[sdiy] VCLFO core circuit..

[ASSI]

On Thursday 08 March 2012, 09:42:59, Harry Bissell wrote:
> I honestly don't know if a monolythic NPN/PNP pair has the inherent
> matching.

No, that's not really possible.  The base-emitter junction of the pnp and 
the npn would have to be one and the same diode (just reversed) for 
matching, but for a useful bipolar transistor you want the emitter doping to 
be much higher than the base.  So you can make two types of transistors that 
_really_ suck and have matched Vbe or two that work well (at least the npn), 
but don't match.  What they do have going is excellent thermal coupling.  If 
you can throw enough transistors at it, you could however use a handful of 
matched npn and pnp to develop an offset voltage that precisely cancels the 
mismatch.


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

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