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

[Phil Macphail]

This book is probably the best, reasonably priced, reference for this kind
of thing -

Analogue IC Design: The Current-Mode Approach

Editor(s):	 C. Toumazou, F. J. Lidgey, D. G. Haigh
Published: 1993
Print ISBN13: 9780863412974
eISBN: 9781849191647

If you are a member of the IET then it is a bargain - essential reading
for bipolar analogue design, and covers techniques that are not covered
elsewhere. It's not for beginners who want circuits to copy, but for a
thorough grounding in all the translinear techniques (such as the
linearising diodes, mirrors, current conveyors etc.) it can't be beaten.

Not bad for a book that's 20 years old!

Phil.



On 02/07/2012 20:45, "Harry Bissell" <harrybissell at wowway.com> wrote:

>When I tried to make a spice model of an OTA using separate transistor
>and diode models...
>it did not work.  I had to use diode connected transistors...
>
>as Ian so succinctly put it "Matching is crucial"
>
>(so I guess I agree :^)
>
>H^) harry
>
>
>----- Original Message -----
>From: Ian Fritz <ijfritz at comcast.net>
>To: Justin Owen <juzowen at gmail.com>, SDIY List
><synth-diy at dropmix.xs4all.nl>
>Sent: Mon, 02 Jul 2012 15:15:59 -0400 (EDT)
>Subject: Re: [sdiy] Discrete OTAs - (was - Best CA3280 projects?)
>
>At 05:49 AM 7/2/2012, Justin Owen wrote:
>>Out of the people who've experimented with designing discrete OTAs -
>>have 
>>any of you implemented the 'linearizing diodes' that the LM13700(?) had?
>>
>>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.
>
>I used diode-connected transistors from a well-matched pair of CA 3083
>devices.  Matching is crucial.
>
>Ian
>
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