Generate VDD independent voltage

[bageduke]

I want to generate a reference voltage which is very close to power supply level (say 1.3V supply and reference voltage at 1.1V), but the PSRR is relative high (say 30dB or above). Is there an easy way to do this?

thanks,

 

[safwatonline]

LDO

 

[mvs sarma]

I want to generate a reference voltage which is very close to power supply level (say 1.3V supply and reference voltage at 1.1V), but the PSRR is relative high (say 30dB or above). Is there an easy way to do this?

thanks,

there are constant current sources called Norton diodes.
or you may use Nchannel Jfet with gate terminated and it works like constant current source. now woth a source resistor you can develop the voltage you need.

 

[bageduke]

What is Norton Diodes? Do you have any circuit to show this structure?

 

[mvs sarma]

What is Norton Diodes? Do you have any circuit to show this structure?

Ok I call Voltage ref diodes

a datasheet is appended for example