gradual development

TV television tuner on knowledge of small class
With LCD TV's substantial price adjustment, more and more new products into people's perspective. And then increased and new nouns, names. They are factory carefully the development of new technology, but also represent the future direction of product development. Of course, they are to meet consumer demand and gradual development. In order to everybody to better understand these new changes, the author specifically to the TV tuner on, for you.
In fact, the tuner development from the initial discrete building blocks, then the double conversion if output, this architecture has been towards the tuner IC trend, but its drawback is that still requires two external SAW filter, to complete the function of IC tuner,DVB-T TUNER failed to achieve full integration. Zero IF technology can save the first SAW filter, and second SAW filters can be channel selection filter to replace, so the architecture is suitable for fully integrated silicon tuner present silicon tuner basically all is a Zero IF double conversion tuner or a Zero IF single conversion tuner. Silicon tuner towards small size, low power consumption and high integration degree requirements development to adapt to the need of the mobile television, now many television using a low power TV tuner.
In the following, the ground satellite and cable transmission of three big fields, digital TV will be present and future major manufacturers of power competition focus, at present about mobile TV standard has DVB-H/S, ISDB-T, T- DMB, MediaFLO, ATSCM/H and CMMB and so on many kinds of, let people see things in a blur. However, tuner and not for different standard greatly affected, at present a variety of mobile TV standard spectrum involves four main frequency: VHF III (174-240MHz ), UHF (470-862MHz ), L1(1450-1492MHz ), L2(1660-1685MHz ). Semiconductor manufacturers will often be designed simultaneously support different standards to meet the different needs of tuner. Below are introduced from different suppliers of various types, rich and colorful tuner products.
Because the chip size, power consumption and cost and other factors, many of the tuner may support only one or two kinds of mobile TV standard. From NXP TDA18291HN silicon tuner using the technology of BiCMOS, in VHF III (174Mhz to 230Mhz) and UHF (470Mhz to 862Mhz) within the frequency range of DVB-H standard tuning, the internal integration of LNA, quadrature mixer, a channel filter, PLL and VCO. In DVB-T mode, power consumption is only 150mW. 5*5mm2QFN 32pin package is very suitable for mobile devices such as mobile phone, PDA, PND etc.DVB T RECEIVER Other suppliers of products, such as Analog ADMTV202, ADMTV340, ADMTV3010respectively for ISDB-T, CMMB and T-DMB; Infineon TUA9001for the DVB-H/T; mobile TV will be popular in the current any handheld device, fundamentally to subvert the traditional concept of viewing. It must rely on the semiconductor manufacturers in the core chip high integration and low power technology, tuner obviously will not be excluded.
For the TV tuner, in fact we as long as it is a preliminary understanding on the line, and all about it is to remind consumers in the purchase TV after a little worry, more of a master.