Analog-to-digital converters (ADCs) for high sampling frequencies have parallel-type architectures, where the output of the comparators is the so-called “thermometer code”. The digital part of such ADCs can be just an encoder from the thermometer code to binary code; however, different types of error correction can be implemented to enhance the ADC overall performance. In this paper we compare three different types of encoders: without error correction; with 1st order error correction; with nth order error correction. These encoders are compared with respect to the yield of the ADC with the different encoders, assuming the use of an identical analog part. The yield is defined by four different criteria: monotonicity, absence of missing codes, and either integral or differential nonlinearity below a specified value.

During the last decades, a variety of so-called Rotational Single Sheet Testers (RSSTs) have been developed for multi-parametric investigations of laminated soft magnetic materials (e.g., silicon iron sheets or amorphous ribbons) under two-dimensional magnetization. The present paper reviews (i) the practical relevance of rotational magnetization (RM), (ii) designs of RSSTs for the simulation of RM, (iii) the establishment of multi-directional permeability data, (iv) the corresponding power losses, and (v) the measurement of multi-directional magnetostriction.

Several theoretical and practical difficulties affect the analytical evaluation of uncertainty of measurements dealing with complex variables. Computerintensive methods based on bootstrap and Monte Carlo techniques are here employed to investigate the uncertainty evaluation of a basic measurement procedure, the calibration of an impedance standard with the substitution method, using an RLC automatic bridge as a comparator. A procedure giving confidence intervals for the impedance parameter is shown in principle; results of calculations made with an implementation on actual measurement data are shown.

This paper, presents an innovative study of the uncertainty in the ADC transition voltages, determined by the Histogram Method for ADC testing. The new approach used, allows for a global and uniform overview of this subject, improving the existing knowledge about the workings of the Histogram Method.

The paper deals with the LTI/LTV power system models and their experimental verification. The frequency dependent system impedance is used for power system harmonics studies. As a voltage/current power system transfer function it explains well harmonics related phenomena observable in real systems. With very accurate impedance measurements power system nonlinearity can be observed. The nonlinearity manifest as system time-variance for which LTV (linear time varying) model can be used. New model improves power system description. The problems of such the model identification and verification are discussed in the paper.