A High-Precision Current-Mode Bandgap Reference With Low-Frequency Noise/Offset Elimination

This brief presents a low-noise, low-offset bandgap reference for the biomedical electronic systems application. In order to reduce the low-frequency noise and increase the accuracy, the low-frequency noise/offset elimination technique based on current-mode bandgap reference (BGR) is proposed. Besides, this BGR utilizes a proportional to absolute temperature (PTAT) resistor feedback technique to minimize the low-frequency noise and offset from the current mirrors. The proposed BGR is implemented in a 180 nm deep n-well CMOS process occupying an active area of 0.0725 mm 2. The measured results indicate that the BGR outputs 0.6 V voltage and consumes
$69~\mu \text{A}$
current under 1.2 V supply voltage. It can achieve
$3.5~\mu \text{V}$
(rms) noise from 0.1 to 10 Hz and a 0.21% DC accuracy.