[sdiy] How to use an analog time-domain multiplexer?

Tom Wiltshire tom at electricdruid.net
Fri Jun 4 13:00:23 CEST 2021


I use this tool:

http://sim.okawa-denshi.jp/en/OPtazyuLowkeisan.htm

There’s a 3rd order version too. If you want 4th or >4th order, you’ll have to look up the required Q values.


==================
       Electric Druid
Synth & Stompbox DIY
==================



> On 4 Jun 2021, at 09:57, cheater cheater <cheater00social at gmail.com> wrote:
> 
> Could you please recommend a book or paper that describes the MFB
> filter in the form which you're talking about?
> 
> Thanks
> 
> On Fri, Jun 4, 2021 at 10:53 AM Tom Wiltshire <tom at electricdruid.net> wrote:
>> 
>> 
>> 
>>> On 4 Jun 2021, at 09:42, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:
>>> 
>>> 
>>> 
>>>> On 04.06.2021, at 10:14, Tom Wiltshire <tom at electricdruid.net> wrote:
>>>> 
>>>> For the bandlimiting filter, I don’t think it matters so much.
>>> 
>>> Hi Tom, I don’t see why not?
>>> What CC describes is the same process before an A/D-conversion and after a D/A-conversion, just without the binary part.
>>> And IMHO of course Nyquist-Shannon applies here.
>> 
>> Yes, of course it does. All I meant was that I don’t think the bandlimiting filter is so fussy about whether it should be Sallen-Key or MFB or whatever. For the reconstruction filter, I can see reasons why it should be MFB.
>> 
>> But definitely both filters are needed, and this is exactly a sampling process without the ADC/DAC step.
>> 
>> 
>> 
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