Patent ID: 11881381
Assignee: LAM RESEARCH CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  C  G | IPC C  G  H

Claim 10:
11. The method of claim 3, wherein:
aa) includes generating an alternating current (Iin) as the first signal at the first frequency (ω) at a first terminal of the capacitor using a current source, an output of the current source being coupled to a voltage measurement interface for measuring a voltage (V);
cc) includes measuring as the measured filtered signal a filtered current (I) corresponding to a current at a second terminal of the capacitor; and
dd) includes converting the measured filtered signal to the measured capacitance value (C) based in part on the filtered current (I) and a rate of change of the measured voltage at the voltage measurement interface (dV/dt), where I=C dV/dt.