Component tolerances and mismatches due to process variations severely degrade the performance of bandgap reference circuits.Based on device mismatch models,a current reference Iref with adjustable output current from 15 μA to 80 μA is designed.A compensated circuit is used to reduce the temperature drift.To achieve more accurate current reference,an 8 bit bi-directional trimming array with 127 current levels is proposed.This digitally programmable array is binary weighted for accuracy and flexibility.Simul...
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