Bio-impedance measurement using voltage to current conversion

A method comprising:

• receiving a bio-impedance signal, from two electrodes coupled to a human body, at an input stage,
• wherein the bio-impedance signal is an oscillating voltage;
• determining an alternating current of the bio-impedance signal based upon a known resistance that is coupled across the two electrodes;
• amplifying the alternating current using a gain stage circuit;
• converting the amplified alternating current to a direct current bio-impedance signal using a down converter coupled to the gain stage circuit;
• and
• converting the direct current bio-impedance signal to a digital bio-impedance signal using an analog-to-digital converter;
• wherein the digital bio-impedance signal corresponds to a health parameter of the human body.

A health monitor system comprising:

• an input stage configured to receive a bio-impedance signal having an oscillating voltage from two electrodes, the electrodes configured to be coupled to a body;
• a resistance across the two electrodes configured to determine an alternating current of the bio-impedance signal;
• a gain stage coupled to the resistance configured to amplify the alternating current;
• a down converter coupled to the gain stage configured to convert the amplified alternating current to a direct current bio-impedance signal;
• an analog-to-digital converter coupled to the down converter configured to convert the direct current bio-impedance signal to a digital bio-impedance signal;
• and
• a radio frequency system configured to send the digital bio-impedance signal to external components.