Fri May 30 23:46:59 EDT 2014
Current mirror BCV62 (PNP) / BCV61 (NPN)
The BCV62 is the cheapest current mirror I can find @ digikey. $20
for 100, comparable to CA/LM3046. Current mismatch max 30%.
Counterpart BCV61 about 30% more expensive.
These would work as:
- current mirrors for driving OTA from NPN EIDAC
- Straight NPN/PNP EIDAC
Building a PNP EIDAC needs some thought as I'd have to use a
ground-referenced DAC, so the same trick can't be used.
Probably best to avoid that and use a current mirror.