公开(公告)号：US5168178A

公开(公告)日：1992-12-01

申请号：US752780

申请日：1991-08-30

申请人： Michael J. Allen ,  Terry L. Baucom ,  Diana Esmail-Zandi

发明人： Michael J. Allen ,  Terry L. Baucom ,  Diana Esmail-Zandi

IPC分类号： H03K19/173

CPC分类号： H03K19/1736 ,  H03K19/1731 ,  H03K19/1737

摘要： The present invention discloses an improved two-stage macrocell for Programmable Logic Devices. According to the first stage of the improved circuit of the present invention's macrocell, combined NOR'ing, inverting, MUX'ing, and latching functions are performed by the single first stage. This single stage replaces the prior art multiple stages for performing the same NOR'ing, inverting, MUX'ing, and latching functions of the present invention. Since the present invention replaces the prior art multiple stages with a single stage, the speed of the present invention in performing the above NOR'ing, inverting, MUX'ing, and latching functions is significantly improved over the prior art. Furthermore, the present invention also discloses a second stage for a low-noise temperature-compensated output circuit. According to this aspect of the present invention, the low temperature noise on the ground and the supply voltage lines is reduced so that the low temperature noise approximately equals the high temperature noise on the ground and the supply voltage lines. Moreover, the speed improvement of the first stage of the present invention, described above, compensates for any speed degradation produced by the low-noise temperature-compensated output circuit of the second stage, so that the overall speed of the first and the second stages of the macrocell of the present invention is still improved over the prior art multiple-stage macrocell.

摘要翻译： 本发明公开了一种用于可编程逻辑器件的改进的两级宏单元。 根据本发明的宏单元的改进电路的第一阶段，由单个第一阶段执行组合NOR，反相，多路复用和锁存功能。 该单级替代了用于执行本发明的相同NOR，反相，多路复用和锁存功能的现有技术的多个级。 由于本发明用单级代替现有技术的多级，所以与现有技术相比，本发明在执行上述NOR，反相，多路复用和锁存功能方面的速度显着提高。 此外，本发明还公开了一种用于低噪声温度补偿输出电路的第二级。 根据本发明的这个方面，降低了地面上的低温噪声和电源电压线，使得低温噪声大致等于地面和电源电压线上的高温噪声。 此外，如上所述的本发明的第一级的速度改进补偿由第二级的低噪声温度补偿输出电路产生的任何速度劣化，使得第一级和第二级的总速度 与现有技术的多级宏小区相比，仍然改进了本发明的宏小区。