Broadband tuner based on band pass sigma-delta and method thereof

Abstract

The invention relates to a broadband tuner based on band pass sigma-delta modulation and a method thereof. The broadband tuner comprises a low noise preamplifier, an anti-aliasing low pass filter and a sigma-delta ADC modulator circuit. The method comprises the following steps: an input signal obtained from an antenna is inputted to the low noise preamplifier of the tuner of the invention; the signal processed by the low noise preamplifier is inputted to the anti-aliasing low pass filter; the signal processed by the anti-aliasing low pass filter is inputted to a band pass sigma-delta modulation circuit for modulation; and after the modulation of the band pass sigma-delta modulator circuit, a digital signal is outputted. The invention utilizes the sigma-delta ADC to sample the input signal, thus an analogue signal can be directly introduced into a digital signal domain, the digital signal is outputted by the tuner, and then reduced frequency processing or filtration processing is carried out on the digital signal, thereby avoiding the defect of integrated level caused by simulating mixed frequency and reduced frequency in the prior art and at the same time, as band pass modulation is used, the broadband of the input signal and the dynamic requirements of the sigma-delta ADC are reduced.

Description

【Technical field】 [0001] The invention relates to the field of electronic circuits, in particular to the field of digital TV broadband tuners. 【Background technique】 [0002] With the development of communication technology and compression technology, global TV broadcasting has gradually developed from analog TV broadcasting to digital TV broadcasting. In digital TV broadcasting, the program producer transmits the digital program signal, and the user terminal receives the signal through the digital TV receiving device and converts it into a picture that can be played on the TV. [0003] Such as figure 1 As shown, the entire signal transmission process of the existing digital TV mainly includes: the radio frequency digital program signal received by the antenna of the digital TV receiving device, and then the radio frequency signal received by the antenna is modulated by a tuner, wherein the function of the tuner is the same as that of a general The function of the wireless...

AI Technical Summary

Problems solved by technology

The disadvantage of the existing digital-analog hybrid solution is that it requires an analog-to-digital converter (ADC) with a high dynamic space when performing analog-to-digital conversion, and at the same time, due to the existence of a large number of out-of-band signals, the interference of phase noise is also very significant

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