Minimum input sensitivity of high-order multi-stage sigma–delta modulator with first-order front-end
Employing multi-stage sigma–delta modulators has provided an effective means of eliminating stability problems while achieving highresolution analog-to-digital conversion. However, component matching has become more stringent than a single-stage modulator. Mismatches cause loss in the modulators sig...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2009
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/91393 http://hdl.handle.net/10220/4626 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Employing multi-stage sigma–delta modulators has provided an effective means of eliminating stability problems while achieving highresolution analog-to-digital conversion. However, component matching has become more stringent than a single-stage modulator. Mismatches cause loss in the modulators signal-to-noise ratio (SNR), but to a certain class of multi- stage modulators, discontinuity is also apparent in its SNR characteristics.
This class of modulators employs a first-order modulator in its first stage. The discontinuity is caused by the nonlinearity of a first-order modulator’s noise, which is related to the minimum input requirement for
the first-order modulator. This brief includes the formulation of the firstorder
modulator’s minimum amplitude, nonlinear characteristics, and its effect on multi-stage modulators. |
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