paper refines the concept of Trellis noise-shaping, and introduces a new algorithm that offers better performance at horrendously reduced cost. On this new algorithm, a comparative performance analysis has been performed. Cost savings of multiple orders of magnitude have been achieved, while maintaining all the benefits of Trellis noise-shaping. Finally, special attention has been paid on critical implementation details.

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