Polar modulator and a use thereof

Details Polar modulator and a use thereof Polar modulator and a use thereof

2008-09-23

2008-09-23

Pascal, Robert J. (Department: 2817)

Modulators

Phase modulator

Including amplitude modulator

C332S106000, C332S108000, C332S128000, C455S102000, C455S108000

Reexamination Certificate

active

11284514

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.

REFERENCES:
patent: 6194963 (2001-02-01), Camp, Jr. et al.
patent: 6650875 (2003-11-01), Rozenblit et al.
patent: 6701134 (2004-03-01), Epperson
patent: 6985703 (2006-01-01), Groe et al.
patent: 2003/0134611 (2003-07-01), Park et al.
patent: 195 35 075 (1996-04-01), None
patent: 100 45 761 (2002-03-01), None
“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.

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