Cmos Voltage Reference

[ranier]

Hi,

I will make cmos voltage reference without BJT.
( just I should use nmos , pmos and resistor, due to process limitation. )

One concern is temperature dependancy of reference voltage.
From now on , I usually used bandgap reference .

I saw the some papers which were described with cmos voltage reference.

if you have any experiences of cmos voltage reference,
- what is the temperaure coffecient of reference ?
- which structure did you use ?

thank you.

 

[venkateshr]

it could be that they use the sub threshold region of MOSFET where the diode connected mos really behaves like a diode which can be used to generate iptat a and ictat.

 

[cretu]

I've seen some articles about this. Be aware that you will end up with a very big area in the layout if you don't use any bipolars. With the MOS connected as diodes you will have the same -2mV / °C ..so you can expect a variation of 200mV over 100 °C