636 / 2019-03-19 20:33:11

High-Precision Bandgap Reference Voltage Generation Method With Chopper Stabilization Technique

Bandgap reference, low-noise bandgap, bias generator, chopping

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A Three-level chopping technique to reduce offset caused by mismatch of the Wilson Current-mirror and PNP Bipolar transistor is described and presented. Input referred offset voltage of the PNP transistor is reduced on first level. On second level, Wilson Current-mirror offset is further reduced along with the low-frequency 1/f noise caused by the self-biased circuit. The last level is used to reduce offset of self-biased circuit two. The proposed BGR was simulated in a temperature range from -45ºC and +125ºC. Simulate results showed that the standard deviation of the BGR output voltage without chopping is 9 times higher than that of when chopping is enabled. The proposed three-level chopping technique is verified improving performance characteristics of conventional BGR circuit. The maximum supply current is 36uA and the area of layout is 0.085mm2 with a standard 0.13µm 1P4M CMOS process.