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    • 8. 发明授权
    • Discretionary lithography for integrated circuits
    • 根据需要为集成电路光刻
    • EP0557079B1
    • 1998-12-23
    • EP93301161.1
    • 1993-02-17
    • Elm Technology Corporation
    • Leedy, Glenn J.
    • G06F11/20H01L23/525H01L21/66
    • G03F7/70466G11C29/006H01L22/22H01L23/525H01L2924/0002H01L2924/00
    • Large scale integrated circuits are fabricated using redundant circuit elements to replace defective circuit elements by discretionary interconnect changes as determined by fine-grain testing of the integrated circuits after the logic units (such as individual transistors or logic gates) are fabricated and before they are electrically interconnected. The redundant circuit elements are then interconnected to non-defective circuit elements by one of two methods. In the first method a stepper-scanner apparatus modified to expose most of a resist layer defines the interconnect circuitry, but is shuttered-off over the discretionary interconnect changes. Then the discretionary interconnect changes are exposed by a conventional direct write on wafer pattern generation apparatus. In the second method, the interconnect patterning is accomplished by first fabricating a fixed custom mask defining the interconnect layer for a particular lot size (such as 100) of wafers. The fixed mask is fabricated after each wafer of the lot has been tested, and incorporates all the discretionary changes required to avoid interconnection to each defective circuit element in each of the wafers. The fixed custom mask is then used to expose the resist layer defining the interconnect circuitry for each of the 100 wafers.
    • 10. 发明授权
    • INTEGRATED CIRCUITS
    • 集成电路。
    • EP0366702B1
    • 1994-01-19
    • EP88905982.0
    • 1988-07-15
    • CATT, Ivor
    • CATT, Ivor
    • G06F11/20G06F11/26
    • G01R31/318511G01R31/318505G11C29/006
    • PCT No. PCT/GB88/00570 Sec. 371 Date Jan. 16, 1990 Sec. 102(e) Date Jan. 16, 1990 PCT Filed Jul. 15, 1988 PCT Pub. No. WO89/00728 PCT Pub. Date Jan. 26, 1989.Each component circuit of an LSI wafer includes a kernel logic section that checks the integrity of the circuit to which it belongs according to a step-by-step process by which progressively larger portions of the circuit are tested. Logic tested during one step is involved in the next step, and once testing of the component circuit is completed, it is extended to testing adjacent circuits of the wafer. Detection of a fault at any stage results in isolation of the faulty circuit or part of it. Test programs and data are stored in ROM within the component circuit, or are supplied via wires bonded to the wafer, for storage in RAM. On completion of the testing, configuration logic within the circuits interconnects the good circuits in an array for communication of signals between them. The kernel logic may be shared between groups of component circuits.