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A Delta-Sigma Modulator with Non-Delay Integrator for Capacitance Detection

YAN Bo,ZENG Wei,GAO FengNational Microanalysis Center,Fudan University,Shanghai 200433,China  
This paper introduces a Delta-Sigma modulator with non-delay integrator for capacitance detection,which reduces the leak charge by integrating and sampling simultaneously instead of taking them separately in most occasions.This structure can greatly improve the performance of Delta-Sigma modulator using in small capacitance detection.The end of this paper shows the simulation results of a 2nd order modulation which achieve a great increase ability in detecting SNR(Signal to Noise Ratio)for ultra small capacitance and a larger dynamic range in application.
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