The current source circuit is one of the most important parts in the bioelectrical impedance devices and Bio Impedance tomography (BIT). There are many types of these circuits like (Howland, one op-amp, two op-amps, etc). In this study three types of electronic circuits are built and tested by using "Tina 7" simulation software from Texas Instrument (TI). THS4022 high speed Dual op-amps from Texas Instruments (TI) are used. The results showed that Howland circuit and one op-amp circuit are very stable up to the frequencies of 10 MHz, better than the two op-amp circuit. The two op-amp circuit is good for low frequencies with 10 KHz maximum frequency.
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机译：电流源电路是生物电阻抗设备和生物阻抗层析成像（BIT）中最重要的部分之一。这些电路有很多类型，例如（Howland，一个运算放大器，两个运算放大器等）。在这项研究中，使用德州仪器（TI）的“ Tina 7”仿真软件构建并测试了三种类型的电子电路。使用德州仪器（TI）的THS4022高速双运放。结果表明，Howland电路和一个运放电路在10 MHz的频率下都非常稳定，优于两个运放电路。两个运算放大器电路适用于最大频率为10 KHz的低频。
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