Abstract
Automatic multifrequency signal generation is essential for a number of practical biomedical applications such as electrical impedance spectroscopy (EIS) and multifrequency electrical impedance tomography (mfEIT). In EIS or mfEIT, the voltage signal is used to apply an electrical signal to the object under study either converting it into a current signal or even applied as a voltage signal itself. The frequency of the signal generated by the function generator or oscillator circuit depends on the values of the electronic components used or the components connected to the function generator IC used. In this paper, a LabVIEW-based resistor–capacitor bank controller (RCBC) has been developed for automatic multifrequency signal generation with a voltage-controlled oscillator (VCO) circuit. The multifrequency signal generation of the VCO is controlled by a resistor–capacitor bank (RCB) connected with a multiplexer board. The RCB is developed with high precision passive components which are switched through the multiplexer board controlled by a LabVIEW-based graphical user interface (GUI). The RCBC is tested for a voltage controlled oscillator (VCO) circuit and found efficiently sweeping the VCO output frequency suitable for EIS and mfEIT applications.
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