An oversampling converter for strain gauge transducers

Oversampling converters with digital filters tailored to remove line-frequency interference have recently been introduced to DC measurement. The authors extend the approach to address the problems of low-noise amplification, drift and aging, and interference modulation. The block diagram of the monolithic system is shown. The 1/f noise of the converter is removed through chopper stabilization. Transducer AC excitation and chopper stabilization remove drift components due to thermocouples and amplifier offsets, respectively. Chip performance is summarized.<
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