Capacitance type physical quantity detector

Details Capacitance type physical quantity detector Capacitance type physical quantity detector

2007-09-11

2007-09-11

Cygan, Michael (Department: 2855)

Measuring and testing

Gas analysis

Moisture content or vapor pressure

C324S670000

Reexamination Certificate

active

11185751

ABSTRACT:
A capacitance type physical quantity detector includes a sensor unit of which the capacitance varies depending upon a change in the physical quantity and a C-V converter unit which converts a change in the capacitance of said sensor unit into a voltage. The C-V converter unit includes an operational amplifier, a feedback capacitor, switching means connected in parallel with said feedback capacitor, a reference voltage-generating circuit for applying a reference voltage to the operational amplifier, and a drive voltage-generating circuit for applying a drive voltage to said sensor unit. At least any one of the feedback capacitance of said feedback capacitor, the reference voltage formed by said reference voltage-generating circuit or the drive voltage formed by said drive voltage-generating circuit varies depending upon the temperature to correct temperature characteristics of the sensor unit.

REFERENCES:
patent: 3493855 (1970-02-01), Norwich
patent: 4626774 (1986-12-01), Regtien
patent: 6580600 (2003-06-01), Toyoda et al.
patent: 6867602 (2005-03-01), Davis et al.
patent: 2002/0114125 (2002-08-01), Toyoda et al.
patent: 2003/0010119 (2003-01-01), Toyoda
patent: A-5-248976 (1993-09-01), None
patent: A-10-339750 (1998-12-01), None

Affiliated with

Also associated with

Rating

Capacitance type physical quantity detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Capacitance type physical quantity detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitance type physical quantity detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3781177