[sdiy] BBD clock bleed

Tom Wiltshire tom at electricdruid.net
Wed Oct 24 15:39:37 CEST 2018



> On 24 Oct 2018, at 11:28, rburnett at richieburnett.co.uk wrote:
> 
> Did no BBD manufacturers ever include switched-capacitor filters built in to their BBD chips?

Nope, but it’s a lovely idea! Maybe one of those modern re-manufacturers could take the idea up. V3205 with built-in filters would be a popular idea...

> On 24 Oct 2018, at 12:33, Uwe Schueler <uwe.schueler at uni-tuebingen.de> wrote:
> 
> all suggested filter and companding stuff adds a lot of complexity and $s. Maybe for these $s you could add a 2nd BBD in parallel, fed by the inverted input signal and diff.amp the outputs. This should improve SNR by 6db and cancel a lot of clock feed through - in theory;-)

Now, this one Reticon did do. The SAD1024A is organised as a dual 512 stage device, and one of the suggestions in the datasheet is that it can be used as you describe.

http://www.pmerecords.com/Docs/Archer_SAD-1024_Tech_Data.pdf


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