Digital pre-distortion circuit and method for generating pre-distortion signal

A digital pre-distortion circuit, comprising:

• a memoryless non-linear operating circuit, arranged to perform a memoryless non-linear operation upon a transmission signal to generate a first signal, wherein the memoryless non-linear operation simulates a non-linear operation of a radio frequency (RF) power amplifier configured in a wireless communication transmission device under a memoryless effect, the first signal is an output simulation signal of the RF power amplifier under the memoryless effect, and the first signal comprises a signal component corresponding to the transmission signal and a signal component corresponding to an intermodulation signal of the transmission signal;
• an intermodulation shaping filter circuit, coupled to the memoryless non-linear operating circuit, and arranged to filter the first signal to generate a second signal, wherein the second signal simulates the intermodulation signal generated by the RF power amplifier in response to the transmission signal under a memory effect;
• and
• a signal combination circuit, arranged to combine the transmission signal and the second signal to generate a pre-distortion signal.