Abstract: An analog pre-distortion processing circuit and a signal processing device, the analog pre-distortion processing circuit comprises a narrowband spread spectrum module, an analog pre-distortion module and a filtering module. The narrowband spread spectrum module is used for spreading an input narrowband radio frequency signal into a broadband radio frequency signal. The bandwidth of the broadband radio frequency signal is a preset bandwidth. The analog pre-distortion module is used for carrying out analog pre-distortion linearization processing on the broadband radio frequency signal to obtain a linearized broadband radio frequency signal; the preset bandwidth is located in the optimal cancellation bandwidth of the analog pre-distortion module. The filtering module is used for carrying out signal filtering on the linearized broadband radio frequency signal to obtain a linearized narrowband radio frequency signal.

Abstract: An auxiliary control circuit (100) for a power amplification module, a power amplification module, and a communication device. The auxiliary control circuit (100) for the power amplification module comprises a main control chip (201), a current detection chip (12), and a precision adjustment unit (14). The precision adjustment unit (14) is connected in parallel to a precision control resistor of the current detection chip (12), and a switch control terminal of the precision adjustment unit (14) is electrically connected to the main control chip (201) and is used for adjusting an output voltage amplification factor of the current detection chip (12) when a switch signal outputted by the main control chip (201) is received. A detection input terminal of the current detection chip (12) is used for accessing a voltage to be measured of a power amplifier transistor power supply circuit (102) of the power amplification module.

Abstract: a high-power uplink and downlink switching device and a communication apparatus are disclosed. A radio frequency switch and a synchronization control module of the device cooperate. A circulator has a first port connected to an output end of a power amplification module, a second port connected to a second radio frequency port, and a third port connected to a low-noise amplifier module via a first radio frequency switch. The third port is further connected to a high-power load resistor and a second radio frequency switch via a first microstrip line, so as to be separately grounded. A radio frequency impedance from a first end to a second end of the first microstrip line is in a high-impedance state.