Voltage Controlled Current Source with Reduced Stray Capacitances Effect and Extended Impedance and Frequency Ranges
Hanen Nouri
Broschiertes Buch

Voltage Controlled Current Source with Reduced Stray Capacitances Effect and Extended Impedance and Frequency Ranges

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Bioimpedance spectroscopy is a non-invasive measurement technique in medical applications. It requires low amplitude current excitation to maintain safety. Designing a current source for this purpose is a challenge as it needs to maintain a stable and safe excitation current, below 0.5 mA, independent of the impedance and frequency.Various topologies of voltage controlled current sources exist in the literature, where the Enhanced Howland Current Source (EHCS) and the Dual HCS (DHCS) show advantages concerning low output current deviation and high output impedance.They are composed of operatio...