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. 27, 2008
Filed:
Apr. 25, 2006
Shunsuke Hirano, Kanagawa, JP;
Hisashi Adachi, Osaka, JP;
Shunsuke Hirano, Kanagawa, JP;
Hisashi Adachi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
There provides a two-point modulation phase modulation apparatus capable of obtaining an RF phase modulation signal of superior modulation precision with low power consumption and a simple configuration even in the event of inputting a wide band baseband modulation signal. A differentiator () of the opposite characteristics to the attenuation characteristics of anti-alias filter () is provided at the front stage of a D/A converter (). As a result, it is possible to sufficiently suppress an alias signal without raising the sampling frequency of the D/A converter () (i.e. low power consumption) using an anti-alias filter () of a simple configuration (i.e. low cost) with a low order for a narrower bandwidth than a PLL modulation frequency bandwidth, and it is possible to obtain an RF phase modulation signal where the entire frequency band of input digital baseband modulation signal (S) is reflected in a superior manner.