János Márkus

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Analog–Digital (A/D) converters used in instrumentation and measurements often require high absolute accuracy, including very high linearity and negligible dc offset. The realization of high-resolution Nyquist-rate converters becomes very expensive when the resolution exceeds 16 bits. The conventional delta–sigma ( ) structures used in telecommunication and(More)
This paper describes a low-power 22-bit incremental ADC, including an on-chip digital filter and a low-noise/low-drift oscillator, realized in a 0.6m CMOS process. It incorporates a novel offset-cancellation scheme based on fractal sequences, a novel high-accuracy gain control circuit, and a novel reduced-complexity realization for the on-chip sinc filter.(More)
Contamination of soil with lead has occurred on a global scale. Exposure to lead may cause adverse effects to human health and the environment. It is therefore desirable to obtain a quantitative estimate of the potential risk of lead contamination. Numerous studies have been conducted collecting lead concentration data from both natural and contaminated(More)
As the demand for (Delta-Sigma) analog-to-digital converters (ADCs) with higher bandwidth and higher signal-to-noise ratio (SNR) increases, designers have to look for efficient structures with low oversampling ratio (OSR). The Leslie-Singh or –0 MASH architecture is often used in such applications. Based on this architecture, a reduced-sample-rate structure(More)
In this paper the theoretical operation of incremental (charge-balancing) delta-sigma (DeltaSigma) converters is reviewed, and the implementation of a 22-bit incremental A/D converter is described. Two different analyses of the first-order incremental converter are presented, and based on these results two extensions to higher-order modulators are proposed.(More)
Small improvements to the iteration procedure of the IEEE Standard 1241-2001 are suggested, and extension of the standard MATLAB program implementing the sine wave test is discussed. The program is compatible with the LabView program already announced, and in other working modes offers extensions, too.
Small improvements to the iteration procedure of the IEEE Standard 1241-2001 are suggested, and extension of the standard MATLAB program implementing the sine wave test is discussed. The program is compatible with the LabView program already announced, and in other working modes offers extensions, too.
The paper describes a digital time-domain additive synthesis technique and its application to the synthesis of the sound of organ pipes. The model is based on the Fourier-expansion of the periodic signals. This periodic signal generator is completed with filters and noise-generator implementing the instrument-specific parameters. The novelty of the proposed(More)