A high dynamic range analog-front-end IC for electrochemical amperometric and voltammetric sensors
The AFE IC present in this manuscript employs dual-path, current integrator (CI) and trans-impedance amplifier (TIA), to deal with the input current in the order of nA and ?A separately, achieving the advantage of high dynamic range and high resolution. The AFE IC can be compliant with both electrochemical amperometric and voltammetric sensors, instead of traditional instrument amplifier, a voltage-to-current circuit is adopted to convert an input voltage to a current, making the input voltage range is not limited by the power supply. Instead of a traditional sigma-delta ADC, a incremental sigma-delta ADC is employed to digitize the transferring signal, reducing the complexity and power dissipation, providing the feature of one-to-one mapping between input and output.
high dynamic analog-front-end amperometric and voltammetric incremental sigma-delta adc