can negtive feedback reduce the ppm/K of bandgap reference?

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wanily1983

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hi, guys
can negtive feedback reduce the ppm/K of bandgap reference?
with regards
wanily
 

Re: can negtive feedback reduce the ppm/K of bandgap referen

Vref=nVt+Vbe,Temperature Coefficient=ΔVref/ΔT,so i feel the ppm/K of bandgap reference doesn't has relation with negative feedback!
 

Re: can negtive feedback reduce the ppm/K of bandgap referen

The best results are actually achived with a noncurvature corrected bandgap and a temperature sensor built from the same bandgap. The temperature sensor is converting a*VT/VBDG into the digital domain and the temperature correction is done in the digital domain. Correction training is required at 3-5 temperature values but with process dependend presettings a similar performance as laser trimming could be achieved.
 

Re: can negtive feedback reduce the ppm/K of bandgap referen

this is the schematic, it can get 1.5 ppm/K using the standard 0.6u UMC model, but it only has first order compensation. what is impossible!
 

Re: can negtive feedback reduce the ppm/K of bandgap referen

+1

Using the same Bandgap as a temp sensor and putting it into the digital domain and using that as a controller can generate a super accurate bandgap.
 

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