Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2011-04-12
2011-04-12
Nguyen, Vincent Q (Department: 2831)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S689000
Reexamination Certificate
active
07924028
ABSTRACT:
A method and system for adjusting characteristics of a relative humidity sensor in order to achieve a desired value of accuracy is presented. A relative humidity sensor charge balance circuit includes a series of sensing capacitors Cx1, Cx2including a thin porous platinum top plate, a humidity sensitive polyimide dielectric, and two metal bottom plates on a semiconductor substrate; and two fixed oxide capacitances Cref, and C0. Changes in humidity affect the humidity sensitive dielectric thereby causing changes in the sensing capacitive value of the capacitive circuit. The charge in the sensing capacitor and the fixed capacitor C0can be controlled separately by adjusting and/or trimming the supply voltage using a voltage trimmer; thereby the slope and offset of the relative humidity sensor circuit can be modified and controlled to particular desired values.
REFERENCES:
patent: 4831325 (1989-05-01), Watson, Jr.
patent: 6230543 (2001-05-01), Froehling et al.
patent: 6724612 (2004-04-01), Davis et al.
patent: 6867602 (2005-03-01), Davis et al.
Written Opinion and International Search Report from corresponding PCT Application Serial No. PCT/US2009/034824, mailed Jun. 29, 2009, 7 pages.
Alimi Yousef
Davis Richard Alan
Honeywell International , Inc.
Nguyen Vincent Q
Shumaker & Sieffert P.A.
LandOfFree
Method and system for adjusting characteristics of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for adjusting characteristics of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for adjusting characteristics of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2718429