Sensor with improved capacitive to voltage converter integrated

Details Sensor with improved capacitive to voltage converter integrated Sensor with improved capacitive to voltage converter integrated

1998-01-26

2000-05-09

Raevis, Robert

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

G01L 912

Patent

active

060587830

ABSTRACT:
A capacitive transducer (10) which provides an output voltage in response to the application of a mechanical stimulus such as pressure or acceleration includes a signal conditioning integrated circuit (12) to which are connected a variable capacitor (C.sub.VAR), a reference capacitor (C.sub.REF), a linear correction capacitor (C.sub.LIN) as well as an integrating capacitor (C.sub.INT) and associated filtering components. The linear correction capacitor (C.sub.LIN) is used to offset a fixed parasitic charge associated with the variable capacitor. Any net error charge appearing on a detect, common node (pin 4) between the variable capacitor and the reference capacitor is cancelled out by means of an analog feedback network (22). In a modified embodiment a thermal compensation network (40) allows for correction for thermal error at a second temperature without having any affect at a first temperature.

REFERENCES:
patent: 4227419 (1980-10-01), Park
patent: 4398426 (1983-08-01), Park et al.
patent: 4982351 (1991-01-01), Kawate et al.
patent: 5241850 (1993-09-01), Kawate
patent: 5445031 (1995-08-01), Benzel
patent: 5534773 (1996-07-01), Tsugai et al.
patent: 5637798 (1997-06-01), Schatz
patent: 5909132 (1999-06-01), Trofimenkoff et al.
Publication: An Integrated Circuit for Capacitive Pressure Transducers; Mohammed Faheem Akram (Apr. 7-9, 1981).

Affiliated with

Also associated with

Rating

Sensor with improved capacitive to voltage converter integrated does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sensor with improved capacitive to voltage converter integrated , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensor with improved capacitive to voltage converter integrated will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1054053