Exact design of continuous-time sigma-delta modulators with multiple feedback DACs

被引：0
|
作者：
Belotti, Oscar [1 ]
Bonizzoni, Edoardo [1 ]
Maloberti, Franco [1 ]
机构：
[1] Univ Pavia, Dept Ind & Informat Engn, I-27100 Pavia, Italy
来源：
ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING | 2012年 / 73卷 / 01期
关键词：
Analog to digital conversion; Sigma delta modulation; Continuous-time systems; Sampled data systems;
D O I：
10.1007/s10470-012-9866-z
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
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.
引用
收藏
页码：255 / 264
页数：10
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