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:
Dec. 06, 2005
Filed:
Jun. 28, 2001
Noriharu Kojima, Yokohama, JP;
Hideki Watanabe, Koza-gun, JP;
Yasunobu Akaoka, Yokosuka, JP;
Junichi Takada, Kamakura, JP;
Noriharu Kojima, Yokohama, JP;
Hideki Watanabe, Koza-gun, JP;
Yasunobu Akaoka, Yokosuka, JP;
Junichi Takada, Kamakura, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A phase comparator () compares a phase of the output signal of the quadrature modulator () with the phase of the signal obtained by frequency-converting the output signal of a first VCO () via the second VCO () and the first mixer (). A PLL modulator includes a low-pass filter () filters a component below a predetermined frequency of the output signal of the phase comparator () and supplying the resulting signal to the frequency control terminal of the first VCO (). The output signal (TS) of the first VCO () is a modulated signal conforming to a modulation system having a constant envelope waveform, while the output signal of the quadrature modulator () is input to the first band-pass filter () and the output signal (TS) of the first band-pass filter is a modulated signal conforming to a modulation system accompanied by an amplitude component as information.