[sdiy] Discrete OTA

[Roman Sowa]

After all, the bunch of current mirrors and differential pairs packed
into 2164's four VCAs was called by Analog Devices "the Gilbert cell".
As well as in few other chips in this family.
It is nice that the ADI honors his employee that way. Well I assume the
big bucks came also without asking.
OTOH if tempco compensation was patented by ADI in 83, I wonder why it
didn't end up in some high-end 2164 version. Guess the potential sale of
such chip would not be counted in milions...

Anyway, thank you all for the hugs and recognition. I was off list for
years so may not be aware if that was discussed before.
It gives me strength to search for new solutions. Actually I have few
new ideas, but let me try them first, and most of all, try to find out
if it wasn't done so far.

getting back to work now...

Roman

W dniu 2014-04-08 02:45, houshu at muj.biglobe.ne.jp pisze:
> Hello List,
> 
> I agree that Roman is the inventor as for the SSM2164 based schematic.
> 
> Actually, the same principle was invented by Barrie Gilbert in 1983.
> 
>    Temperature compensated logarithmic circuit US 4604532 A
>     http://www.google.com/patents/US4604532?hl=ja&dq=4,454,433
> 
> I think we should proud our re-invention of the same idea by Barrie.
> 
> Best,
> 
> Sam HOSHUYAMA
> Saitama, JAPAN
> 
> ----- Original Message -----
> From: "Ian Fritz" <ijfritz at comcast.net>
> To: "Phil Macphail" <phil.macphail at liivatera.com>, "Roman Sowa" <modular at go2.pl>
> Cc: synth-diy at dropmix.xs4all.nl
> Sent: Tuesday, April 8, 2014 03:07:33
> Subject: Re: [sdiy] Discrete OTA
> 
> At 03:16 AM 4/7/2014, Phil Macphail wrote:
>> If I has incorrectly attributed the design to the wrong person then I
>> apologise, but after a bit of looking around Google turns-up this on
>> Neil's website -
>> http://www.milton.arachsys.com/nj71/misc/0drift.html
>>
>> which is dated 30th August, and the Osamu website has this page -
>> http://userdisk.webry.biglobe.ne.jp/000/024/65/N000/000/000/125151002153016326829_Exp_SSM0908.PNG
>> Claiming to have breadboarded the design on 28th August.
>>
>> So without further investigation it looks like great minds really do think
>> alike!
> 
> Not quite following you here.  The dates are ten years apart.  Clearly
> Romans invention!
> 
> Ian
> 
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