What is bandgap reference generator and why do we need it in the circuit?

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Can you please explain it -
What is bandgap reference generator and why do we need it in the circuit?
 

VLSI_Learner said:
What is bandgap reference generator
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As google can tell you, it is a fixed voltage reference that does not vary significantly with temperature. Usually about 1.25V.

**broken link removed**

VLSI_Learner said:
why do we need it in the circuit?
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Which circuit? Anywhere that an accurate and stable voltage (or current) reference is required.
 

In short it is simply a stable voltage source that is temperature independent.
Right?

- - - Updated - - -

In short it is simply a stable voltage source that is temperature independent.
Right?
 

Yes, that's what I said. The link explains how it works if you are interested to know that.
 

What is its difference with normal voltage source?
Is it only bandgap reference generator's stability and temperature independence?
And I guess bandgap reference generator is needed for critical devices, switches, and the devices which need matching. Right?
 

BGR are mostly built into the IC.The BGR functions in such a way that it accounts for the change in temperature of the chip and the voltage from the BGR remains constant inspite the change in temperature .Here when u tell voltage source ,do you mean external voltage source ???
 

Actually I was reading Razavi's book and there I am finding some problem understanding this. Please make me understand using some examples.

 

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