[sdiy] BBD question

[harrybissell at wowway.com]

BBD's pass essentially DC voltages from stage to stage, so there is no
filtering required betwrrn stages.  Likewise from a BBD output to another
BBD input (although buffering might be required...)

If a BBD clocked in a forset with no one around to hear it...
would it still SUCK ???   :^)

H^) harry   (surfaces after a long weekend...)





On Sat, 30 Aug 2008 14:36:32 -0700, Nicholas Gregorich wrote
> Magnus Danielson wrote:
> > Nicholas Gregorich wrote:
> >> Ian Smith wrote:
> >>> I've got the old Panasonic BBD manual and it shows one with a 20 kHz 
> >>> 12dB lowpass filter at both the input and output... I'm guessing 
> >>> that's to reduce clock noise. So I'm thinking have a filter at the 
> >>> beginning of the chain and between each BBD and one at the end.
> >>>
> >>
> >> The one at the input is probably considered an anti-aliasing filter, 
> >> and at the output a reconstruction filter (reduces clock noise). In 
> >> that case a filter between BBD stages is probably a good idea to 
> >> prevent aliasing in the second BBD.
> > 
> > How can you get aliasing in the second BBD when they run off the same 
> > clock? The second BBD will keep shifting the voltages just as if they 
> > where the same BBD.
> >
> 
> I guess this is the part I'm having a hard time with here, why is 
> there not aliasing between every single stage in a BBD?
> 
> Nick.
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Harry Bissell & Nora Abdullah 4eva