Abstract
**Please read the paper on the following link:** https://ieeexplore.ieee.org/document/9183905 **Abstract:** This letter presents a compact buffer-less 12-bit output SAR-based bridge-to-digital converter. Eliminating the sample-and-hold circuit substantially simplifies the sensor front-end by providing a high impedance input stage. The binary weighted digital-to-analog converter (DAC) is replaced with a switched-capacitor DAC which is driven by an error-feedback modulator. This alleviates mismatch issues and provides area and power savings when used with a Wheatstone bridge as a read-out. The converter has a wide input range of 830 mV making it suitable for gas sensor applications. It is realized in 65-nm CMOS, occupies 0.01 mm2 area, and consumes 6.2 μA with a 45 ms conversion time. It achieves 9.1 ENOB for a DC input and a Walden FoM of 0.65 nJ/conv-step.
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