Modulators – Phase modulator – Including amplitude modulator
Reexamination Certificate
2005-11-22
2008-09-23
Pascal, Robert J. (Department: 2817)
Modulators
Phase modulator
Including amplitude modulator
C332S106000, C332S108000, C332S128000, C455S102000, C455S108000
Reexamination Certificate
active
07427903
ABSTRACT:
A polar modulator has a low AM-AM and AM-PM distortion comprises a phase locked loop. The phase locked loop is designed for outputting a high-frequency signal with a frequency derived from a phase modulation signal at an actuating input of the phase locked loop. A filter device, for suppressing a DC signal component, is coupled to an output of the phase locked loop. Furthermore, provision is made of a controllable voltage source with a control input suitable for feeding in an amplitude modulation signal. A push-pull amplifier is connected by an input to the filter device. It comprises two feedback amplifier transistors connected in series, which are connected to a voltage output of the controllable voltage source for supply purposes. Control terminals of the amplifier transistors are connected to the input and, via a load, to an output of the push-pull amplifier.
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“Techniques for High Data Rate Modulation and Low Power Operation of Functional-N Frequency Synthesizers”, Michael Henderson Perrot, Thesis Doctor of Philosophy in Electrical Engineering and Computer Science, Sep. 1997, Massachusetts Institute of Technology, 13 pgs.
“RF Microelectronics”, Behzad Razavi, Prentice Hall Communications Engineering and Emerging Technologies Series, Chap. 3.3.3, 12 pgs.
Gannon Levi
Pascal Robert J.
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