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    • 7. 发明公开
    • Parametric tuning of an integrated circuit after fabrication
    • Parametrische Abstimmung einer integrierten Schaltung nach der Herstellung
    • EP0752677A2
    • 1997-01-08
    • EP96304968.9
    • 1996-07-05
    • SUN MICROSYSTEMS, INC.
    • Rajivan, SathyanandanSalem, Raoul B.
    • G06F17/50
    • G01R31/30G01R31/31702H03K19/0005H03K19/0027H03K19/018585H03K19/1731H03K2005/00071
    • The present invention provides an apparatus and method for repairing or improving the behavior of a tunable circuit of an integrated circuit (IC) when a target parameter exceeds a predetermined range due to a design and/or fabrication problem. The tunable circuit includes one or more tuning controllers for tuning a corresponding number of target circuits. Each tuning controller includes one or more registers and an optional decoder. Each target circuit includes a tunable portion and a functional portion. The functional portion can have one or more of a wide variety of functions including but not limited to logical gates, buffers, signal generators and amplifiers. The selectable parameters of the tunable circuit include timing delays, trip voltages, rise/fall times and/or output impedances. When a circuit designer wishes to tune the target parameter, an appropriate tuning pattern is latched into registers of the tuning controller. In turn, the tuning controller generates corresponding tuning pattern signals enabling target circuit(s) to changeably tune the target parameter by selectively enabling different tunable portions of the target circuit. For example, by selecting the appropriate load resistance and/or capacitance of the tunable circuit, the rise/fall time of the target circuit is tuned for compatibility with respect to the other portions of the IC or system. The tunable circuit of the present invention advantageously lends itself to post-fabrication correction of design or fabrication problems, thereby increasing the potential yield rate. In addition, the tunable circuit can be tested under different operating conditions in a non-destructive manner without the need for another time-consuming and costly IC fabrication cycle. Other advantages include the ability to selectively operate target circuit(s) of the IC at a higher speed under ideal conditions and at a lower speed under hostile conditions.
    • 本发明提供了一种由于设计和/或制造问题而在目标参数超过预定范围时修复或改进集成电路(IC)的可调电路的行为的装置和方法。 可调谐电路包括用于调谐相应数目的目标电路的一个或多个调谐控制器。 每个调谐控制器包括一个或多个寄存器和可选的解码器。 每个目标电路包括可调部分和功能部分。 功能部分可以具有一种或多种多种功能,包括但不限于逻辑门,缓冲器,信号发生器和放大器。 可调谐电路的可选参数包括定时延迟,跳闸电压,上升/下降时间和/或输出阻抗。 当电路设计者希望调整目标参数时,适当的调谐模式被锁存到调谐控制器的寄存器中。 接着,调谐控制器产生相应的调谐模式信号,使得目标电路能够通过选择性地使得目标电路的不同可调谐部分可变地调谐目标参数。 例如,通过选择可调电路的适当的负载电阻和/或电容,目标电路的上升/下降时间被调整以便相对于IC或系统的其它部分的兼容性。 本发明的可调电路有利地适用于设计或制造问题的后制造校正,从而增加潜在的产量率。 另外,可以以不破坏性的方式在不同的工作条件下测试可调谐电路,而不需要另外耗时且昂贵的IC制造周期。 其它优点包括能够在恶劣条件下在理想条件下以较低速度选择性地操作IC的目标电路。