Active solid-state devices (e.g. – transistors – solid-state diode – Integrated circuit structure with electrically isolated... – Passive components in ics
Reexamination Certificate
2007-01-09
2007-01-09
Tan, Vibol (Department: 2819)
Active solid-state devices (e.g., transistors, solid-state diode
Integrated circuit structure with electrically isolated...
Passive components in ics
C257S538000, C257S516000, C438S382000, C438S694000, C700S121000
Reexamination Certificate
active
11070464
ABSTRACT:
A programmable resistor includes a variety of taps. Selection of any of a variety of tap combinations establishes a path through which current will flow, thus, setting the resistance value of the programmable resistor. The programmable resistor minimizes the effects of parasitic end boundary resistances, Rend/w, between contacts and resistive areas by limiting the contribution of the end boundary resistances to 2Rend/w, regardless of the programmed tap combination. By fabricating a contiguous region of impedance material, only the Rend/w end boundary resistances associated with selected taps affect the value of the programmed resistance. A notched tap structure provides predictability of the resistance value of each tap combination. Taps are narrowed to form a notch which establishes a well-defined current flow path, thus providing the resistance predictability. Additionally, notches also allow for a wider contact-resistive area end boundary, thus, further minimizing the parasitic effect of Rend.
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Huang Gexin
Muyshondt G. Patrick
Wong Jhonny A.
Chambers Kent B.
Cirrus Logic Inc.
Hamilton & Terrile LLP
Tan Vibol
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