Electronic circuit for ion sensor

Details Electronic circuit for ion sensor Electronic circuit for ion sensor

2005-06-14

2005-06-14

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Using ionization effects

For analysis of gas, vapor, or particles of matter

C205S789000

Reexamination Certificate

active

06906524

ABSTRACT:
An ion sening circuit comprises a bridge sensing circuit and a differential amplifying circuit. The bridge sensing circuit detects the ion concentration of the solution in the operation mode of constant voltage and constant current. The differential amplifying circuit compares the output of the bridge sensing circuit and a floating reference voltage, thereby the delivered voltage to the bridge sensing circuit, such that the opeation mode of constant voltage and constant current is formed accordingly. The main features of the disclosed circuit are that it grounds the reference electrode and floats the source terminal. The drawbacks of not being manufactured with intergrated circuits by CMOS technology and low benefits when applied to sensor arrays are avoided by the disclosed circuit.

REFERENCES:
patent: 4645583 (1987-02-01), Shirai et al.
patent: 5296122 (1994-03-01), Katsube et al.
patent: 5309085 (1994-05-01), Sohn
patent: 6624637 (2003-09-01), Pechstein

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