Analog-digital mixed channel selection filter

Abstract

The invention provides an analog-digital mixed channel selection filter in the technical field of digital communication. The analog-digital mixed channel selection filter comprises an amplification receiving module positioned in an analog domain, a frequency conversion module, a low-pass and analog-to-digital conversion module and a digital processing module which is positioned in a digital domain, wherein an input end of the amplification receiving module receives a radio frequency input signal and outputs the amplified radio frequency input signal to the frequency conversion module; the frequency conversion module outputs an analog baseband signal and is connected with an input end of the low-pass and analog-to-digital conversion module; the input end of the low-pass and analog-to-digital conversion module receives the analog baseband signal and outputs a baseband digital signal to the digital processing module; and the digital processing module outputs the digital baseband signal. In the invention, by using a simple low-order RC (Radio Control) low-pass filter as an analog filter, the dimension of a chip is effectively reduced, the power consumption is reduced and design and process requirements of the analog filter are largely simplified.

Description

technical field [0001] The invention relates to a digital communication technology system device, in particular to an analog-digital hybrid channel selection filter. Background technique [0002] Wireless digital communication systems, especially terrestrial broadcasting systems such as digital television, are used to transmit broadband, high data rate encoded information. In specific digital TV broadcasting applications, such as American digital TV standard ATSC broadcasting, European digital TV broadcasting standard DVB-T, European digital TV handheld broadcasting standard DVB-H, Chinese digital TV terrestrial broadcasting standard CTTB, and China Mobile multimedia broadcasting Standard CMMB, various standards define various channel bandwidths, such as ATSC, DVB-T, DVB-H, CTTB, CMMB, and the channel bandwidths of different systems range from 2MHz to 8MHz. And in most standards, especially digital TV signals, no matter in the VHF frequency band or in the UHF frequency band...

AI Technical Summary

Problems solved by technology

First of all, compared with the present invention, in order to realize the operation in multi-band and multi-mode, the present invention requires multiple radio frequency filters, tunable filters in series, and multiple branches in parallel, which brings little improvement in performance and flexibility. It is not high, but the cost, circuit design and heat dissipation are greatly increased, and the performance will also be limited by the limitations of the analog device itself, and the consistency is difficult to guarantee

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