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

Claim 7:
8. The method of claim 3, wherein:
aa) includes generating an alternating voltage (Vin) as the first signal using a variable frequency oscillator, an output of the variable frequency oscillator being coupled to an inductance (L) that is in series with the capacitor, the variable frequency oscillator being configured to scan a frequency range including a resonant frequency (fo=ωo/2π) of the capacitor and the inductance;
cc) includes using the measured filtered signal to determine the resonant frequency; and
dd) includes converting the measured filtered signal to the measured capacitance value (C) based in part on the resonant frequency (fo=ωo/2π) and the inductance (L), where fo=ωo/2π=1/2π sqrt(LC).