An alternate voltage-controlled current source for electrical impedance tomography applications
The desirable features of any current source in electrical impedance tomography (EIT) are high output impedance and a constant current for varying loads. Howland current sources are the most popular current sources for EIT applications. Alternately, a simple non-inverting amplifier circuit can be us...
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my.uniten.dspace-250282023-05-29T15:30:38Z An alternate voltage-controlled current source for electrical impedance tomography applications Chitturi V. Farrukh N. 56938688700 56272534200 The desirable features of any current source in electrical impedance tomography (EIT) are high output impedance and a constant current for varying loads. Howland current sources are the most popular current sources for EIT applications. Alternately, a simple non-inverting amplifier circuit can be used as a voltage-controlled current source using IC LM7171 op-amp. A constant current of 5 mA (PP) is designed and tested over a wide range of frequencies. The frequency response indicates a stable current up to 1 MHz. These results are validated for an impedance of 1 k? which is usually considered for EIT applications. A buffer circuit is added to this current circuit to meet high output impedance matching. A minor discrepancy is visible between the theoretical value and measured value of the output current due to the tolerance band of the resistors used in the non-inverting amplifier circuit. � Springer Nature Singapore Pte Ltd 2019. Final 2023-05-29T07:30:38Z 2023-05-29T07:30:38Z 2019 Book Chapter 10.1007/978-981-13-2514-4_8 2-s2.0-85063228257 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063228257&doi=10.1007%2f978-981-13-2514-4_8&partnerID=40&md5=3769158ba2be30eb927c74b572968efa https://irepository.uniten.edu.my/handle/123456789/25028 43 93 102 Springer Scopus |
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The desirable features of any current source in electrical impedance tomography (EIT) are high output impedance and a constant current for varying loads. Howland current sources are the most popular current sources for EIT applications. Alternately, a simple non-inverting amplifier circuit can be used as a voltage-controlled current source using IC LM7171 op-amp. A constant current of 5 mA (PP) is designed and tested over a wide range of frequencies. The frequency response indicates a stable current up to 1 MHz. These results are validated for an impedance of 1 k? which is usually considered for EIT applications. A buffer circuit is added to this current circuit to meet high output impedance matching. A minor discrepancy is visible between the theoretical value and measured value of the output current due to the tolerance band of the resistors used in the non-inverting amplifier circuit. � Springer Nature Singapore Pte Ltd 2019. |
| author2 |
56938688700 |
| author_facet |
56938688700 Chitturi V. Farrukh N. |
| format |
Book Chapter |
| author |
Chitturi V. Farrukh N. |
| spellingShingle |
Chitturi V. Farrukh N. An alternate voltage-controlled current source for electrical impedance tomography applications |
| author_sort |
Chitturi V. |
| title |
An alternate voltage-controlled current source for electrical impedance tomography applications |
| title_short |
An alternate voltage-controlled current source for electrical impedance tomography applications |
| title_full |
An alternate voltage-controlled current source for electrical impedance tomography applications |
| title_fullStr |
An alternate voltage-controlled current source for electrical impedance tomography applications |
| title_full_unstemmed |
An alternate voltage-controlled current source for electrical impedance tomography applications |
| title_sort |
alternate voltage-controlled current source for electrical impedance tomography applications |
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Springer |
| publishDate |
2023 |
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1806426043151548416 |
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13.250246 |