Method and apparatus for adaptive transmit power control

摘要

Systems and methods for dynamically adjusting transmit gain in a transceiver. The gain is adjusted in order to provide the maximum gain. The amount of distortion is measured. The gain is increased until the distortion reaches a predetermined limit. The gain of several components can be adjusted independently.

主权项

1. A transceiver comprising:
a variable gain power amplifier (PA), the PA configured to receive a signal to be transmitted, and provide gain to the signal to be transmitted; a loop-back circuit comprising:
a first terminal and a second terminal, the first terminal coupled to an output of the PA;a first resistor having a first and second terminal, the first terminal of the first resistor coupled to the output of the PA;a loop-back switch having a first and second terminal, the second terminal of the first resistor coupled the first terminal of the loop-back switch; anda second resistor having a first and second terminal, the first terminal of the second resistor coupled to the second terminal of the loop-back switch and the second terminal of the second resistor coupled to an input to a low noise amplifier (LNA); and a control and measurement module that is:
coupled to the PA and to an output of the loop-back circuit; andconfigured to:
provide the signal to be transmitted to the PA;measure whether distortion to the signal coupled from the output of the loop-back circuit is above an acceptable limit;if the amount of distortion is below the acceptable limit, provide a signal to the PA to increase the gain provided by the PA; andif the amount of distortion is above the acceptable limit, reduce the gain provided by the PA.