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A 7ms Speed Automatic Driving Current Signal Cancellation Technique for Bio-Impedance Measurement

A bioelectrical impedance measurement circuit with a high speed automatic driving current signal (carrier) cancellation technique is proposed. The carrier cancellation has a partial enlargement effect of impedance. A partial enlargement enables a wide dynamic range and relaxes noise specification in analog readout channel and ADC. In my previous work, a manual method of carrier cancellation was introduced, and in this paper an automatic version is proposed. Automatic carrier cancellation time is important in electrical impedance tomography applications, because as many measurements are needed as the number of electrode combination. The designed circuit was implemented using CMOS 180-nm process technology. The processing time of the newly proposed automatic carrier cancellation technique was measured to be 7ms, which is about 1000 times better than the previous one.