[sdiy] books on analog MOS IC design ?

[patchell]

    I can only speculate, but, if like a lot of things, it problably happened
that way just because nobody thought about it.

    I don't know why, but this brought up the old S-100 computer bus in my
thoughts...I always thought it was really silly how the pins were
arranged...until I saw the original MITS 8080 CPU card.  They plunked the chip
on the board...(well, chips, although, there were not that many), and ran the
signals from the circuit to the edge connector, and were ever they ended up,
that was the bus definition...so, sometimes important decisions are left to
somebody who might not even know the difference.

    This is also a reason I decided to stop using the quads.  A pair of duals
uses only just a little more board realestate, but they make the power
distribution a lot cleaner.  If I was willing to use vias for power (and there
really is probably no reason not to at these low frequencies), it would really
be no problem...but it has been drummed into me that you don't run power through
vias...

Grant Richter wrote:

> Here is a question I have ALWAYS wanted to ask.
>
> Why, in a quad op-amp package, is pin 4 positive and pin 11 negative?
>
> Of course in a dual op-amp, pin 8 is positive and pin 4 is negative.
>
> Standard board layout procedure is to have all pin 1 in same orientation.
>
> This means that when routing quad and dual op-amps in a row, you need to
> flip traces and it screws up your bypass cap layout.
>
> There must be a good reason for all the troubles it's caused. Please ask the
> old guys for me.
>
> Thank you!
>
> > I'm at ADI in the precision op-amp product line
> > (basically PMI). We're still doing a lot of bipolar
> > but also a lot of CMOS. The 'older' guys (Derek
> > Bowers/Peter Ohlon/Paul Henneuse) tend to do most of
> > the bipolar amps and us younger ones get the CMOS.
> >

--
 -Jim
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