Capacitive sensor

Details Capacitive sensor Capacitive sensor

2006-10-10

2006-10-10

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S681000, C331S03600C, C331S065000

Reexamination Certificate

active

07119551

ABSTRACT:
An improved two loop capacitive sensor oscillator circuit converts a transducer capacitance to a frequency and includes a first loop to create an oscillatory waveform having a frequency related to a capacitance of the capacitive transducer. The first loop includes a resistor. The resistor is electrically coupled to a capacitor. The resistor is also electrically coupled to the capacitive transducer. The capacitive transducer is electrically coupled to an input of a first inverter gate. A second loop oscillates at the frequency of the first loop and further generates a second waveform of a substantially square wave shape at the same frequency. The second loop is electrically coupled to the first loop and the output of a third inverter gate is substantially a square wave at the frequency related to the capacitance of the capacitive transducer.

REFERENCES:
patent: 4679032 (1987-07-01), Roschier
patent: 4806783 (1989-02-01), Anderson
patent: 4920322 (1990-04-01), Ruijs
patent: 4987389 (1991-01-01), Brosh et al.
patent: 5136262 (1992-08-01), Spencer
patent: 5929677 (1999-07-01), Murata

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