Multi-mode terminals and switching method of multi-mode terminals

Abstract

The invention discloses multi-mode terminals and a switching method of multi-mode terminals. Each multi-mode terminal comprises a power supply management chip, a digital baseband chip, a first radio frequency chip, a second radio frequency chip, a first clamping seat, a second clamping seat, a first clock source and a second clock source. The power supply management chip is connected with the digital baseband chip, the first clamping seat and the second clamping seat. The digital baseband chip also is connected with the first clamping seat and the second clamping seat and connected with the first radio frequency chip and the second radio frequency chip respectively through in-phase / orthometric I / Q data lines and control lines. The first clock source is connected with the first radio frequency chip and supplies a reference clock for the first radio frequency chip. The second clock source is connected with the second radio frequency chip and supplies a reference clock for the second radio frequency chip. A clock channel is arranged between the first radio frequency chip and the second radio frequency chip, the first radio frequency chip supplies the output clock to the second radio frequency chip through the clock channel, and works as a reference clock for the second radio frequency chip.

Description

technical field [0001] The invention relates to the field of terminal hardware, in particular to a multi-mode terminal and a switching method of the multi-mode terminal. Background technique [0002] At present, some telecom operators operate multiple networks of different standards, such as China Unicom owns GSM (Global System for Mobile Communications) network and WCDMA (Wideband Code Division Multiple Access) network, China Mobile owns GSM network, TD-SCDMA (Time Division Synchronous Code) network Division Multiple Access) network and TD-LTE (Time Division Long Term Evolution) network, etc. At present, the voice service of the LTE network uses the CSFB (circuit domain fallback) technology to realize the voice call function. It is required that the LTE terminal can fall back to the GSM network or other networks that can realize the voice function under the LTE network. This requires the LTE terminal to support the LTE mode and Other modes, and can support fast switching b...

AI Technical Summary

Problems solved by technology

Due to the inclusion of two sets of independent digital baseband chips and two sets of independent power management chips, it takes up a larger area when laying out the board

Two sets of independent SIM card holders. Two SIM cards of different modes cannot be placed in any card holder at will. The USIM / SIM card of any card holder can be read and written by any mode, which can realize multi-mode and multi-standby, but not Switching between multi-mode and single-standby modes

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