Exact design of continuous-time sigma-delta modulators with multiple feedback DACs |
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Authors: | Oscar Belotti Edoardo Bonizzoni Franco Maloberti |
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Affiliation: | 1. Department of Industrial and Information Engineering, University of Pavia, Via Ferrata, 1, 27100, Pavia, Italy
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Abstract: | A technique for the exact design of the noise transfer function of Continuous-Time (CT) Sigma-Delta modulators with arbitrary and multiple DAC responses and real op-amps is here presented. The approach, that presupposes linear behavior of active blocks, produces a CT modulator with the same noise shaping as its Discrete-Time counterpart. The method operates entirely in the time domain and accounts for non-idealities of real implementations such as finite gain and bandwidth of integrators. The procedure can be effectively implemented with circuit simulators to allow the exact design with transistor level blocks. A design example on a third-order scheme confirms the effectiveness of the method. |
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