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:
Sep. 14, 2021
Filed:
Aug. 06, 2018
Applicant:
Rohm Co., Ltd., Kyoto, JP;
Inventors:
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/08 (2006.01); H03F 3/45 (2006.01); H03F 3/19 (2006.01); B60R 16/02 (2006.01);
U.S. Cl.
CPC ...
H03F 3/4508 (2013.01); H03F 1/083 (2013.01); H03F 3/19 (2013.01); H03F 3/45179 (2013.01); B60R 16/02 (2013.01); H03F 2200/129 (2013.01); H03F 2200/372 (2013.01); H03F 2200/451 (2013.01); H03F 2203/45116 (2013.01); H03F 2203/45594 (2013.01);
Abstract
An operational amplifiercomprises transistors Qand Qforming an input stage, and input resistors Rand Rwhich form a filter together with parasitic capacitors Cand Caccompanying the transistors Qand Q. Resistance values R of the resistors Rand Rmay be set to R=1/(2π·fc·C), where C is the capacitance value of each of the parasitic capacitors Cand C, and fc is the target cutoff frequency of the filter. The operational amplifiermay also include a power supply resistor Rwhich forms a filter together with a parasitic capacitor Caccompanying a power supply line.