Method and device for compensating temperature-dependent characteristic changes in ion-sensitive FET transducer
US4641249A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1984 |
| Grant date | Feb 3, 1987 |
| Priority date | — |
| Expiry date | Jun 19, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4148
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ion activity monitoring device is disclosed, having a semi-conductor device including an ion-sensitive field-effect transistor, for detecting the activity of ions in a liquid medium of interest, and a temperature sensor, for detecting the temperature of the liquid medium of interest, a constant current circuit for supplying a drain current of a particular value to the transistor, and a processing circuit for calculating the concentration of the ions in the liquid medium of interest. The drain current is of a value satisfying the relationship of .vertline.Id/.beta..vertline..ltoreq.0.10 volt.sup.2, wherein Id represents the drain current and .beta. represents the channel characteristic value of the ion-sensitive field-effect transistor. A method for operating the transistor is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.