Dual-mode terminal

Abstract

The invention disclose a dual-mode terminal, comprising a TD radio frequency system comprising TP transmitting chip and TD linear power amplifier, and a GSM radio frequency system comprising GSM transmit-receiving chip and first SAW (Surface Acoustic Wave) filter, where the TD radio frequency system also comprises: medium filter to reduce leakage of sideband noise of TD-SCDMA signal in the GSM receiving frequency range; and the GSM system also comprises: second SAW filter connected between the first SAW filter and second antenna to reduce power of received TD-SCDMA signal. Therefore, it effectively reduces out-of-band leakage of TD transmitted signal and improves anti-jamming performance of the GSM receiver, so as to reduce the interference of TD-SCDMA signal of TD-SCDMA / GSM dual-mode terminal to the GSM system.

Description

technical field [0001] The present invention relates to a mobile terminal, more specifically, to a TD-SCDMA / GSM dual-mode terminal. Background technique [0002] As the third generation mobile communication (Third Generation, referred to as 3G) standard independently developed by China, the Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network will start trial operation in the near future , but had to face the problem of insufficient network coverage in the initial stage of construction. If this practical problem cannot be solved well, it will greatly affect the development of TD-SCDMA network users. The best solution to this problem at present is to supplement the TD-SCDMA network with the help of other networks. [0003] In the environment where TD-SCDMA network exists, users can use the superior performance of 3G network, and in the absence of TD-SCDMA network, they can also use services of other networks to ensure normal communication of users. Th...

AI Technical Summary

Problems solved by technology

The focus of these two methods is to increase the isolation between the antennas, but the effect is not ideal, and it also brings corresponding problems. Among them, the first method must increase the distance between the antennas. The size of the mobile phone is lengthened, which affects the beauty and fashion of the mobile phone, and the second method will affect the performance of the antenna, which in turn affects the overall performance of the mobile phone and call quality

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