Electrical resistors – With base extending along resistance element – Resistance element coated on base
Patent
1977-03-14
1978-08-01
Albritton, C. L.
Electrical resistors
With base extending along resistance element
Resistance element coated on base
29620, 29621, 338 9, 338314, 427103, 427126, H01C 1012
Patent
active
041046072
ABSTRACT:
A first thin-film resistor member, preferably TaN, is disposed over a sec thin film member, such as NiCr, to completely cover the second member and act as a passivating layer preventing anodization of the second. The thin-film materials used for the first and second members have substantially an equal thin-film, sheet-resistance, resistance value per square (.OMEGA..quadrature.), with the first material being trimmable for this purpose. Also, the TCR (temperature coefficient of expansion) of the first material is negative while that of the second is positive. These members are coupled in parallel with substantially equal lengths but with differing widths which permit the first to completely cover the second. The arrangement permits the TCR of the parallel circuit to be brought substantially to a zero value and, in any event, a value no greater than .+-. 50 ppm/.degree. C. Additionally, the first member anodically protects the second with the protection being assured by the formation of an oxide film formed on the first by the trimming. The bi-film system is adapted for microcircuitry in that it provides an acceptable sheet resistance without requiring excessive lengths or widths of the parallel circuit members.
REFERENCES:
patent: 3393390 (1968-07-01), Louis
patent: 3591413 (1971-07-01), Seki et al.
patent: 3602861 (1971-08-01), Tweed
patent: 4019168 (1977-04-01), Collins
patent: 4025404 (1977-05-01), Joly et al.
Albritton C. L.
Critchlow Paul N.
Sciascia Richard S.
The United States of America as represented by the Secretary of
LandOfFree
Zero temperature coefficient of resistance bi-film resistor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Zero temperature coefficient of resistance bi-film resistor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zero temperature coefficient of resistance bi-film resistor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1982367