[opendtv] Re: New PrimeDTV PHD-100 OTA STB

  • From: Richard Hollandsworth <holl_ands@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Mon, 30 Jan 2006 16:10:35 -0800 (PST)

In the dozens of spec sheets and app notes that I've read, I've never seen a 
separate RF/IF Tuner Module just for NTSC.
They all show a common RF/IF Tuner.

Mark Aitken <maitken@xxxxxxxxxx> wrote: Because of the close integration of the 
demod chip with the tuner, more 
than likely there is a second NTSC tuner circuit, which would require a 
RF split...
Richard Hollandsworth wrote:

>I don't see how adding an NTSC/BTSC decoder chip affects the Noise Figure.
>The output of the IF Amplfier strip would presumably be split to feed both the 
>ATSC/QAM Decoder chip and the NTSC/BTSC decoder chip.  Since the IF Splitter 
>loss would be at the end of the IF Amplifier chain, the reduction in overall 
>Noise Figure would be much, much less than a dB.
>Of course if the NTSC/BTSC decoder function were built into the ATSC/QAM 
>Decoder chip, using a common A/D Converter, there would be no need for an IF 
>for example the Broadcom BCM3520 ATSC/QAM/NTSC/BTSC Decoder chip and BCM3560 

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