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Channel receiver

A channel reception and signal technology, applied in electrical components, transmission systems, etc., can solve problems such as difficult integration and complex design, and achieve the effect of reducing chip cost, easy design, and simplifying design difficulty

Inactive Publication Date: 2008-06-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0014] The purpose of the present invention is to solve the above-mentioned problem of complex design and difficult integration in the prior art, to provide a method that can not only effectively suppress the adjacent channel interference in the receiving process, realize the adjacent channel selectivity index of the mobile phone terminal, but also reduce the complexity of the design , a channel receiving device that facilitates design and mass production of products

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0030] See image 3 , image 3 It is a schematic diagram of the channel receiving device proposed by the present invention. The signal received by the antenna 1110 enters the radio frequency bandpass filter 101, the low noise amplifier 102, the first mixer 104 and the second mixer 104' in turn; one side of the local oscillator 105 is connected to the mixer 104 and the other side passes through After the phase is shifted by 90 degrees, the mixer 104' is connected; after the signal of the first mixer 104 is output, it enters the first first-order low-pass filter 106, the first variable gain amplifier 107 and the analog-to-digital converter in sequence, and the second mixer After the signal of the frequency converter 104' is output, it sequentially enters the second first-order low-pass filter 106', the second variable gain amplifier 107' and the analog-to-digital...

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Abstract

The invention relates to a channel receiving device. The technical proposal is that the signal received by an antenna (1110) is fed in order into an RF band-pass filter (101), a low noise amplifier (102), a first mixer (104) and a second mixer (104'); one side of a local oscillator (105) is connected with the first mixer (104), and the other side of the oscillator (105) is connected with the second mixer (104') after a 90 degree phase shift; the signal output from the first mixer (104) is fed in order into a first one-order low pass filter (106), a first variable gain amplifier (107) and an A / D converter, and the signal output from the second mixer (104') is fed in order into a second one-order low pass filter (106'), a second variable gain amplifier (107') and the A / D converter; The signal output from the A / D converter is fed in order into a compensation filter (108) and a matched filter (109). The invention has the advantages that the channel receiving device has a high performance of the adjacent channel selectivity and can reduce the adjacent channel interference efficiently and simply the design of the analog filter; meanwhile, the chip area is reduced to a large extent, thereby reducing the chip cost and increasing the success ratio of fabrication.

Description

Technical field [0001] The present invention relates to the field of wireless communication, in particular to a channel receiving device. Background technique [0002] Different standard mobile phone terminals have stipulated ACS (Adjacent Channel Selectity, adjacent channel selectivity index) index, which stipulates the ability of the mobile terminal to receive useful signals in the presence of adjacent channel signals. For example, the ACS in the TD-SCDMA specification has the following requirements: the useful signal power is -91dBm, and there is a modulated interference signal when deviating from the useful signal + / -1.6MHz, and its power is -54dBm. In this case, the error code of the channel receiving device Rate (Bit Error Ratio, BER) does not exceed 0.1%. [0003] How to design a receiving channel to meet this index, there are two existing technologies: [0004] 1) For channel receiving devices with superheterodyne structure, such as figure 1 Shown. After the signal is re...

Claims

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Application Information

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IPC IPC(8): H04B1/26H04B1/707
Inventor 王险峰赵林新
Owner SPREADTRUM COMM (SHANGHAI) CO LTD