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RF/Microwave??

Tuner delivers high-definition DVB-S2 broadcast

Posted: 27 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DVB-S2? digital BS tuner unit? demodulator? digital video broadcasting?

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Alps Electric has developed a digital video broadcasting - Satellite 2 (DVB-S2) digital BS tuner unit with an internal demodulator BSBE2 series for use in TVs and STBs compatible with high-definition satellite digital broadcasting. The high-definition (HD) DVB-S2 format has been used in Europe since 2006, with plans to be adopted in Japan by 2008.

This tuner for satellite digital broadcasts is compatible with both the HD DVB-S2 and standard DVB-S screen formats. While it is useable with both formats, it is the same size as its predecessor, the BSBE1 series (41mm x 73.3mm x 13mm) which could only be used with the DVB-S format.

Moreover, the structure of the exterior cladding of the tuner is effective in reducing heat dissipation and noise, leading to greater reliability and anti-noise performance.

The tuner's internal demodulator IC causes heat to be generated when the digitally altered signals are modulated. The heat source is in the upper section of the demodulator IC. Opening a hole in the part of the cover over the upper section and bringing the lower section of the circuit board used for the IC into contact with part of the outer cover, can create a double thermal insulation structure which is very effective for dissipating heat.

Aside from preventing the signals emitted by the oscillator inside the tuner from influencing other parts of the set as noise, the cover over the exterior cladding also serves to muffle digital noise emanating from the set's decoder or CPU.

Three types of mounting are available, for each of which there are further options in the mounting structure and distributing parts, offering a range of six variations for greater design flexibility.

The BSBE2 series has an input frequency range of 950-2,150MHz and an input level range of -65 to -25dBm. It has an Input VSWR of 2 (typ.) and an operating supply voltage rating of 3.3V and 1.25V. It also features an I?C bus for tuning control.

Samples are shipping now with volume pricing starting at $19. Mass production slated in October.




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