公开(公告)号：US20240310321A1

公开(公告)日：2024-09-19

申请号：US18575877

申请日：2022-07-01

申请人： The Research Foundation for The State University of New York

发明人： Albert TITUS ,  Vaishak PRATHAP ,  Alexander VILLALTA

IPC分类号： G01N27/414 ,  G01N27/416

CPC分类号： G01N27/4148 ,  G01N27/4167

摘要： A pHI sensor system, Integrated Circuit (IC) chip, and a method are provided. Embodiments of the pH sensor may a first p-channel ion-sensitive transistor (IST)-operational-transconductance-amplifier (PIOTA) and a second PIOTA. Each PIOTA may further include a p-channel IST, an n-channel load transistor having a source and drain, wherein each PIOTA may have a drain-to-source resistance different from each other. Each PIOTA may further include an operational-transconductance-amplifier (OTA). A differential sensor may be connected to the outputs of both PIOTAs, and an output from the differential sensor may indicate a change in pH. Each PIOTA may further have an n-type substrate, a potential of which may be varied to control sensitivity of pH change detection. The NMOS load transistors of one or both of the PIOTAs may be selected from a plurality of NMOS load transistors to enhance sensitivity.