The development of the tuner from the module built by the initial discrete device to the later double conversion intermediate frequency output, although this architecture has been toward the trend of ICization of the tuner, the disadvantage is that it still needs two external SAW filters to complete The function of the tuner failed to fully integrate the IC. Zero IF technology can save the first SAW filter, and the second SAW filter can be replaced by a channel selection filter, so this architecture is suitable for fully integrated silicon tuners. The current silicon tuners are basically all with Zero IF Of dual conversion tuner or single conversion tuner with Zero IF. Silicon tuners will develop towards the requirements of small size, low power consumption and high integration to meet the needs of mobile TV.
After the three major areas of satellite, terrestrial and cable transmission, digital TV will become the focus of the current and future major manufacturers. The current mobile TV standards include DVB-H / S, ISDB-T, T-DMB, There are many kinds of MediaFLO, ATSCM / H and CMMB, which are dazzling. However, the tuner should not be greatly affected by the difference in standards. At present, the spectrum of various mobile TV standards mainly involves four frequency bands: VHF III (174-240MHz), UHF (470-862MHz), L1 ( 1450-1492MHz), L2 (1660-1685MHz). Semiconductor manufacturers often design tuners that support different standards to meet different needs. The following introduces you to various types of colorful tuner products from different suppliers.
Considering the factors of chip size, power consumption and cost, many tuners may only support one or two mobile TV standards. The TDA18291HN silicon tuner from NXP uses BiCMOS technology to tune the DVB-H standard in the VHF III (174Mhz to 230Mhz) and UHF (470Mhz to 862Mhz) frequency bands, with integrated LNA, orthogonal mixer, and channel filtering , PLL and VCO. In DVB-T mode, the power consumption is only 150mW. The 5 * 5mm2 QFN 32-pin package is very suitable for mobile devices such as mobile phones, PDAs, PNDs, etc. Other suppliers' products, such as Analog's ADMTV202, ADMTV340, and ADMTV3010, are used for ISDB-T, CMMB, and T-DMB applications, respectively; Infineon's TUA9001 is used for DVB-H / T;
In fact, most tuners will face the application of multiple mobile TV standards to meet the needs of different regions for mobile TV standards, which is more convenient for OEM manufacturers to design and produce. ADMTV102 from ADI is such a tuner that meets various mobile and terrestrial TV standards of DVB-H / T, T-DMB, CMMB, DMB-TH. The device covers band-III, UHF, L-band, and can even support 65-108Mhz FM. It integrates LNA, Mixer, PLL and VCO on the basis of no SAW filter, 5 * 5mm2 QFN 32-pin package The power consumption is only 180mW. NXP's TDA18292HN ultra-low power multi-band silicon tuner supports record-breaking DVB-T, DVB-H, DVB-SH, T-DMB and ISDB-T standards and VHF III, UHF, L1-band, L2-band And S-band and other mobile TV bands. The power consumption of the 5 * 5mm2 QFN 32-pin package in DVB-H mode has reached an amazing 20mW. Let us look forward to the multi-band, multi-standard silicon tuner NXP.
Due to the high requirements of the tuner in terms of signal sensitivity, noise figure and AGC (automatic gain control), RF signals with a frequency of more than 1Ghz also cause EMC problems, which brings certain difficulties to the design of OEM manufacturers. More tuner products are combined with the demodulator core or IC and supplied as a SiP IC or AFE module. The smaller AFE module can even be directly connected to the back-end source decoder through the SDIO interface like an SD card. (MPEG or H.264 decoder) IC is connected. HollywoodTM SoluTIon DTV1000 and DTV1001 from TI combine tuner and demodulator functions and are specially designed for mobile TV. The DTV1000 works in the UHF and L-band frequency range and is suitable for the DVB-H standard. The DTV1001 complies with the ISDB-T standard. Infineon's OMNIVIATM TUS9090 uses a 0.13um RF-CMOS process and supports DVB-T / H standards in the VHF, UHF and L-bands bands. Sharp Corporation developed a VA3C5CZ933 specifically for the Chinese mobile TV market at the end of 2008, and supports the CMMB standard in the UHF470-798Mhz frequency band. The specific information is as follows:
Mobile TV will appear on any currently popular handheld device, fundamentally subverting the traditional concept of viewing. This must rely on the high integration and low power consumption technology of semiconductor manufacturers on the core chip, and the tuner will obviously not be excluded.
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