[sdiy] SSM2164 Filter Cells

[Neil Johnson]

Hi,

HOSHUYAMA wrote: 
> 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.

Oh, I wouldn't call it 'essential', but as I explained in an earlier email the highest value load resistor you could reasonably put on the 2164 output to stay within the output compliance is around 300 ohms, and then the voltage across that resistor would need significant amplification, adding noise and distortion when there is no need.

So not 'essential', but perhaps 'dumb'.

Neil
--
http://www.njohnson.co.uk