Roll your own opamp using logic inverters

[merlinb]

I know a lot of people like to toy with different kinds of opamps and even discrete opamps. So when I saw this intriguing article, I thought I'd post it here!
http://www.edn.com/design/analog/4424461/A-true-op-amp-made-from-inverters

Also:
http://www.edn.com/design/components-and-packaging/4368741/Build-an-op-amp-with-three-discrete-transistors

[Ben N]

Interesting, but that's a lot of real estate for a single opamp.

[samhay]

Interesting, but it uses 8 inverters over 4 chips - why not just use 2 chips, with inverters to spare?

Edit - oh, never mind. The supply pins of two of the chips are not connect to Vcc and Vss.

[amptramp]

The major appeal of CMOS is that it takes little current - unless you decide to operate it as a linear amplifier.  The slew rate is good, the bandwidth is OK, but the rest of the specs are limited.

[Eb7+9]

... but the rest of the specs are limited

therefore, a potential interesting candidate in OD circuits ...
good find,