Complementary Reference Supply Help

The usual way is to employ a pair of linear voltage regulators, like LM317L or LT1120 and a negative equivalent, with resistors to set the reference ratio and capacitors to suit. The 50 mA requirement (I'm assuming it isn't a constant 50 mA, but a range of zero to 50 mA) is a bit stiff for a simple op amp, you'll benefit from heatsinking and a good thermal design.

If there are knowable noise, aging, accuracy requirements, it might be possible to examine LOTS of specifications of LDO regulators to come up with some kind of optimum choice.

OldGuy brought next idea :

Reference as in very stable outputs. It is much easier to work a circuit forward for me that to work it backwards so I cannot give a stability right now. Going for reasonable good stability of a realizable reference so I can work it forward into the circuits that will be using the references.

Should have added: The load is constant but may be in the range of a few ma to 50 ma.

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I'd probably use a TCA0372 dual power op amp and an LM329 or LT1021, because I'm generally more concerned about 1/f noise than with temperature drift.

With a 1.3-A op amp, dual tracking is a very reasonable approach.

Cheers

Phil Hobbs

Well the 50mA makes it harder. But I was going to suggest a REF102 10V reference and then opamp inverter for -10. you'll need some more poop after the ref102.

George H.