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Parametrically Controlled Noise Shaping in Variable State-Step-Back Pseudo-Trellis SDM

Progress is reported in parametrically controlled noise shaping Sigma Delta Modulator (SDM) design. As this SDM structure (introduced by the author AES 112TH) can obtain a higher SNR than normal SDM structures, Philips Research Laboratories have questioned whether further improvement could be obtained using techniques inspired by the Trellis SDM. Simulations are used here to illustrate the performance of a parametrically controlled pseudo-Trellis SDM, which is believed to be the first disclosure of its type. The technique uses a variable state step back approach to moderate loop behaviour that is shown to achieve robust stability in the presence of aggressive noise shaping and high level signals. Comparisons are made with traditional SDM structures and LPCM systems.

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