Effect of channel width-to-length ratio on isothermal point of MOSFET-ISFET structure

Author

Noh, Nurul Izzati Mohammad ; Yusof, Khairul Aimi ; Zolkapli, Maizatul ; Abdullah, Ali Zaini ; Abdullah, Wan Fazlida Hanim ; Herman, Sukreen Hana

Author_Institution

Fac. of Electr. Eng., Univ. Teknol. MARA (UiTM), Shah Alam, Malaysia

fYear

2013

fDate

25-27 Sept. 2013

Firstpage

130

Lastpage

133

Abstract

The effect of channel width-to-length (W/L) ratio on MOSFET-ISFET structures was investigated from simulation and experimental approach. A metal-oxide-semiconductor field-effect-transistor (MOSFET) has been adopted to investigate the isothermal point of an ion-sensitive FET (ISFET), which is needed to suit the readout interfacing circuit of an ISFET sensor. The MOSFET structure with different W/L ratio has been characterized in order to see the effect of W/L ratio to the isothermal point. The Keithley 236 Parameter Analyzer and Semi-auto prober micromanipulator system were used to measure the drain-source current (I_DS) versus gate to source voltage (V_GS) curves at various temperatures from 30 °C to 60 °C. The simulation result showed that the reduction of W/L ratio can decrease the isothermal point and this was proven by the actual measurement.

Keywords

MOSFET; ion sensitive field effect transistors; readout electronics; ISFET sensor; Keithley 236 parameter analyzer; MOSFET-ISFET structure; channel width-to-length ratio; drain-source current; gate-source voltage curves; ion-sensitive FET; isothermal point; metal-oxide-semiconductor fieldeffect-transistor; readout interfacing circuit; semiauto prober micromanipulator system; temperature 30 degC to 60 degC; Current measurement; Isothermal processes; MOSFET; MOSFET circuits; Temperature; Temperature measurement; Temperature sensors; Ion-Sensitive Field Effect (ISFET); Isothermal point; ratio of width-to-length (W/L); temperatures;

fLanguage

English

Publisher

ieee

Conference_Titel

Micro and Nanoelectronics (RSM), 2013 IEEE Regional Symposium on

Conference_Location

Langkawi

Print_ISBN

978-1-4799-1181-3

Type

conf

DOI

10.1109/RSM.2013.6706490

Filename

6706490