Apparatus and method for low voltage radio transmission

摘要

Apparatus and methods are disclosed related to low-voltage radio transmitters with high spectral purity. One such apparatus includes a baseband path with a predistortion stage, a programmable filter, and an upconverter core. In an embodiment, the programmable filter is placed between the predistortion stage and the upconverter core. In an embodiment, the programmable filter is configured by a controller to reject out-of-band noise introduced at the predistortion stage or earlier.

主权项

1. A method of processing a signal comprising:
predistorting an analog signal to generate a predistorted signal, wherein the predistorted signal at least partially compensates for non-linearity of a transistor; filtering the predistorted signal to generate a filtered signal; and upconverting the filtered signal, wherein the transistor to be compensated is used in upconverting, wherein predistorting comprises operating a replica transistor in a feedback loop to generate a predistorted gate signal as the predistorted signal, and wherein upconverting comprises applying the filtered signal as a gate drive to a transistor that is a scaled version of the replica transistor.