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:
Aug. 08, 2006
Filed:
Sep. 06, 2002
Masami Yakabe, Tokyo, JP;
Masami Yakabe, Tokyo, JP;
Tokyo Electron Limited, Tokyo, JP;
Abstract
A capacitor C and an impedance converter Hiz are included in a feedback circuit of the first operational amplifier OPin series; an electrode Pof a capacitive sensor is connected to a connection point of the said capacitor and the converter via a signal line L. The signal line L is connected to a predetermined standard electric potential through resistance Rwhose resistance value is high. When the capacitor is included in the feedback circuit, the signal line becomes in a state of floating and a circuit operation becomes unstable, however, the signal line L is fixed at predetermined electric potential, and therefore, the operation becomes stable. It is acceptable to configure the impedance converter with a voltage follower and connect the resistance Rto the output.