razavi bandgap references

[gilbertomaldito]

can someone help me how to produce multiple vref from Razavis bandgap reference? (the most basic one bg studied).... I am having hard time producing these vrefs. but when I used the bit complicated one, i was able to produce them.

My process is 10v input, which i need to have 750mv, 4v, 5v and 7.2 v vreferences.

please guide me.

-cute

 

[dick_freebird]

If you don't need low output impedance then a properly
designed resistor ladder from output to ground, with one tap
at the "magic" feedback voltage returned to the bandgap
error amplifier input, would do it. Other taps at your discretion,
perhaps buffered

 

[gilbertomaldito]

hi d***-freeb**d,
with Razavi's Fig 11.9 Bandgap, can I do resistor ladder from output to ground? Have u done this before? or can u share your reference about this?

I tried to use Razavi's Fig 11.39, and I did the resistor ladder, and it was a success. But my professor kept on insisting me to use the Fig 11.9 Bandgap. But I just dont know if it is proper to do resistor ladder to that circuit.

Please explain, I need your inputs.