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a question about bandgap testing results,thx!

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lotoy

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Hi,
In lab, i have tested the chip with an bandgap, but the results confused me. when power supply ramps up, the output of bandgap will go down gradually.and this issue only happens when ADC begins to work. In only bandgap working mode,bandgap output is constant with power supply ramping up.
I don`t know why, pls give me some advice!
thank you in advance!
 

stoned

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what about your BGR load with ADC?
 

lotoy

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stoned said:
what about your BGR load with ADC?
The load of BGR is a swithed cap, about 2MHz. In my simulation, vref has enough time to settle in one cycle, so there is little droop. However, the droop has any relationship with Power ramping up?

pls give me furter suggestion! thanks!
 

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