56 research outputs found
Current-excitation based ΔR-to-frequency converter for resistive sensors
This paper presents a relaxation oscillator-based high-resolution resistance measurement system. The proposed signal conditioning circuit utilizes a half-bridge topology with a bidirectional current excitation. The circuit modulates the incremental change in the sensor resistance in the form of a change in the frequency of the relaxation oscillator. The baseline resistance of the sensor is automatically compensated using a digital potentiometer at the beginning of the measurement cycle. The proposed circuit is analyzed in detail by considering the non-idealities of the circuit components. The design consideration is provided for different components. A prototype PCB of the proposed circuit is developed. The results show that the proposed circuit can provide a signal-to-noise ratio of 80 dB for a wide-range incremental change in the sensor resistance up to 500 kΩ with an error of less than ± 1%. The developed board is tested with humidity sensors. The result confirms the efficacy of the proposed circuit for a wide measurement range
A Generic Power Management Circuit for Energy Harvesters With Shared Components Between the MPPT and Regulator
Design of A Novel Highly EMI-Immune CMOS Miller OpAmp Considering Channel Length Modulation
Part II: A Novel Scheme to Optimize the Mixed-Signal Performance and Hot-carrier Reliability of Drain-Extended MOS Devices
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