Texas Instruments Corporation

Prabin Krishna Yadav

Anand Hariraj Udupa

Sandeep Kesrimal Oswal

Jagannathan Venkataraman

Aravind Miriyala

Raja Reddy Patukuri

Aatish Chandak

Hussam Ahmed

Kiran Rajmohan

Anand Reghunathan

Midhun Raveendran

An example apparatus includes: calibration circuitry configured to determine a second current at a second terminal of a second impedance circuit based on a first parasitic capacitance, a first impedance value, a third impedance value, a first voltage, and a second voltage; determine a third voltage at a second terminal of a second impedance circuit based on the first parasitic capacitance, a second impedance value, the third impedance value, the second voltage, and the second current; and determine a second parasitic capacitance between the second terminal of the second impedance circuit and the second terminal of a fifth impedance circuit based on the second current, the third voltage, a third current at the second terminal of the fifth impedance circuit, and a fourth voltage at the second terminal of the fifth impedance circuit.

Methods and apparatus for determining parasitic capacitances

A system may comprise: an excitation current source; a first electrode coupled to the excitation current source; and a second electrode coupled to the excitation current source. The first and second electrodes may be configured to pass an excitation current from the excitation current source through a human body. First and second calibration resistors may be coupled to and positioned between the excitation current source and the first electrode. Third and fourth calibration resistors may be coupled to and positioned between the excitation current source and the second electrode. The system may also comprise a sensor configured to measure voltages across each of the first, second, third, and fourth calibration resistors.

Calibrating body impedance measurement systems

Growing community of inventors

Bengaluru, India

Prabin Krishna Yadav