Hybrid integrators with predictive overload estimation for analog computers and continuous-time ΔΣ modulators
<p>Continuous-time integrators are a central component in <span class="inline-formula">ΔΣ</span> modulators, in analog computers, and general analog signal processing. If several integrators are interconnected, scaling plays an important role: In analog computers, scaling...
| Main Authors: | , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Copernicus Publications
2023-12-01
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| Series: | Advances in Radio Science |
| Online Access: | https://ars.copernicus.org/articles/21/89/2023/ars-21-89-2023.pdf |
| Summary: | <p>Continuous-time integrators are a central component in <span class="inline-formula">ΔΣ</span> modulators, in analog computers, and general analog signal processing. If several integrators are interconnected, scaling plays an important role: In analog computers, scaling is performed with respect to the machine unit (MU). In <span class="inline-formula">ΔΣ</span> modulators, scaling is performed in such a way that at maximum input signal the allowable dynamic range of no integrator is exceeded. In both cases the scaling is a compromise limiting the dynamic range.</p>
<p>For analog computers, it was proposed early on to extend the dynamic range by hybrid integrators. Here, an analog range overflow is processed digitally and the analog integrator is reduced to its permissible operating range within the machine unit interval. While in earlier proposals for hybrid integrators only the subsequent integrator stage processes the overflow and works with reduced analog values, our hybrid integrator can process the overflow directly, with the analog reset process being continuous-time.</p>
<p>In the case of highly dynamical input signals and transients, analog overload handling is further improved by a prediction of the overload that includes the currently applied input signal in the calculation. For example, with continuous-time <span class="inline-formula">ΔΣ</span> modulators, overload of the analog integrator can be reliably avoided.</p> |
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| ISSN: | 1684-9965 1684-9973 |