The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 2008
Filed:
Jun. 12, 2006
Wen-yaw Chung, Taoyuan Hsien, TW;
Chung-huang Yang, Jinning Township, Kinmen County, TW;
Dorota Genowefa Pijanowska, Nieporet, PL;
Piotr Grabiec, Osowiec, PL;
Bohdan Jaroszewicz, Warsaw, PL;
Wladyslaw Torbicz, Warsaw, PL;
Wen-Yaw Chung, Taoyuan Hsien, TW;
Chung-Huang Yang, Jinning Township, Kinmen County, TW;
Dorota Genowefa Pijanowska, Nieporet, PL;
Piotr Grabiec, Osowiec, PL;
Bohdan Jaroszewicz, Warsaw, PL;
Wladyslaw Torbicz, Warsaw, PL;
Chung Yuan Christian University, Chung Li, TW;
Abstract
An electronic circuit for ion sensor with the body effect reduction includes a bridge-type floating source circuit provided with an input terminal, an output terminal reflecting the change in the potential dependent on ion concentration, and an ion-sensitive field effect transistor (ISFET) wherein one terminal of the ISFET is coupled with the output terminal; a current mirror for providing a current to the bridge-type circuit; a third transistor for receiving the operating current provided by the current mirror, identical to the current provided to the ISFET; a differential amplifying circuit, wherein one input terminal of the amplifying circuit is input with a reference voltage, and the other input terminal is coupled with the output of the bridge-type readout circuit; and a third amplifier to generate a differential output voltage compensated for the body effect, temperature and time drift effects.