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This paper presents a direct digital converter for Wheatstone bridge sensors, which is realized with commercial off-the-shelf components. The power efficiency of the readout is enhanced by embedding the bridge sensor in a second-order continuous-time sigma-delta modulator (${\mathrm{ CT}}\Delta \Sigma {\mathrm{ M}}$ ). By directly digitizing the output signal of a Wheatstone bridge in the current...
This paper describes a low power and low noise circuit for resistive Wheatstone bridge sensor readout. The proposed readout exploits the bridge configuration of the sensor by embedding it into a second-order continuous-time sigma delta modulator (RC CTΔΣM). By directly digitizing the output signal of a Wheatstone bridge in the current mode, the noise performance is dominated by the operational transconductance...
This paper presents the most energy-efficient CMOS temperature sensor ever reported, with a resolution FoM of 49fJ K2, 2.7× better than the state-of-the-art. It consists of a Wheatstone bridge made from poly-silicon resistors, which is readout by a 2nd-order Continuous-Time Delta-Sigma modulator (CTDSM). This approach leads to a high resolution (160μΚ in 10ms) and a low supply-voltage sensitivity...
Wheatstone bridge sensors are often used in precision instrumentation and measurement systems, e.g., for μK-resolution temperature sensing in wafer steppers [1] and mPa-resolution differential pressure sensing in precision air gauges [2]. Since they output small differential signals superimposed on a large common-mode (CM) voltage, typical bridge readout ICs (ROICs) consist of an instrumentation amplifier...
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