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US 2010/0136937 A1Published application
Polar Feedback Receiver for Modulator
AssigneeInfineon Technologies AG
InventorsNick Shute, Andrei Panioukov, Zdravko Boos
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Abstract
This disclosure relates to linearization in polar modulators of wireless communication devices, to attain linear amplification and high power efficiency during transmission.
Claims20
A modulator comprising:
- a baseband component configured to receive data signals and produce a baseband signal from the data signals;
- and
- a radio frequency (RF) component to perform modulation of the baseband signal to produce a modulated RF signal, the RF component comprised of:
- a feedback receiver to extract the baseband signal for linear amplification.
1 more element
A feedback receiver comprising:
- an inverse baseband magnitude component to reverse a compensated magnitude signal to an inverse compensated magnitude signal;
- a digital to analog converter to convert the inverse compensated magnitude signal to an analog inverse compensated magnitude signal;
- a mixer component operating in a variable gain stage that combines the analog inverse compensated magnitude signal with a modulated radio frequency (RF) signal to generate a limited modulated RF signal;
- a phase discriminator configured to extract a phase signal plus distortion from the limited modulated RF signal;
- and
- a mixer component configured to extract a magnitude signal plus distortion from the limited modulated RF signal.
3 more elements
A method of implementing a feedback receiver for linearization of a modulator comprising:
- inverting a magnitude of a baseband signal to an inverse magnitude of the baseband signal;
- converting the inverse magnitude of the baseband signal into analog form;
- removing an amplitude modulation content of a modulated RF signal by combining the analog inverse magnitude of the baseband signal with the modulated RF signal to produce a limited modulated RF signal;
- extracting a phase signal and distortion from the limited modulated RF signal;
- extracting a magnitude signal and distortion from the combination of the limited modulated RF signal and the modulated RF signal;
- and
- calculating an error signal coefficient for linearization of the modulator.
4 more elements
Dependencies are inferred from the claim text.