Multi-mode terminal and handover method for multi-mode terminal

A multi-mode terminal, comprising:

• a power management chip, a digital baseband chip, a first radio frequency chip, a second radio frequency chip, a first card socket, a second card socket, a first clock source and a second clock source, wherein:
• the power management chip is connected to the digital baseband chip, the first card socket and the second card socket to supply power to the digital baseband chip, the first card socket and the second card socket;
• the digital baseband chip is further connected to the first card socket and the second card socket, and is respectively connected to the first radio frequency chip and the second radio frequency chip through an in-phase/quadrature (I/Q) data line and a control line to transmit, receive and process I/Q signals with supported modes, as well as control transmission paths and reception paths with the supported modes;
• the first clock source is connected to the first radio frequency chip to provide a reference clock for the first radio frequency chip;
• the second clock source is connected to the second radio frequency chip to provide a reference clock for the second radio frequency chip, and a clock path is further connected between the first radio frequency chip and the second radio frequency chip, and the first radio frequency chip provides an output clock for the second radio frequency chip through the clock path to serve as the reference clock of the second radio frequency chip;
• wherein the digital baseband chip comprises a subscriber identity module (SIM) card processing unit, and the SIM card processing unit comprises a first SIM card processing unit, a second SIM card processing unit, and a multiplexer (MUX) one-to-one corresponding to each pin of the first card socket and the second card socket, one side of the MUX is connected to a corresponding pin, and the other side is respectively connected to functional ends of the first SIM card processing unit and the second SIM card processing unit which correspond to pins.