[sdiy] SSM2164 Filter Cells

[HOSHUYAMA]

Hello List,

Please see Fig. 23 "Simplified Schematic" in the datasheet of SSM2164.
Transistors at the output stage are almost saturated.
Its output voltage swing is limited to less than 0.3V.
Therefore, connecting to a virtual ground input like inverting integrator 
is essential.

That's the reason I (and Mike Irwin also) struggled to develop an unusual 
all-pass filter topology using 2164s.
( http://houshu.at.webry.info/200602/article_2.html )

Sam HOSHUYAMA
Saitama, JAPAN

Aaron Lanterman wrote:
> 
> On Jul 22, 2009, at 12:07 AM, David G. Dixon wrote:
> 
> > A resistor-to-ground
> > and follower should also work just fine if you don't want to invert,
> 
> I'm not sure about that with the 2164... I do recall reading something  
> on the datasheet about its particular current output wanting to see a  
> virtual ground in order to be happy (not the case with a usual OTA).
> 
> - Aaron
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