Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1997-11-26
1999-11-23
Gaffin, Jeffrey
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307125, 307109, H02M 306, H01H 3500
Patent
active
059905786
ABSTRACT:
The invention relates to a capacitive sensor arrangement with a charge balance frequency converter. This consists of an operational amplifier, between the output and inverting input of which an integrating capacitor is connected and the noninverting input of which is connected with a reference potential. Furthermore, the arrangement consists of a first capacitor, one electrode of which can be connected with a first potential or with the reference potential and the other electrode of which can be connected with the reference potential or with the inverting input of the operational amplifier, and a second capacitor, the one electrode of which is connected either with a second potential or with the reference potential and the other electrode of which is connected with the reference potential or with the inverting input. Finally, a comparator is connected to the output of the operational amplifier and the arrangement is provided with a clock oscillator for controlling the switching processes.
REFERENCES:
patent: 4975701 (1990-12-01), Babanezhad et al.
patent: 5229771 (1993-07-01), Hanlon
patent: 5465604 (1995-11-01), Sherman
patent: 5583290 (1996-12-01), Lewis
Gaffin Jeffrey
Keplan Jonathan S.
Zentrum Mikroelektronik Dresden GmbH
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