Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-12-06
2005-12-06
Chin, Stephen (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S260000, C370S902000, C455S060000
Reexamination Certificate
active
06973136
ABSTRACT:
A phase comparator (106) compares a phase of the output signal of the quadrature modulator (104) with the phase of the signal obtained by frequency-converting the output signal of a first VCO (101) via the second VCO (102) and the first mixer (108). A PLL modulator includes a low-pass filter (107) filters a component below a predetermined frequency of the output signal of the phase comparator (106) and supplying the resulting signal to the frequency control terminal of the first VCO (101). The output signal (TS1) of the first VCO (101) is a modulated signal conforming to a modulation system having a constant envelope waveform, while the output signal of the quadrature modulator (104) is input to the first band-pass filter (110) and the output signal (TS2) of the first band-pass filter is a modulated signal conforming to a modulation system accompanied by an amplitude component as information.
REFERENCES:
patent: 6438358 (2002-08-01), Higuchi
patent: 6766178 (2004-07-01), Damgaard et al.
patent: WO 99/56442 (1999-11-01), None
Patent Abstracts of Japan, Kato Hisakazu, “Modulator”, Publication No. 07321857, Publication Date: Dec. 8, 1995, 1 page.
Taizo Yamawaki, Masaru Kokubo, Koyoshi Irie, Hiroaki Matsui, Kazuaki HOri, Takefumi Endou, Hiroshi Hagisawa, Tomio Furuya, Yoshimi Shimizu, Makoto Katagishi and Julian Robert Hildersley, “A 2.7-V GSM RF Transceiver IC”, XP-000767457, Dec. 1997, pp. 2089-2096.
Akaoka Yasunobu
Kojima Noriharu
Takada Jun-ichi
Watanabe Hideki
Chin Stephen
File Erin M
Matsushita Electric - Industrial Co., Ltd.
Pearne & Gordon LLP
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