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Biopotential Multi Path Current Feedback Instrumentation Amplifier With Automatic Offset Cancellation Loop For Resistive Bridge Microsensors by Younes Laababid%2c Karim El Khadiri%2c Ahmed Tahiri

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1Biopotential Multi-path Current Feedback Instrumentation Amplifier With Automatic Offset Cancellation Loop For Resistive Bridge Microsensors

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This study introduces a refined current feedback instrumentation amplifier (CFIA) specifically designed for amplifying biopotential signals that originate from resistive-bridge sensors. The proposed architecture uniquely incorporates a multipath chopper-stabilized CFIA which has been developed to minimize the effects of bridge offsets, while maintaining low power usage, high input impedance, and reduced noise characteristics. The engineering blueprint employs a ripple reduction loop (RRL) to mitigate output ripple caused by chopper up-modulation. To speed up offset cancellation and to limit the offset caused by bridge mismatch, an automatic offset cancellation loop (AOCL) circuit is integrated within the analog front end (AFE). Crafted using a conventional 0.18 µm CMOS process, the CFIA in this design provides adjustable gain between 20.35 dB to 55.14 dB, with a power supply rejection ratio (PSRR) and a common mode rejection ratio (CMRR) of 103 dB and 114 dB, respectively. The system demonstrates an input-referred noise (IRN) value of 16 ηV/√Hz at 200 Hz frequency, equivalent to a noise efficiency factor (NEF) of 5.18. Operating from a supply voltage of 1.8V, the AFE shows a power consumption of 291 μW.

“Biopotential Multi-path Current Feedback Instrumentation Amplifier With Automatic Offset Cancellation Loop For Resistive Bridge Microsensors” Metadata:

  • Title: ➤  Biopotential Multi-path Current Feedback Instrumentation Amplifier With Automatic Offset Cancellation Loop For Resistive Bridge Microsensors
  • Author: ➤  
  • Language: English

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The book is available for download in "texts" format, the size of the file-s is: 9.90 Mbs, the file-s for this book were downloaded 30 times, the file-s went public at Wed Jan 24 2024.

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