AW: Re: Wasp

Haible_Juergen#Tel2743 HJ2743 at denbgm3xm.scnn1.msmgate.m30x.nbg.scn.de
Tue Apr 2 22:19:00 CEST 1996


>>  - If memory serves, some opamp functions are implemented with CMOS
>>   inverters and feedback. (even in the filter!)
>
>This is one of those low-cost tricks that are detailed in ElectroNotes.
>Seems you can get 6 decent quality op-amps for cheap this way, but it's
>not very versatile.
>
>I thought about building a vocoder this way, then
>decided that a vocoders too important to sacrifice sound quality.
>
>If you're interested I'll dig up some more info.

I think the pro side is that CMOS inverters are rather fast (as long as you 
don't
load them with capacitors). But the cons are low dc gain and high output
impedance. Especially the high output impedance might cause some
surprise in filter designs ...

JH.



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