Patent ID: 6771160
Filing Date: 2004-08-03
Classification: H01C,H05K,Y10S,Y10T

Abstract:
A resistor foil for use in forming an embedded resistor in a printed circuit board, comprised of:a copper layer having a first side and a second side; an oxide layer having a thickness of between 5 Ã¥ and 70 Ã¥ on said first side of said copper layer; a first layer of a first resistor metal having a thickness of between 50 Ã¥ and 2 &mgr;m formed directly on said oxide layer, said first resistor metal selected from the group consisting of aluminum, zinc, nickel, nickel/chromium, nickel/chromium/aluminum/silicon alloy, titanium, vanadium, chromium, tantalum, iron, manganese and alloys, oxides, nitrides and silicides thereof; and a second layer of a second resistor metal having a thickness of between 50 Ã¥ and 2 &mgr;m formed directly on said first layer of said first resistor metal, said second resistor metal selected from the group consisting of aluminum, zinc, nickel, nickel/chromium, nickel/chromium/aluminum/silicon alloy, titanium, vanadium, chromium, tantalum, iron, manganese and alloys, oxides, nitrides and silicides thereof, wherein said first resistor metal has a resistance different from said second resistor metal.