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.

Inactive Publication Date: 2005-03-23
南京东大宽带通信技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The multi-frequency and multi-mode radio frequency module that can realize free switching among several different systems such as W-CDMA, cdma2000, TD-SCDMA and LAS-CDMA has not been reported yet

Method used

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

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Embodiment Construction

[0010] Accompanying drawing discloses the principle block diagram of the present invention, the present invention will be further described below in conjunction with accompanying drawing, by figure 1 visible:

[0011] Transmission channel; the direct conversion modulator is a dual-band quadrature modulator, and the quadrature IQ signal of W-CDMA, cdma2000 or TD-SCDMA / LAS-CDMA given by the baseband interface is sent to the direct modulator 1, and the direct modulation In the device 1, the frequency synthesizer 12 provides a local oscillator of 1920MHz-1980MHz for the W-CDMA mode, provides a local oscillator of 824MHz-849MHz for the cdma2000 mode, and provides a local oscillator of 2010MHz-2025MHz for the TD-SCDMA / LAS-CDMA mode. The radio frequency signals of the four modes output by the direct modulator 1 are sent into the wideband variable gain amplifier 2, and the amplified signals are sent to three power amplifiers separately through the multiplexing switch 3, which are resp...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/44
Inventor 赵嘉宁陈建宏彭明勇何晓晓姚雄生王建军夏燕朱晓维
Owner 南京东大宽带通信技术有限公司
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