Wireless communications system, power supply system, and terminal device

A wireless communications system, comprising:

• a power supply circuit configured to receive an envelope signal and supply power to a first power amplifier circuit and a second power amplifier circuit, wherein
• the power supply circuit comprises an envelope tracking modulator coupled to the first power amplifier circuit and the second power amplifier circuit and is configured to receive the envelope signal and output an envelope voltage, and the power supply circuit further comprises an inductor filter circuit coupled to the first power amplifier circuit and the second power amplifier circuit and configured to receive the envelope voltage, wherein
• the first power amplifier circuit is configured to receive a transmit signal;
• and when a bandwidth of the transmit signal meets a first bandwidth range, amplify the transmit signal to output a first amplified output signal;
• and
• the second power amplifier circuit is configured to receive the transmit signal;
• and when the bandwidth of the transmit signal meets a second bandwidth range, amplify the transmit signal to output a second amplified output signal.