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temperature independent bandgap volatage reference

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vijay.roger

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hai all, reference voltage for some values of resistances, and for some proportionate values of width of PMOS (which is @ output of the circuit), increases linearly with temperature , and for some values of resistances and width of output PMOS, reference voltage decreases linearly with temperature. ? to attain @ temp independent ref voltage, without going for trail and error approach,


thank for ur patience,

looking forward for a reply
 

The design of bandgap references is not trial and error. The theory and design is covered in every IC design book.

Keith
 

sir , thank you for ur reply,

i never think of it as trail and error , i have designed the band gap reference circuit in cadence environment, simulation results are as described as above, once showing +ve temp coefficient for some values , for other values showing -ve temp coefficient,
 

sir , i got it, now the circuit is functioning well, it is generating a temp independent reference voltage of 0.7v(0.688v) for temp range between 25 to 35 deg celsius of temp.
 

That doesn't sound like a bandgap reference but still, as long as it is doing what you want ...

Keith
 

how can i correct the "curvature " when plotting voltage reference against temperature
 

As I said earlier, you need to show your circuit and simulation results.

Keith
 

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