SIMPLE WIDE FREQUENCY RANGE IMPEDANCE METER BASED ON AD5933 INTEGRATED CIRCUIT
SIMPLE WIDE FREQUENCY RANGE IMPEDANCE METER BASED ON AD5933 INTEGRATED CIRCUIT
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DOI：
10.1515/mms-2015-0006
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发表时间：
2015-03-01
影响因子：
1
通讯作者：
Nitsch, Karol
中科院分区：
文献类型：
--
作者：
Chabowski, Konrad;Piasecki, Tomasz;Nitsch, Karol
集成电路AD5933包含完整数字阻抗计的元件，是阻抗测量的理想解决方案。然而，它用于测量范围广泛的阻抗和频率需要一个额外的数字和模拟电路。介绍了一种基于AD5933芯片的简易阻抗测量仪的设计和性能。除AD5933 IC外，它还包括一个带可编程预分频器的时钟发生器、一个基于峰值检波器的激励信号新型直流失调消除器和一个转换比可切换的电流电压转换器。作者提出了一种选择测量频率的简单方法，以最大限度地减少由于DDS发生器中缺乏抗混叠滤波器而导致的频谱泄漏和失真所产生的误差。此外，提出了一种新的AD5933集成电路校准方法。它对AD 5933 IC返回值的自变量中出现的系统误差进行数学补偿。在示例性测量中展示了整个系统的性能。
As it contains elements of complete digital impedance meter, the AD5933 integrated circuit is an interesting solution for impedance measurements. However, its use for measurements in a wide range of impedances and frequencies requires an additional digital and analogue circuitry. This paper presents the design and performance of a simple impedance meter based on the AD5933 IC. Apart from the AD5933 IC it consists of a clock generator with a programmable prescaler, a novel DC offset canceller for the excitation signal based on peak detectors and a current to voltage converter with switchable conversion ratios. The authors proposed a simple method for choosing the measurement frequency to minimalize errors resulting from the spectral leakage and distortion caused by a lack of an anti-aliasing filter in the DDS generator. Additionally, a novel method for the AD5933 IC calibration was proposed. It consists in a mathematical compensation of the systematic error occurring in the argument of the value returned from the AD5933 IC as a result. The performance of the whole system is demonstrated in an exemplary measurement.