A New Method for Current Differential ISFET/REFET Readout Circuit
This paper presents a new differential current mode readout circuit for ion sensitive field effect transistor (ISFET) to be used as a pH sensor. The circuit used only two MOSFETs to provide current differential pairs result in simplification and very small circuit It provides a linear sensitivity to pH over a wide range (pH 2-12) which is 25.6 uA/pH with power dissipation of 937.6 uW at 27°C. The circuit is operating in differential mode, reference field effect transistor (REFET) is provided to compensate environment conditions. Temperature compensation in a range of 22-32°C is investigated. It can be well compensated output varying. Simulation results validate the performance of the circuit.
ISFET readout circuit MOSFET differential pairs current mode small circuit
Taksin Nobpakoon Wanchai Pijitrojana Amporn Poyai
Electrical and Computer Engineering Department, Faculty of Engineering Thammasat University Pathumth Electrical and Computer Engineering Department, Faculty of Engineering Thammasat University Pathumth Thai Microelectronics Center (TMEC) National Electronics and Computer Technology Center Chachoengsao
国际会议
海口
英文
268-271
2011-02-22（万方平台首次上网日期，不代表论文的发表时间）