Patent ID: 9518854
Filing Date: 2016-12-13
CPC Classification: G01F,G01N,G06G,H03K,H03M

Claim Text:
1. A resonance circuit used for a measurement device, configured to receive a pulse density signal obtained by ΔΣ-modulating an analog displacement signal by a ΔΣ modulator and a multi-bit signal obtained from the pulse density signal and to generate an excitation signal based on the pulse density signal and the multi-bit signal, the resonance circuit comprising: an amplification factor controller configured to set an amplification factor depending on a vibration signal obtained from the multi-bit signal; a multiplier configured to amplify a level of the pulse density signal by the amplification factor; and a circuit group configured to generate the excitation signal based on a pulse density signal obtained by further ΔΣ-modulating an output of the multiplier; wherein the amplification factor controller is configured to set the amplification factor using a proportional control and an integral control based a difference between an amplitude signal obtained from the vibration signal and a target amplitude value.