Modulators – Phase shift keying modulator or quadrature amplitude modulator
Reexamination Certificate
2007-05-29
2007-05-29
Mis, David (Department: 2817)
Modulators
Phase shift keying modulator or quadrature amplitude modulator
C331S016000
Reexamination Certificate
active
10531050
ABSTRACT:
The invention concerns a wideband modulator using a PLL synthesizer, which can match the frequency characteristic and prevent degradation in modulation accuracy even in the presence of a variation in the manufacture of circuit components. In a wideband modulator which modulates the division ratio of a frequency divider by using a modulating signal generated by a modulating signal generator and outputs a modulated carrier signal from a VCO, calibration data from a calibration data generator are input via a selector. The amplitude value of an ac component of each modulating signal, either appearing on the output of a loop filter or demodulated by a demodulator, is converted to a digital value by way of an A/D converter. The difference between the two is detected and a control signal FCR to eliminate the difference is generated in order to correct the frequency characteristic of a PLL or a pre-distortion filter.
REFERENCES:
patent: 6008703 (1999-12-01), Perrott et al.
patent: 6833767 (2004-12-01), Huff et al.
patent: 6834084 (2004-12-01), Hietala
patent: 7075376 (2006-07-01), Huff et al.
patent: 2004/0041638 (2004-03-01), Vilcocq et al.
patent: 2 809 890 (2001-12-01), None
patent: 6-326518 (1994-11-01), None
patent: 9-289447 (1997-11-01), None
patent: 2001-156629 (2001-06-01), None
patent: 2002-207527 (2002-07-01), None
Perrott et al., A 27-mW CMOS Fractional -N Synthesizer Using Digital Compensation for 2.5-Mb/s GFSK Modulation, Dec. 1997, pp. 2048-2060 (Cited on ESR-English Text).
Hirano Shunsuke
Miyahara Yasunori
Matsushita Electric - Industrial Co., Ltd.
Mis David
Pearne & Gordon LLP
LandOfFree
Modulator and correction method thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modulator and correction method thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulator and correction method thereof will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3749862