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. 30, 2006
Filed:
Oct. 24, 2000
Kenji Itoh, Hyogo, JP;
Hiroaki Nagano, Hyogo, JP;
Takatoshi Katsura, Hyogo, JP;
Shinjirou Fukuyama, Hyogo, JP;
Mitsuru Mochizuki, Hyogo, JP;
Yoshinori Matsunami, Hyogo, JP;
Mitsuhiro Shimozawa, Hyogo, JP;
Fumio Ishizu, Hyogo, JP;
Ryoji Hayashi, Hyogo, JP;
Kenji Itoh, Hyogo, JP;
Hiroaki Nagano, Hyogo, JP;
Takatoshi Katsura, Hyogo, JP;
Shinjirou Fukuyama, Hyogo, JP;
Mitsuru Mochizuki, Hyogo, JP;
Yoshinori Matsunami, Hyogo, JP;
Mitsuhiro Shimozawa, Hyogo, JP;
Fumio Ishizu, Hyogo, JP;
Ryoji Hayashi, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a cellular telephone provided with a receiving circuit of a direct conversion type, a passive low-pass filter is arranged between a mixer for an I-channel and a base band circuit for removing interference waves of or above a channel next to a channel neighboring to the I-channel, and another passive low-pass filter is arranged between a mixer for a Q-channel and the base band circuit for removing interference waves of or above a channel next to a channel neighboring to the Q-channel. Since the low-pass filters for removing the interference waves of or above the channel next to the neighboring channel are of a differential type, the circuit scale can be small, and the power consumption is small. Since the interference waves are removed by the passive low-pass filters and the active low-pass filters, only the desired channel can be reliably received.