A Time Based Potentiostat for Wide Dynamic Range Current Measurement

  • 侯 人瑋

Student thesis: Master's Thesis

Abstract

A Time based potentiostat for wide dynamic range current measurement is presented in this thesis We propose a circuit architecture which is well suited for designing a wide dynamic range current-to-time converter and it is able to be used in potentiostat design for different requirements Therefore we provide an efficient way to make trade-offs among all the parameters such as dynamic range sampling frequency resolution power dissipation chip area and so on The proposed design is implemented in UMC 0 18-μm 1P6M CMOS technology Circuit performance is characterized through post-layout simulation showing a wide dynamic input current range of 126 dB (1 nA–2 mA) and the resolution at the minimum current range is smaller than 10 pA The sampling frequency of the circuit is 1 kHz and the minimum power dissipation is only 12 μW Circuit performances are able to meet the requirements of different kinds of biosensors The measurement results of the first version of the chip match with the simulation results It demonstrates that the feasibility of the proposed method and circuit is good
Date of Award2015 Sep 3
Original languageEnglish
SupervisorBin-Da Liu (Supervisor)

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