Systems and methods for improving output stability of a radio frequency power amplifier by gain compensation and correction

A method for improving output stability of a radio frequency power amplifier (RFPA), the method being implemented on one or more processing circuits operably connected with the RFPA, the method comprising:

• obtaining an initial radio frequency signal to be amplified by the RFPA;
• generating a compensated radio frequency signal by performing, based on a preset compensation rule and a set of compensation parameters, a gain compensation operation for the initial radio frequency signal, wherein the preset compensation rule includes a series of mapping relationships between a gain compensation quantity and the set of compensation parameters, the set of compensation parameters includes a supply voltage of the RFPA and a transistor junction temperature of the RFPA, and the transistor junction temperature of the RFPA is designated to be an actual maximum temperature of the RFPA, or a sum of an ambient temperature and a transistor junction temperature rise of the RFPA;
• and
• generating, by performing a non-linear correction operation on the compensated radio frequency signal, a corrected radio frequency signal, which is transmitted to the RFPA.

A radio frequency system, comprising:

• one or more processing circuits configured to obtain an initial radio frequency signal to be amplified by a radio frequency power amplifier (RFPA), generate a compensated radio frequency signal by performing, based on a preset compensation rule and a set of compensation parameters, a gain compensation operation for the initial radio frequency signal for improving output stability of the RFPA, wherein the preset compensation rule includes a series of mapping relationships between a gain compensation quantity and the set of compensation parameters, the set of compensation parameters includes a supply voltage of the RFPA and a transistor junction temperature of the RFPA, the transistor junction temperature of the RFPA is designated to be an actual maximum temperature of the RFPA, or a sum of an ambient temperature and a transistor junction temperature rise of the RFPA, and generate, by performing a non-linear correction operation on the compensated radio frequency signal, a corrected radio frequency signal, which is transmitted to the RFPA;
• the RFPA configured to generate an amplified radio frequency signal by amplifying the corrected compensated radio frequency signal;
• and
• radio frequency coils configured to generate, after being driven by the amplified radio frequency signal, a radio frequency magnetic field for imaging.