[sdiy] Using both OTAs in 13700 as one OTA

[Phil Macphail]

> On 04 Feb 2016, at 21:14, Tom Wiltshire <tom at electricdruid.net> wrote:
> 
> So what's the advantage of that arrangement? Seems like the first stage is superfluous.
> 
> Thanks,
> Tom
> 
>> 
The first stage pre-distorts the signal to compensate for the tanh characteristic of the differential pair in the OTA. It extends the operating range and therefore reduces all the things that the 13700 is criticized for - noise, CV leakage etc.

Phil

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