A high dynamic range analog-front-end IC for electrochemical amperometric and voltammetric sensors |
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| Affiliation: | 1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, PR China;2. Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, PR China;1. INFN Sezione di Roma, Roma, Italy;2. Museo Storico della Fisica e Centro Studi e Ricerche “E. Fermi”, Roma, Italy;3. Laboratori Nazionali di Frascati dell” INFN, Frascati, Italy;4. Dipartimento di Scienze di Base e Applicate per Ingegneria, Sapienza Università di Roma, Roma, Italy;1. Electronics Telecommunication and Computer Dept. ISEL, R. Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal;2. CTS-UNINOVA, Quinta da Torre, Monte da Caparica, 2829-516 Caparica, Portugal;3. DEE-FCT-UNL, Quinta da Torre, Monte da Caparica, 2829-516 Caparica, Portugal;1. College of Communications and Electronics Engineering, Qiqihar University, Heilongjiang 161006, China;2. Computer Center, Qiqihar University, Heilongjiang 161006, China;3. Department of Physics and Materials Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China;2. State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | A wide input range, compliant with electrochemical amperometric and voltammetric sensors analog-front-end (AFE) integrated circuit (IC) is proposed. The AFE employs current integrator (CI) and trans-impedance amplifier (TIA) to deal with the input current in the order of nA and μA separately, achieving the advantage of high dynamic range and high resolution. Input voltage is converted to current through a series of precise resistances, and detected by CI or TIA, which making the input voltage range is not limited by the power supply. An incremental sigma-delta ADC is employed to digitize the transferring signal, reducing the complexity and power dissipation. Compared to other alternatives, the AFE could handle current and voltage signals simultaneously, and input voltage range is not limited by power supply, showing high dynamic range and resolution. The AFE IC is fabricated in 0.18 μm 1P5M mixed-signal CMOS process, occupies an area of 3.2 mm×2 mm, the readout circuit has a dynamic range of 120 dB, consumes 4.2 mA. |
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| Keywords: | High dynamic Analog-front-end Amperometric and voltammetric Incremental sigma-delta ADC |
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