Electronic device with a distortion correction circuit for a...

Details Electronic device with a distortion correction circuit for a... Electronic device with a distortion correction circuit for a...

2011-06-28

2011-06-28

Pham, Tuan A (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C455S073000, C455S076000, C455S091000, C375S296000, C375S297000

Reexamination Certificate

active

07970360

ABSTRACT:
An electronic device includes a radio frequency (RF) modulator, a power amplifier, and a distortion correction circuit coupled between the RF modulator and the power amplifier. The distortion correction circuit includes a variable gain amplifier coupled between the RF modulator and the power amplifier, and an amplitude correction control loop. The amplitude correction control loop includes a first logarithmic converter having an input coupled to the RF modulator, a second logarithmic converter having an input coupled to an output of the power amplifier, and a difference circuit coupled to outputs of the first and second logarithmic converters for controlling the gain of the variable gain amplifier for correcting distortion in an output signal from the power amplifier.

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