[time-nuts] 5>10 doubler
csteinmetz at yandex.com
Wed Jan 28 23:06:00 EST 2015
I had forgotten about one quite promising candidate -- the THAT300
matched monolithic quad. I have some of those, too. I'll put it on
the to-do list. To the best of my knowledge, they do not have
reverse protection diodes across the B-E junctions (I've never had
any reason to check).
>>>Once upon a time, Motorola made monolithic quad BJTs -- but I'm
>>>not aware of any matched quads similar to 2N2222s at this time.
>>There still are
>>if duals are enough:
>>also mat02, mat03, maybe SSM2110 [probably meant SSM2210? also,
>>there is SSM2212]
>I had thought of these, but unfortunately, all of the AD parts (MAT
>and SSM) -- which otherwise look promising -- have reverse diodes
>across the B-E junctions, which rules them out as diode substitutes.
>The HFA parts are small-geometry, ultra-high frequency devices (Ft =
>8GHz for the NPNs), not at all like 2N2222s. It is doubtful they
>would have the low flicker noise of 2222s. They are monolithic, so
>they should be pretty well matched, but only the differential pair
>in the 3046 is actually specified for matching -- and you couldn't
>use both of the diff pair in a ring structure because of the common
>cathodes. The 3127 would be the part to try. I have some, so maybe
>I'll try them (but I'm not hopeful).
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