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. 30, 2004
Filed:
Mar. 12, 2003
Shiro Dosho, Osaka, JP;
Takashi Morie, Osaka, JP;
Hitoshi Kobayashi, Osaka, JP;
Norihide Kinugasa, Kyoto, JP;
Masaomi Toyama, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a front end that has a filter circuit and is used for a communication system having an asymmetric communication channel in which upstream and downstream data rates are different, a filter circuit for received signals, which is for filtering received signals, and a filter circuit for transmitted signals, which is for filtering transmitted signals, are provided. The filter circuit for received signals has an amplifier block including a plurality of amplifiers, a capacitor block including a plurality of capacitors and being connected to the plurality of amplifiers included in the amplifier block, and a first and a second resistor blocks each including a plurality of resistors. Either one of the first or the second resistor block is selectively switched so as to be connected to the amplifier block by a resistor block-switching circuit. The circuit scale is reduced since only one amplifier block and one capacitor block are commonly used for two kinds of filter circuits.