CNT 센서 응용을 위한 전류모드 연속시간 ΔΣ 모듈레이터

We propose a current-mode continuous-time ΔΣ modulator for carbon nanotube(CNT) sensor application. The presented modulator is converted from the conventional voltage-mode ΔΣ modulator without performance degradation. Since the modulator receives current input, it is suitable for the detection of resistive sensors. The ΔΣ modulator operates at 20.48 ㎒ sampling frequency and achieves 104.92 ㏈ SNR over a bandwidth of 20 ㎑ with MATLAB Simulink.