As shown blw,can i use a differential amplifier as regulator

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tomato

Joined: 31 Oct 2007
Posts: 16

08 Nov 2007 6:56 As shown blw,can i use a differential amplifier as regulator

pls give me some comments~~
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thanks....

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hr_rezaee

Joined: 06 Oct 2004
Posts: 892
Helped: 88
Location: Iran-Mashhad

08 Nov 2007 15:56 As shown blw,can i use a differential amplifier as regulator

Hi
No because as you see in pic, Vout=-Vin.Rf/Rg
so, Vout is function of Vin
in regulator we don't want that Vout be function of Vin.
regards

tomato

Joined: 31 Oct 2007
Posts: 16

09 Nov 2007 2:12 As shown blw,can i use a differential amplifier as regulator

hi~hr_rezaee

If Vref is fixed like Bandgap ref. and then Driving Tr. in Opamp use pass tr. as PMOS.
is it possible?

hr_rezaee

Joined: 06 Oct 2004
Posts: 892
Helped: 88
Location: Iran-Mashhad

09 Nov 2007 7:36 As shown blw,can i use a differential amplifier as regulator

Hi
I can't understand what you say.
but If you use a bandgap as input, this circuit will be just a buffer nor regulator.
regards


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