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

On 25 May 2005 10:59:18 -0700, the renowned "Bo-Ming Tong"
<cyberstudio@xxxxxxx> wrote:

>Thanks. That's an excellent idea !
>
>The only potential pitfall I see is that my power could be turned off
>(hence turning off the opamp) but the reference voltage (the circuit I
>am interfacing to) is still on. Then I will be applying a voltage much
>higher than Vdd to the opamp.

You can put series resistance in there to limit the current. One thing
you should be careful of if you try this is that most op-amps will
happily oscillate away when connected directly in a unity-gain
configuration to typical power supply bypass capacitors, so you need
to decouple the op-amp output from any serious capacitive loading (and
make sure that your compensation doesn't allow it to overshoot too
much).


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
.

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