ic_engr
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Okay.
The problem with BG circuits is that unless you have a proper start-up circuit, IC may not gurantee a proper star-up, unless the circuit noise itself is large enough to start the BG. But the BG you have is known to be hard to start-up, I refer you to Banba's paper.
First, you should try having a start-up circuit where the circuit will pull down the gates of PMOS switches, until the outptu is stabilized, and then use the output to shut-off the BG circuit.
ic_engr
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