An impedance spectroscopy system is provided for bio-impedance measurement in which a signal is generated with a broadband frequency spectrum, and an analog injection current is derived from the signal, wherein the analog injection current has a high pass frequency characteristic. An amplifier is used for measuring a voltage in response to the analog injection signal, but also containing biopotential information (e.g., ECG or EEG), from which a bio-impedance spectrum as well as other parameters may be obtained.This system makes use of an injection current with a high pass frequency characteristic so that the injection current increases with frequency. This compensates for the typical bio-impedance behavior so that the signal to noise ratio of the system is more uniform over frequency.
