[sdiy] Discrete OTAs - (was - Best CA3280 projects?)

Kyle Stephens lightburnx at yahoo.com
Mon Jul 2 22:43:46 CEST 2012


Good book (availible soft and hard, the former of which is *free*) on the subject:

http://www.designinganalogchips.com/

It's moving up a few orders of scale, but same priciples still mostly apply.


_Kyle

--- On Mon, 7/2/12, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:

> From: Lanterman, Aaron <lanterma at ece.gatech.edu>
> Subject: Re: [sdiy] Discrete OTAs - (was - Best CA3280 projects?)
> To: "Synth DIY" <synth-diy at dropmix.xs4all.nl>
> Date: Monday, July 2, 2012, 12:58 PM
> On Jul 2, 2012, at 3:34 PM, ASSI
> wrote:
> 
> >> I'd be curious to see how you did this, whether you
> actually used diodes
> >> or half a transistor (don't laugh - that's what
> I've read) and what
> >> advantage it got you - if any.
> 
> To my knowledge, all diodes you find on chips are
> "diode-connected" transistors. (Both BJT and MOSFETs).
> 
> It also takes a while to get used to seeing some transistors
> more-or-less intended to act as resistors. Resistors on
> chips are expensive real-estate-wise and difficult to set
> precisely.
> 
> The chip design space really turns your
> discrete-on-breadboard intuition upside down.
> 
> - Aaron
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