IMEKO TC1 has started a series of On Line (virtual) Workshops and a Portal for joint use of educational material. The aim of this activity is to help educators in organizing good co-operation and getting benefit of synergy in their work. The educators’ work includes classroom teaching and supervising of students, but also developing and collecting educational material, and preparing textbooks, lecture notes, exercise collections, demonstrations, etc. for educational use. Transferring new scientific results into a new form suitable for education is not a minor duty. The paper presents experience from the first Workshop and discusses needs, difficulties and methods in development of networking.

Full characterization of ADC requires both a histogram-based approach and a spectral analysis to determine respectively static and dynamic parameters. This paper investigates whether static performances can be extracted from spectral analysis, in order to develop a low-cost test procedure. Results show that under appropriate test conditions, the dynamic parameters extracted from a classical FFT exhibit significant variations against ADC offset and gain errors.

Traditionally, static linearity and dynamic distortion tests are performed separately for ADCs. To this end, a low-frequency sinewave is histogrammed to measure static Integral Nonlinearity, and a high-frequency sine-wave is sampled for FFT processing to measure dynamic distortions and dynamic range.
We propose to use a model-based technique to extract both static and dynamic nonlinearities from a single data record of a sampled high-frequency sine-wave. This saves test time as the ADC converts fewer samples.

A computationally efficient adaptive filtering scheme for oversampled A/D converters is discussed. The decimating digital filter is constructed as a combination of a sinc decimator and an adaptive predictor. A reduced-rank adaptive algorithm with two adaptive parameters is proposed for this purpose avoiding the complexity of the commonly used full-rank algorithms. The characteristics of the adaptive filter are considered, and a comparative example of data signal processing is shown.

Design of high-resolution Nyquist rate A/D converter necessitates the usage of advanced circuit techniques to compensate for arising analog errors. In switched capacitor ADC, besides the well know techniques such as bottom plate sampling, mismatch-independent and redundant (RSD: 1.5 bit/stage) conversion for the elimination of charge injection, capacitor mismatch, comparator and offset sensitivity, respectively, the most utilised circuit techniques are those for OpAmp’s offset and finite gain errors cancellation. An alternative technique for compensation of the errors due to finite gain and offset of Opamp in SC circuits is proposed. This novel method features a charge addition and is compared to so far used approaches based on voltage addition. The concept and the results of a 5 V CMOS implementation of cyclic RSD ADC with ratio-independent SC technique using this correction method are discussed.