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Device for improving influence on CDMA sensitivity from GSM switch in dual modes handset

A circuit device, radio frequency switch technology, applied in the direction of selection device, electrical components, transmission system, etc., can solve the problems of CDMA receiving sensitivity, affecting CDMA sensitivity, etc.

Inactive Publication Date: 2010-01-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to overcome the problems in the prior art, the present invention provides a kind of device that is used to solve the dual-mode mobile phone GSM switch to affect the CDMA sensitivity, fundamentally solve the problem that the CDMA receiving sensitivity is affected by the GSM circuit return when the dual-mode mobile phone transmits at high power in CDMA. The influence of the noise

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  • Device for improving influence on CDMA sensitivity from GSM switch in dual modes handset
  • Device for improving influence on CDMA sensitivity from GSM switch in dual modes handset
  • Device for improving influence on CDMA sensitivity from GSM switch in dual modes handset

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Embodiment Construction

[0025] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0026] The source of this type of interference as described above is the switching of RF switches. For the GSM signal, since the transceiver path is closed during the switching process of the switch, no additional frequency will be generated due to the switching of the switch. For the CDMA transmission signal, because there is no suppression and isolation measures between the switch and the antenna, the CDMA transmission signal directly falls on the GSM radio frequency switch, and the impedance transformation generated at the moment of switch switching leads to the spectrum expansion of CDMA, and then It is transmitted by the GSM antenna without hindrance. Therefor...

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Abstract

The invention comprises: a RF amplifier and a receiving filter. It also comprises: a duplexer whose public end is connected to the antenna; two circulators each having public port, transmitting path port and receiving path port, and wherein each public port is respectively connected to the low frequency port and high frequency port of the duplexer; two RF switch groups respectively connected between the two circulators and the receiving path, and wherein each port at each RF switch side is respectively connected to the transmitting path port and the receiving path port of each circulator, and the other port at RF switch side is respectively connected to the output port of RF amplifier and the input end of the filer.

Description

technical field [0001] The invention relates to a device for improving the influence of a GSM switch on CDMA sensitivity in a GSM / CDMA dual-mode mobile phone. Background technique [0002] The GSM / CDMA dual-mode mobile phone is a mobile communication terminal that supports both GSM and CDMA in standby mode and even simultaneous communication. This type of dual-mode mobile phone has mutual interference when the wireless modules of the two standards work at the same time due to the proximity of frequencies, which has a certain impact on their respective wireless performance, referred to as GC mutual interference. [0003] There are many types of GC mutual interference, and the present invention focuses on a type in which the interference path is relatively subtle and the interference effect is obvious. We found in the research that when GSM is in standby, the switch of the front-end RF switch will have a sudden impact on the sensitivity of CDMA. As long as CDMA is in a high-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/32H04B1/40H04B1/3827H04B1/44H04W88/06
Inventor 秦宇程守刚
Owner ZTE CORP