[sdiy] IC design books as a source of discrete OTA schematics?

[Justin Owen]

Hi Magnus,

> A good warm-up is for instance this article:
http://www.idea2ic.com/LM13600/UsingOTAs2.pdf

> It can be a good exercise to get and read datasheets for the classics, 
and see how their topology changes over time.

That, a couple of other articles and the 'simplified schematic' pages of a few select OTA data sheets has been my entire OTA library for the last year or so - which is why I wanted to take a step up.

> Essentially, you have a diff-pair and 4 current mirrors. 

This was one of the specific questions I had - why/how does increasing the number of current mirrors improve the performance? You can make an OTA with a single current mirror on top of the diff-pair but I've seen versions with 2 and versions with 4 current mirrors (plus the output stages). The type of current mirror can change as well - most of the time it's a 2x transistor mirror - but I've seen versions using a 4x transistor mirror.

> You can then 
learn more on current mirrors and how good various variants performs. 
Current mirrors is a design which re-occurs over and over again in IC 
design, so it's well covered in the Gray & Meyer book. It also covers 
linearization and Gilbert cells.

That sounds like what I'm after. alibris.co.uk had a copy for a fiver which I grabbed along with the Delton Horn book Dan suggested - thanks to you both.

J






Cheers,
Magnus
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