Re: Pls help me find extremely small 1:1 voltage-tracking regulator

Yes, thanks for the advice...

I am rethinking this a bit due to the advice of you and Walter. The
reason why I wanted my power supply to track the other power supply is
that I am afraid of the I/O pin protection clamp diode conducting (on
either side), blowing things up. But as I think about it, using a
high-current rail-to-rail opamp leads me back to exactly the same
original problem that I am trying to solve. I am just dealing with a
protection diode in a different place. And on top of that I need to
worry about output capacitance like you said.

As you can see I have about 0.3V voltage difference between the 2 power
supplies. I guess I can just add 10k resistors to each pin of the
interface. If the power supply differences turns out to be great enough
to trip the protection diodes (in the normal case this should not
happen), the protection resistors should be able to limit the current
and saving me from blowing things up.

Is there going to be any problem if I interface two CMOS logic systems
together with a constant Vcc difference of 0.3V ? I wish the design to
be both durable and reliable. I think the durable part has been
addressed by protection resistors, but I am not so sure about the
reliable part. I had the pleasure (sarcastic) to deal with an alarm in
my car where the control signals would get mixed up, such as the door
lock control crossing over to the siren, when the not-so-well-designed
zener diode protection circuit to the ULN2003 driver IC kicks in. And
because of this lesson I don't want my own product to act crazy under
any situation.

Thanks again to the advice.

.

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