A 17.6-Bit 800-SPS Energy-Efficient Read-Out IC With Input Impedance Boosting
- Authors
- Park, Junyoung; Kim, Wooyoung; Kim, Daesik; Lee, Dongkeon; Hong, Yongtaek; Kim, Suhwan; Rhee, Jooyeol
- Issue Date
- May-2023
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Keywords
- capacitively-coupled instrumentation amplifier; energy efficiency; gain programmability; impedance boosting; incremental delta-sigma analog-to-digital converter; Pressure sensor; system-level chopping
- Citation
- IEEE Sensors Journal, v.23, no.9, pp.9430 - 9439
- Journal Title
- IEEE Sensors Journal
- Volume
- 23
- Number
- 9
- Start Page
- 9430
- End Page
- 9439
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/88201
- DOI
- 10.1109/jsen.2023.3262682
- ISSN
- 1530-437X
- Abstract
- A 17.6-bit, 800-sample-per-second (SPS) read-out integrated circuit has been implemented for a bridge sensor. The read-out integrated circuit has a capacitively-coupled instrumentation amplifier (CCIA) with a sensor offset voltage compensation circuit, an amplifier offset voltage compensation circuit, and an input impedance boosting loop (IBL). Followed by the CCIA, a programmable-gain third-order discrete-time incremental delta-sigma (ΔΣ) analog-to-digital converter (ADC) with an output data-rate of 12.8 kHz shortens the sensing time to reduce the static power consumption of the resistive bridge sensor and the read-out IC. To boost the input impedance of the CCIA, the system-level input and output choppers operate at a frequency of 12.8 kHz. The ΔΣ modulator converts the modulated signal to digital with a sampling clock of 4 MHz. The system-level chopping reduces the residual offset and the low-frequency noise with an on-chip cascade of integrators (CoI) filter. Implemented in a 0.13 μm CMOS process, the read-out circuit achieves an input impedance of 22 MΩ at a data-rate of 800 SPS, a sensor offset compensation range of ± 350 mV, a maximum effective resolution of 17.6 bits, and an input-referred noise of 1.72 μVRMS at a gain of 128. It draws an average current of 106.3 μA from a 3 V supply and 1.3 μA from a 1.5 V supply. IEEE
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