Patent ID: 6016445
Filing Date: 2000-01-18
Classification: A61N

Abstract:
A method for estimating impedance, comprising the steps of:(1) applying a square wave input voltage, V.sub.in (t), across a load impedance to be measured in series with a selected resistance;(2) measuring a resulting output voltage, V.sub.out (t);(3) modeling the load impedance to be measured as a resistance component in series with a capacitance component;(4) estimating a first transfer function between V.sub.in (t) and V.sub.out (t) based on circuit analysis;(5) estimating a second transfer function between V.sub.in (t) and V.sub.out (t) based on a standard autoregressive moving average model; and(6) equating said first and second estimated transfer functions to derive an estimation of the respective resistance and capacitance components of the load impedance.