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Stunningly consistent complementary differential amp circuitry

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Franki:
I just found a really beautiful and consistent complementary differential amp circuit that I just wanted to share with everyone.

Usually I'm not into spamming people with unrelated circuits, but this one looks just gorrgeous *SteveIrvine*, just look at its delicate yet consistent current mirrors, even these are complementary! ;D

I have no idea whether this circuit actually works, but it would be a pain in the ass if it didn't. On the other hand, there is just one way to find out...

full size
http://www.freepatentsonline.com/6778014-0-large.jpg
here's the link, unfortunately, it's patented, but hopefully, there is a variant in the doc that is prior art:
http://www.freepatentsonline.com/6778014.html
I feel like I need to put that in a simulator somewhen just for the fun of seeing how it works.

Zero999:
The only way to prove it works, is to etch it onto silicon. It won't work when made from discrete components because they won't be matched.

I wonder they have an op-amp based on this design?

scrat:
I agree with Hero, and (although I'm not an integration designer) I think there are many differential stages like this on the ICs we use every day. BTW, I don't see what that inverter on the output stands for...

Franki:

--- Quote from: Hero999 on March 20, 2011, 08:51:39 am ---The only way to prove it works, is to etch it onto silicon. It won't work when made from discrete components because they won't be matched.

--- End quote ---
strictly speaking, you are right, but for testing purposes, one may use a pot to cancel out manufactorung differences.


--- Quote from: Hero999 on March 20, 2011, 08:51:39 am ---I wonder they have an op-amp based on this design?

--- End quote ---
I haven's seen any in ICs.

There are a few power amps using complementary differential circuitries, but I haven't seen any using FETs or MOSFETs for that, they all use bipolar transistors and they only use it in some intermediate stages. Just like this one:

source by some unknown audio hobbyist:
http://www.littlefishbicycles.com/poweramp/

Zero999:
The CA3160 was almost entirely CMOS.
http://www.intersil.com/data/fn/fn976.pdf

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