Modulators – Phase shift keying modulator or quadrature amplitude modulator
Reexamination Certificate
2011-03-01
2011-03-01
Kinkead, Arnold (Department: 2817)
Modulators
Phase shift keying modulator or quadrature amplitude modulator
C332S109000, C332S112000, C375S213000, C375S261000, C375S264000, C375S271000, C330S010000, C330S136000
Reexamination Certificate
active
07898352
ABSTRACT:
The present invention relates in general to transferring the envelope information of a polar modulated signal to a varying pulsewidth signal, while the phase modulation is direct transferred to the phase modulation of this PWM signal. Accordingly, the resultant signal is a PWM-PPM-signal. Such a signal can efficiently amplified by use of switching amplifying stages. By the present invention four pre-distorted baseband signals are applied basically to 4 linear RF mixers and a two adders, which are, the only needed external RF building blocks to build the modulator according to the invention. That is, the basic idea of the invention resides in the way of modulation of the four baseband signals and the way of combining of the RF modulated signals.
REFERENCES:
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patent: 7358829 (2008-04-01), Oka
patent: 1271870 (2003-01-01), None
Cox D C; “Linear Amplification with Nonlinear Components”. IEEE Transactions and Communications, COM-22, pp. 1942 to 1945, Dec. 1974. Piscataway, NJ, USA.
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Andraka R; “Survey of Cordic Algorithms for FPGA Based Computers”. ACM SIGDA International Symposium on Field Programmable Gate Arrays. FPGA '98. Monterey, CA, Feb. 22-24, 1998. vol. 6th Conf., pp. 191-200. ACM, New York, NY, US.
De Jong Gerben W.
Sanduleanu Mihai A. T.
Vromans Jan
Kinkead Arnold
NXP B.V.
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