What is it about?
Low-cost background calibration scheme of bandgap which uses chopping technique and IIR filter. A chopper is located at both of input and output of op amp, and the offset voltage of op amp is dithered at the output of op amp. Since the average value of dithered output voltage of op amp is offset-free bias voltage for PMOS current source, IIR filter is inserted to get the offset-free bias voltage.
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Why is it important?
The proposed scheme achieves decent improvement without using trimming which is done with an additional process step. The proposed calibration operates in background, so it adapts to supply-voltage variations.
Perspectives
Even though there are several techniques for calibration of bandgap reference circuit, most of them utilize a trimming or something like that which requires additional process step or other cost-requiring steps. However, this work proposes a background calibration with decent performance improvement. Hence, it is appropriate for low-cost application.
Prof. Ji-Yong Um
Hannam University
Read the Original
This page is a summary of: Calibration of bandgap voltage reference using chopping technique and IIR filter, Electronics Letters, June 2016, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/el.2016.1267.
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