Modulators – Phase modulator – Including amplitude modulator
Reexamination Certificate
2007-10-30
2007-10-30
Kinkead, Arnold (Department: 2817)
Modulators
Phase modulator
Including amplitude modulator
C332S144000, C332S108000, C332S109000, C332S115000, C332S149000, C375S268000, C375S238000, C375S294000, C375S297000, C375S300000, C455S108000, C455S205000, C455S208000, C455S260000, C455S264000, C455S286000, C455S114100
Reexamination Certificate
active
11303175
ABSTRACT:
A polar modulator contains a phase locked loop which is designed to emit a radio-frequency signal at one frequency to one output, with the frequency being derived from the reference signal and from a phase modulation signal at a control input of the phase locked loop. The modulator additionally has a second signal input for supplying an amplitude modulation signal. The second signal input is connected to a control input of a pulse width modulator, one of whose signal inputs is coupled to the output of the phase locked loop. The pulse width modulator is designed to vary the duty ratio of a signal which is applied to the signal input, with this variation being adjustable via a regulation signal at the control input. A filter can be connected downstream from the output of the pulse width modulator and suppresses higher harmonic components in a signal which can be tapped off at the output of the pulse width modulator. The amplitude of an output signal is thus modulated by carrying out pulse width modulation and by subsequent suppression of higher-level frequency components.
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Eschweller & Associates, LLC
Infineon - Technologies AG
Kinkead Arnold
LandOfFree
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