Static capacitance determining circuit and capacitance determining method

The invention provides a static capacitance determining circuit having an input protection circuit and exhibiting a high sensitivity. The invented static capacitance determining circuit (20) is provided for determining the capacitance of a capacitive sensor (Cs), which comprises a buffer amplifier (...

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Bibliographische Detailangaben
1. Verfasser:	YAKABE, MASAMI
Format:	Patent
Sprache:	eng
Schlagworte:	DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS PUBLIC ADDRESS SYSTEMS TESTING
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Beschreibung
Zusammenfassung:	The invention provides a static capacitance determining circuit having an input protection circuit and exhibiting a high sensitivity. The invented static capacitance determining circuit (20) is provided for determining the capacitance of a capacitive sensor (Cs), which comprises a buffer amplifier (12) connected to the capacitive sensor (Cs) via a signal line (13) and having a voltage amplification ratio of 1; diodes (Dp1, Dp2) series connected between the signal line (13) and a positive power supply (+Vdd); and diodes (Dm1, Dm2) series connected between the signal line (13) and a negative power supply (-Vdd), wherein an output terminal of the buffer amplifier (12) is connected to a junction (21a) of the diodes (Dp1, Dp2) and to a junction (21b) of the diodes (Dm1, Dm2).