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Electronics 2015, 4(1), 1-34; doi:10.3390/electronics4010001

Improving Performance and Versatility of Systems Based on Single-Frequency DFT Detectors Such as AD5933

Ampirica LLC, 1196 Philips Court, Santa Clara, CA 95051, USA
Academic Editor: Manuel Quevedo
Received: 26 September 2014 / Accepted: 26 December 2014 / Published: 31 December 2014
(This article belongs to the Special Issue Flexible Electronics)
View Full-Text   |   Download PDF [581 KB, uploaded 8 January 2015]   |  

Abstract

Turning grand concepts such as the Internet of Things (IoT) and Smart Cities into reality requires the development and deployment of a wide variety of computing devices incorporated into the Internet infrastructure. Unsupervised sensing is the cornerstone capability that these devices must have to perform useful functions, while also having low cost of acquisition and ownership, little energy consumption and a small footprint. Impedimetric sensing systems based on the so-called single-frequency DFT detectors possess many of these desirable attributes and are often introduced in remote monitoring and wearable devices. This study presents new methods of improving performance of such detectors. It demonstrates that the main source of systematic errors is the discontinuous test phasor causing the crosstalk between the in-phase and quadrature outputs and the leakage of the input signal. The study derives expressions for these errors as a function of the number of samples and operating frequency, and provides methods for correction. The proposed methods are applied to the operation of a practical device—a network analyzer integrated circuit AD5933—and discussed in detail. These methods achieve complete elimination of leakage errors and expansion of the low limit of the operation frequency range by nearly two decades without additional hardware. View Full-Text
Keywords: fluid; sensor; impedance; corrosion; leakage; calibration; measurement; DDS; DFT; AD5933 fluid; sensor; impedance; corrosion; leakage; calibration; measurement; DDS; DFT; AD5933
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Matsiev, L. Improving Performance and Versatility of Systems Based on Single-Frequency DFT Detectors Such as AD5933. Electronics 2015, 4, 1-34.

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