Method and system for reducing AM/PM distortion in a polar...

Details Method and system for reducing AM/PM distortion in a polar... Method and system for reducing AM/PM distortion in a polar...

2011-06-07

2011-06-07

Trinh, Sonny (Department: 2618)

Telecommunications

Transmitter

Plural modulation

C455S115100, C455S127100, C330S010000

Reexamination Certificate

active

07957704

ABSTRACT:
Methods and systems for reducing AM/PM distortion in a polar amplifier are disclosed and may comprise adding an offset signal to an amplitude signal in the digital domain and removing the offset signal in the analog domain during polar modulation. A sum of an amplitude signal and an offset signal may be mixed with a phase signal in a first differential amplifier to generate a first voltage signal, and the offset signal may be mixed with the phase signal in a second differential amplifier to generate a second voltage signal, which may be subtracted from the first voltage signal. The amplitude and offset signals may be mixed with the phase signal by modulating a current in the differential amplifiers, which may comprise cascode differential amplifiers. The modulated current may be generated using a current source and a current mirror circuit, which may comprise a cascode current mirror.

REFERENCES:
patent: 6771720 (2004-08-01), Yang et al.
patent: 7058371 (2006-06-01), Li et al.
patent: 7243037 (2007-07-01), Tracht et al.
patent: 7289005 (2007-10-01), Puma
patent: 7414470 (2008-08-01), Okazaki
patent: 7469130 (2008-12-01), Mayer et al.
patent: 7596184 (2009-09-01), Ahmed
patent: 2003/0215025 (2003-11-01), Hietala
patent: 2007/0120617 (2007-05-01), Sato et al.

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