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:
Nov. 12, 1991
Filed:
Oct. 29, 1990
Kazuhisa Ishiguro, Nitta, JP;
Yasunori Sato, Oizumi, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
An amplification circuit including a differential amplifier is disclosed. An npn transistor portion of the differential amplifier has its base provided with negative feed back, the base potential is brought to a constant potential, i.e. a virtual ground potential. The voltage between the base and emitter of the transistor is thus kept constant, and the internal resistance of the emitter does not change in accordance with the change of the emitter current. As a result, since the transistor responds only to an input signal current converted by a resistor and operates, the linearity between the input and the output of the differential amplifier is improved.