News
Update 12.12.2024
Adapted downloadable Matlab file: supports the use of optimized modulators in the Matlab Schreier DS Toolbox
Update 15.07.2024
Added new reconstruction filters for I-DS ADCs
Bugfixes
Update 22.07.2023
Added inner transfer functions support for lowpass DS/I-DS ADCs
Added noise suppression factors support for lowpass DS/I-DS ADCs
Bugfixes
Update 25.04.2022
Added FIR DAC support for CT SD/I-SD ADCs
Bugfixes
Update 15.01.2021
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Hardware upgrade
The server is upgraded to up-to-date hardware providing faster optimizations while the feature set is increased. -
Support for DT incremental ΣΔ ADCs
The already available support for DT incremental ΣΔ ADCs is extended. Multiple reconstruction filters are now supported: a CoI filter, a matched filter reassembling the loopfilter, a sinc filter and the Zoomer algorithm, providing optimal algorithmic reconstruction. -
Support for CT incremental ΣΔ ADCs
The support for CT incremental ΣΔ ADCs is now stabilized and available in the main version of the environment with the same reconstruction filters as for the DT counterpart. Bugfixes
Update 18.11.2019
- Added development version for CT incremental ΣΔ ADCs
- Bugfixes
Update 25.06.2019
- Bugfixes
Update 06.07.2018
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Initial support for DT incremental ΣΔ modulators
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Support for DT lowpass ΣΔ modulators
The tool provides now support for DT lowpass ΣΔ modulators. It supports the same feature set as the CT implementation.
Update 14.02.2018
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New resonator and integrator models
New modulator models are included in the tool. Dedicated resonator models are added, including an ideal resonator, a gm-LC resonator and an OpAmp-LC resonator. The latter ones account for finite bandwidth and finite Q. Alongside the already existing integrator models, a gm-C integrator is added.
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Supsampling support in bandpass modulators
The tool now supports center frequencies \(f_\mathrm{c}\ \in [0;2]\) normalized to \(f_\mathrm{s}\). In the initial implementation for bandpass modulators, the tools only supported frequencies in the first Nyquist zone. This limitation is now removed.
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Load and store current modulator to file
Modulators can now be saved to file and loaded from it again. This allows to store designs for later usage and also share them.
Update 14.02.2018
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New website Layout online
The design of the www.sigma-delta.de is updated. It is inspired by the updated design of the website of the University of Ulm. An updated news section gives more insight to changes in the tool.
Update 07.02.2017
- Bugfixes
- Basic Matlab export
Update 21.11.2016
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Initial support for CT bandpass ΣΔ modulators
The tool has basic support for CT bandpass ΣΔ modulators. It can account for STFs in the same way as in lowpass modulators.
Related publication: Designing CT Bandpass Sigma-Delta Modulators with Arbitrary STF Shapes
Update 07.03.2016
- Negative coefficients possible
- Bugfixes for STF calculation
Update 08.10.2015
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Multiple DACs with individual waveforms
The model of one single feedback DAC that distributes its signal via individual gains to the integrators is replaced. Each feedback path features now a respective DAC with its own parameter set including a waveform and a local delay.
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More ELD compensation techniques
The tool now supports new ELD compensation techniques. Compensation via capacitive coupling and a semi-digital differentiator is now possible.
Related publication: Using www.sigma-delta.de to Rapidly Obtain ELD Compensated CT ΣΔ Modulators
- Bugfixes and interface improvements