[sdiy] Discrete OTA

[Dan Snazelle]

i actually was looking into the cost of fabrication this year.

it both seemed within reach (for a group of companies willing to decide on a design and "group-buy" it)

and out of reach ( for a small company like mine)

Sent from my iPhone

> On Apr 1, 2014, at 10:39 AM, "Tom Wiltshire" <tom at electricdruid.net> wrote:
> 
> 
>> On 1 Apr 2014, at 14:38, Neil Johnson <neil.johnson71 at gmail.com> wrote:
>> 
>> Tom Wiltshire wrote:
>>> Two things that'd be high on my list would be lower noise/higher signal level, and buffers that work. Log/Lin CV inputs would be a nice touch.
>> 
>> A properly done 2162 (not the THAT Corp half-attempt) with two
>> 2164-style gain cells, and two audio-grade op-amps, nicely arranged
>> with one OTA+opamp per side in the same 16-pin package.  Now that
>> really would realise a lot of awesome circuits.
> 
> +1 for SSM2164/2162 with op-amps on chip. That'd be grrrreat!!
> 
> Is it possible to integrate circuits at the pre-packaging level? Could you get a load of unpackaged 2164s and a load of op-amps (say, a couple of duals) and then put the three little tiny wafers into one package? The lead wires would link up the power pins of each, and the rest would go straight out to the IC pins.
> Seems to me that if such a thing were possible, it'd be much cheaper than designing custom silicon. Just use existing silicon and stick it in the same lump of plastic.
> 
> T.
> 
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