A Fully Dynamic 1st-Order $\Delta-\Delta\sum$ Modulator with a $\text{468mV}_{\mathrm{p}\mathrm{p}}$ Input Range for Electrical Impedance Tomography Systems

This paper presents an imaging IC with readout front-ends (RFEs) based on a 1^st-order $\Delta-\Delta\Sigma$ modulator $(\Delta-\Delta\Sigma \mathrm{M})$ for electrical-impedance-tomography (EIT) systems. This allows the utilization of the readout data from all the electrodes, including even the current - inj ecting electrodes, without saturation, thus achieving much higher imaging contrast. The proposed EIT system achieves an input range of 468 $\text{mV}_{\mathrm{p}\mathrm{p}}$, corresponding to 1.56 $\mathrm{k}\Omega$ when using a maximum current of 150 $\mu \mathrm{A}_{\mathrm{p}\mathrm{k}}$