Digital middle frequency multi-frequency multi-mode radio frequency module

A multi-mode radio frequency, digital intermediate frequency technology, applied in the direction of electrical components, transmission systems, etc.
CN1599269AInactive Publication Date: 2005-03-23南京东大宽带通信技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
南京东大宽带通信技术有限公司
Publication Date
2005-03-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a multiple frequency multi-mode RF module of digital medium frequency. In the transmitting chain, the baseband transmit message is sent to the antenna through the quadraphase modulator, variable gain amplifier, switch, power amplifier, duplexer and switch of the antenna. In the receive chain, the received signal enters the receiving front end through the switch of the antenna or duplexer and gets into the medium frequency after mixing. The frequency synthesizer outputs the signal, provides it to the quadraphase modulator, the receiving front end and the clock amplifier. The advantages of the invention lie in the following aspects: isolating or switching the transmitting and receiving signal through the duplexer or the switch of the antenna; adopting the dual-frequency quadraphase modulator and the board band matching variable gain amplifier has relatively good gain and standing wave feature; the receiving front end adopts the dual-frequency low noise mixer; that several modes use the same medium frequency filter restrains the spurious signals, reduces the load of the baseband and lowers the cost.
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Description

technical field

[0001] The invention relates to a radio frequency module in the field of mobile communication, in particular to a digital intermediate frequency multi-frequency multi-mode radio frequency module. Background technique

[0002] Multi-frequency and multi-mode radio frequency modules are widely used in various multi-frequency and multi-mode mobile phones. The multi-frequency and multi-mode radio frequency modules used in mobile phones mainly include GSM / WCDMA dual-frequency / dual-mode, GSM / WCDMA / cdma2000 / CDMA IS-95 Three-band / four-mode, GSM / WCDMA / TD-SCDMA three-band / three-mode, etc.

[0003] With the development of digital communication technology, the third-generation mobile communication system IMT2000, which aims to provide high-speed data transmission and multimedia service, came into being. It includes W-CDMA, cdma2000, TD-SCDMA and LAS-CDMA. In practical applications, there is an urgent need for mobile phones equipped with multi-frequency and multi-mode rad...

Claims

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