Integrated television receiver applicable to a plurality of television signal standards

Abstract

The invention discloses an integrated television receiver applicable to a plurality of television signal standards. The integrated television receiver receives a radio-frequency input signal; a tracking filter adjusts center frequency of self-filtering according to a selected channel, which causes that the television receiver can be taken as an analog television receiver or a digital television receiver. Furthermore, the tracking filter is used for filtering a fifth harmonic signal and the harmonic signals after the fifth harmonic signal in the radio-frequency input signal, a band pass filteris used for further filtering harmonic components, and a biorthogonal signal mixer is used for filtering a third harmonic signal in the radio-frequency input signal, therefore, the tracking filter does not need very high qualitative factor, and the linearity requirement of the band pass filter can be further lowered at the same time. Therefore, a variable capacitor and an inductor of the trackingfilter, the band pass filter and the like can be arranged in a chip, thus reducing the system material cost and the area of a printed circuit board.

Description

technical field [0001] The present invention relates to television receivers, and more particularly to an integrated television receiver adaptable to multiple television signal standards. Background technique [0002] Common television receivers mostly use a super-heterodyne architecture with one or two IF stages. Therefore, these TV receivers will include external tracking (tracking) filters and surface acoustic wave (Surface acoustic wave, SAW) filters, which not only increases system BOM cost and power consumption, but also causes a large number of external components It is not conducive to the integrated design of the chip. [0003] In addition, the digital TV receiver is relatively insensitive to DC voltage offset (DC Offset), suitable for Zero-IF (Zero-IF) architecture, and has better channel selectivity and image rejection (image rejection limitation) characteristics. However, analog TV receivers are more sensitive to DC voltage offset, so they are suitable for Low-...

AI Technical Summary

Problems solved by technology

However, analog TV receivers are more sensitive to DC voltage offset, so they are suitable for Low-IF architecture, but the low-IF architecture needs to solve the problems of poor channel selectivity and image interference

It can be seen that because analog and digital TV receivers have many different signal characteristics, it is bound to face high complexity and difficulty when integrating analog and digital TV receivers into one chip at the same time.

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