about bandgap reference voltage

[meliza.capino]

how to adjust the magnitude of the bandgap reference voltage? can an op amp alter its magnitude?

 

[prestonee]

what do you wish to change it to?
changing the voltage is easy, doing so without affecting its temperature profile is a bit tougher.
the easiest way is to generate a bandgap current and run it through whatever resistor load you want(modifying the voltage in the process)

 

[jamaleddin mollasalmani]

Hi Meliza,

Well adjusting the amplitude of ur bandgap reference depends on the type of ur reference.
If it is in a type that it first sums PTAT and CTAT current and then conducting this current through a resistor to generate voltage with low TC, in this way u have to change just the resistor to adjust ur final voltage(assume that resistor doen not have temperature dependancy).

 

[prestonee]

And that assumption is why it is tough to adjust the voltage without degrading the temperature performance.