Patent ID: 9329215
Filing Date: 2016-05-03
CPC Classification: G01R

Claim Text:
1. An impedance measurement apparatus configured to measure an impedance of a detection target, the impedance measurement apparatus comprising: a measurement auxiliary circuit configured to form a resonance circuit together with the detection target; an automatic tuning assist circuit coupled with the resonance circuit, and comprising (i) a first terminal and a second terminal, (ii) N (N represents an integer) auxiliary capacitors, (iii) a plurality of switches, each of which is arranged between two terminals from among the first terminal, the second terminal, and terminals of the N auxiliary capacitors, and (iv) a controller configured to respectively switch each of the plurality of switches; a signal generator configured to apply an AC probe signal to the resonance circuit; and an impedance detection unit configured to measure a voltage at least one node and/or a current that flows through at least one current path after the impedance measurement apparatus enters a stable state, and to detect the impedance of the detection target based on the measurement value.