Two important techniques on 24 bit data acquisition system which applies ∑-△ 24 bit A/D converter and CPLD programmable techniques are expatiated.

Adjusting the calibration coefficients of the high performance Σ-ΔA/D converter of AD7710 family;

Chaotic A/D converter based on Bernoulli mapping and CPLD;

Application and principle of MAX1415/1416 A/D converter;

CS5522 analog-to-digital converter and its application in survey of small angle;

A novel single-electron analog-to-digital converter;

By means of both the Hilbert-Huang transform(HHT) and the traversal method,under the circumstances of 7-bit signal source,and with both the harmonic distortion and the noise distortion existing,parameters of fitting sinusoid are obtained from the analog-to-digital converter(ADC) output data,and then the effective number of bits(ENOBs) of 14-bit ADC are tested accurately.