Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1992-05-22
1995-09-19
Swarthout, Brent
Communications: electrical
Continuously variable indicating
With particular transmitter
73724, 324661, 257415, G08C 1910
Patent
active
054519403
ABSTRACT:
The arrangement serves for the processing of sensor signals which are furnished by a capacitive sensor which includes a measuring capacitor having a measuring capacitance influenceable by a physical measured quantity to be determined and at least one reference capacitor having a reference capacitance influenceable in another manner and furnishing a measuring effect dependent on the measuring capacitance and the reference capacitance. The arrangement comprises a signal processing circuit which operates by the principle of quantized charge transport by means of switch-capacitor structures and charge balancing at least in time average and which receives the sensor signals representing the measuring effect and furnishes an output signal corresponding to the measuring effect. The first electrodes of the capacitors of the sensor are at a fixed potential and their second electrodes are connectable for performing the charge transport to the first input of an input operational amplifier, the second input of which lies at a reference potential. The reverse charging of the capacitors of the sensor necessary for forming the transported charge packets is effected by switching over the reference potential of the input operational amplifier. This permits a one-sided fixed binding of the sensor capacitors to any desired potential.
REFERENCES:
patent: 3193803 (1965-07-01), Hoffman
patent: 3886447 (1975-03-01), Tanaka
patent: 4039940 (1977-08-01), Butler et al.
patent: 4283676 (1981-09-01), Shaw
patent: 4862382 (1989-08-01), Schneider et al.
patent: 5210501 (1993-05-01), Schneider et al.
patent: 5257210 (1993-10-01), Schneider et al.
Watanabe et al., "A Switched-Capacitor Interface for Intelligent Capacitive Transducers", IEEE Transactions on Instrumentation and Measurement, vol. IM-35, No. 4, pp. 472-476, Dec. 1986.
Matsumoto et al., "A Switched-Capacitor Digital Capacitive Meter", IEEE Transactions on Instrumentation and Measurement, vol. IM-35, No. 4, pp. 555-559, Dec. 1986.
Kondo et al., "A Switched-Capacitor Interface for Capacitive Sensors with Wide Dynamic Range", IEEE Transactions on Instrumentation and Measurement, vol. 38, No. 3, pp. 736-739, Jun. 1989.
Matsumoto et al., "A Switched-Capacitor Charge Balancing Analog-to-Digital Converter and Its Application to Capacitance Measurement", IEEE Transactions on Instrumentation and Measurement, vol. IM-36, No. 4, pp. 873-878, Dec. 1987.
J. Knapp, "Einfacher Anpasser fuer kapazitive Sensoren", 8008 Technisches Messen 54, Heft 3, pp. 111-115, 1987.
Schneider Georg
Wagner Richard
Endress u. Hauser GmbH u. Co.
Swarthout Brent
Wu Daniel J.
LandOfFree
Capacitive sensor signal processing arrangement using switch cap does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Capacitive sensor signal processing arrangement using switch cap, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitive sensor signal processing arrangement using switch cap will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1831038