[sdiy] BBD question

[Magnus Danielson]

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.

Cheers,
Magnus