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# News

## Update 15.01.2021

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

• Bugfixes

## Update 06.07.2018

• ### 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

• ### 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.

• ### 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.

• ### 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

• ### 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 07.03.2016

• Negative coefficients possible
• Bugfixes for STF calculation

## Update 08.10.2015

• ### 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.

• ### 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