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. 31, 2011
Filed:
Aug. 03, 2007
Yutaka Harada, Tokyo, JP;
Ichiro Mitsutake, Tokyo, JP;
Kouji Okuda, Tokyo, JP;
Taka Inoue, Tokyo, JP;
Tetsuya Kajita, Tokyo, JP;
Yutaka Harada, Tokyo, JP;
Ichiro Mitsutake, Tokyo, JP;
Kouji Okuda, Tokyo, JP;
Taka Inoue, Tokyo, JP;
Tetsuya Kajita, Tokyo, JP;
Yamatake Corp., Tokyo, JP;
Abstract
In a constant current circuit, a constant current is caused to flow through a resistor, thereby causing a constant voltage to occur across the resistor. This constant voltage is then superimposed on an output signal of an operational amplifier that is to be fed back to the drain of a field effect transistor, thereby maintaining the same potential in an AC manner between the output terminal of the operational amplifier and the drain of the field effect transistor. In this way, the gate and drain of the field effect transistor is caused to exhibit the same potential in an AC manner, so that no current will occur through the stray capacitance between the gate and drain of the field effect transistor. As a result, similarly to a case of using a feedback capacitor, the input impedance of the field effect transistor can be raised.