"No Tail Pair" amplifier configuration?

No idea, possibly a complementary diff pair? Emitters together, bases input, collectors have balanced current by Kirchoff's rule. Not really differential though...

Tim

-- Two pieces of cheese the same size and shape are con-gruyere-ent. Website:

ISTR an audio preamp design with an input stage consisting of NPN/PNP pairs with the emitter of each NPN connected to emitter of PNP, with appropriate biassing. That might be referred to as a "no tail pair", as there are no "long tail" current sources. I think the alleged concept was to do with symmetry.

Regards Ian

You must be talking about the 741.....

DNA

You can't find any tail ?:-)

...Jim Thompson

There's also the "long tail no-pair" (which I just made up) where the right-side transistor of a diff pair is replaced by a diode to ground.

Or the French version, the au pair.

John

Sno-o-o-ort!

I just heard a political analysis that said a Muslim-occupied France would be easier to cope with than a duplicitous-Chirac-dominated France ;-)

...Jim Thompson

Been samplin' the cookin' sherry there, John? ;-P

Cheers! Rich

Hi Tim,

I found out.. It is that patent, and I'm unfortunately under an NDA, so I can't say anything more.

I can say this: I breadboarded it and it kicks some serious ass. Open loop performance is excellent.

Why are you under an NDA? The patent is public domain and has to give sufficient information for one skilled in the art to replicate it. You can download the patent from the US patent office including the circuit diagrams.

Anyone who is interested can do a Google search like I did and find the patent then download it.

Ian Ian

And further to my other reply, the US patent number is 6,781,459, check it out at the patent office. Note I can find no evidence of a European or world patent.

Ian

Because the circuit was given to me by the author of the patent for the company I am working for to see if we will purchase a license.

And I found out the day after I asked here about what it was, and went, basically, full circle back to source of the patent in person by my boss.

Nothing to see here, move along.

So I go in the next day and I tell the boss there's a patent on "no tail" and he says "Yeah, I talked to that guy this morning, here's the circuit from him, test it out"..

Whoop..

Looks mostly like BS to me. I'll analyze it thoroughly when I return from Atlanta... leaving in one hour.

...Jim Thompson

There is no doubt that a Muslim government would waste fewer public francs on wine...

John

Figures 12 and 13 are almost BS, unless one wants to consider class D and the non-linear loading on the input(s). I really like figure 18, where power is derived from the gate of Q2 and atenuated for use at terminal 32. With fiddling, maybe figure 19 circuit could be used for upper, lower sidebands and carrier generation?

What fun..