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:
Jun. 12, 2001
Filed:
Feb. 15, 2000
Masahisa Nemoto, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
There is disclosed a negative feedback amplifier provided with a feedback circuit used to make impedance variable and to improve high frequency characteristics and so configured to prevent a problem of parasitic capacity caused by a by-pass condenser. The feedback circuit connected in parallel to an inverting amplifier circuit is composed of a first feedback resistor connected in parallel to the inverting amplifier circuit, and a second feedback resistor and the by-pass condenser, both being connected in parallel to the first feedback resistor, and both ends of the by-pass condenser, together with the second feedback resistor, can be connected to the inverting amplifier circuit via first and second switching devices.