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Hi, palmeiras,
transfer gate is used as switch. Yes, its on-resistor less than LSB trim resistor.
By the way, another deisgn is that trim is simply by metal fuse with BOA pad, but less trim bit.
Palmaeiras,
my BGR topology is follow. it is only trim R2.
BG output of last circuit after trim like the follow:
if in corner simulation, the TC will show worse.
So I feel difficult to trim for TC when process variation.
Palmaeiras,
your reply is useful for me. Thank you. I think that add more bits for tranditional linear PTAT trimming for better TC will be my next action item.
palmeiras,
thank your reply.
my question is from my old projects last year. after trimming, the accurency of every part is in SPEC, but the TC is different each other.
I know your mean that by adding more trim circuit , it is possible to get every part has accurency (eg. 1%) and 10ppm/C.
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