Voltage Reference Circuit vs. Voltage Regulator

[chickenvlsi]

voltage reference vs voltage regulator

Hi All,
Could you pleas let me know the difference between voltage regulator and voltage reference circuits?
As I understand, reference voltage circuit aims to provide a voltage which is not dependent on PVT variations. And the purpose of voltage regulator is to provide a voltage which is constant regardless of power supply variation. Thus, it seems to me that voltage regulator is just kind a subset of voltage reference circuit. Is that right ?
Why does we need a voltage regulator while we can have fixed voltage with reference circuit?
I'm looking forward to hearing from you.
Thanks.

 

[BABESH]

voltage regulator reference

Hi
Reference circuits cannot maintain ref voltage for larger load conditions.
where as regulators can...

--babesh

 

[onteri]

voltage reference circuit

The main difference as mentioned above is the load current capability. References deliver very small load currents (less than 2mA) while regulators deliver up to amperes of current.

 

[chickenvlsi]

voltage reference circuits

The main difference as mentioned above is the load current capability. References deliver very small load currents (less than 2mA) while regulators deliver up to amperes of current.

Hi Onteri,
Thank you for you reply.
Now, It's clear to me why we need a regulator.
However, It seems to me that regulator's ouput voltage is varied with temperature change because threshold voltage and carrrier mobility of pass transistor in a typical regular is depedent on temperature. Is that right?

I think it's best if we can design a reference which is independent on both PVT and load current variation, then we don't need to use regulator anymore. Is that right?
Thanks

Added after 1 minutes:

Hi Babesh,
Thank so much for your reply.
Btw, Could you please help me with my above reply?