Patent ID: 11870396
Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A power amplifier system comprising:
a supply modulator circuit to generate a supply voltage at a supply output based at least on a valley level input;
a digital to analog converter configured to receive a digital amplitude signal and to convert the digital amplitude signal to an analog amplitude signal;
a power amplifier circuit coupled with the supply output of the supply modulator circuit to receive the supply voltage, having a gain input node to receive the analog amplitude signal, and configured to generate a signal output according to the supply voltage and to one of a plurality of gain settings indicated by the analog amplitude signal; and
a valley compensator having a lookup table coupled with the valley level input of the supply modulator circuit and configured to output a compensation signal to the valley level input responsive to receiving the digital amplitude signal, such that the compensation signal indicates one of a plurality of compensation values selected based on a present gain setting of the plurality of gain settings indicated by the digital amplitude signal,
wherein each compensation value is stored by the lookup table in association with a respective gain setting one of the plurality of gain settings, and
outputting each compensation value to the valley level input directs the supply modulator circuit to output the supply voltage at a respective compensated supply voltage level calibrated, so that applying the respective compensated supply voltage level and the respective gain setting to the power amplifier circuit generates the signal output to have an output valley level substantially at a predetermined target valley level.