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A sigma-delta modulator which can improve the linearity of input original signal is proposed in this paper. The inverting and double sampling techniques are used in proposed modulator to convert the single-ended signal to fully differential signal. Therefore, the signal's linearity could be modified by the suppression of the even mode harmonic in fully differential circuit. With the proposed technique,...
A novel biomedical acquisition system which can adjust its resolution by the condition of signal is presented in this paper. The resolution of sigma-delta modulator in proposed system can be automatically varied by switching its architecture and sampling rate that can acquire accurate date without additional power consumption. The modulator in this system reaches specifications from 10-bit to 16-bit...
A low-cost thermal sensor with sigma-delta ADC was realized in 0.25mum CMOS process. Simplify the circuitry with different technologies to improve the efficiency and reduce the error in the thermal sensor chip. Substrate npn transistors are used to sense the temperature and generate the ADC's reference voltage. The ingenious application of sigma-delta ADCs can reduce the complexity of circuit, thereby...
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