Environmental Engineering Reference
In-Depth Information
The result is shown in Fig.9.10. The frequency of the input is 1kHz and
a 4kHz bandwidth was assumed in SNR calculation.
Summary
8.
In this chapter, we have first reviewed the characteristics of over-
sampled sigma-delta modulators and the difficulties encountered in anal-
ysis of these special circuits. We have shown that the difficulties encoun-
tered in modeling quantizers at the circuit level can be overcome using
behavior modeling. Other blocks of sigma-delta modulators, however,
can be dealt with conveniently using conventional circuit-level formu-
lation techniques. The simulation methods that incorporate both the
behavioral modeling of the quantizers and the sampled-data simulation
for linear circuits have been detailed. A continuous-time over-sampled
sigma-delta modulators and its switched capacitor counterpart have been
analyzed and comparable results have been obtained.
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