>addWellTap -cell $tap_cells -cellInterval [expr 4*$welltap_D] -checkerBoard-incr * >verifyWellTap 4,什么是Latch Up? Latch Up是CMOS电路的一种寄生现象,当Latch Up发生时,会形成一条从VDD到GND的低电阻通路,这会产生大电流,对芯片造成不可逆的损伤。 在CMOS电路中,两个寄生的BJT结构(PNPN)会形成...
所以就会有 “tap-less” libraries,但是由于仅有一个tap会由于NWEL和substrate的阻值而导致latch-up的出现,故而我们会在一定距离内添加well tap单元来避免latch-up效应, 2 Decap cells decap cell全称Decoupling Capacitor (解耦电容)。在CMOS电路运行过程中,信号的不断变化可能会导致电源电压的不稳定。这可以视为稳...
During fabrication, any standard cell connected to the power rail 50 has a path to the power rail 58, thus preventing a transistor from being destroyed due to electrostatic buildup. In FIG. 14, the NAC protection devices 88a and 88b prevent the destruction of gate dielectric during fabrication...
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This is to help tie them to your VDD and GND levels so that they don't drift too much (especially towards the middle of the chip) and cause latchup. Vote Up +1 Vote Down Stats Locked Replies 2 Subscribers 87 Views 19653 Members are here 0 Related Topics well tap a...
Each resistor cell is 50kΩ/255 or 196.1Ω for the MAX5400 and 100kΩ/255 or 392.2Ω for the MAX5401. The MAX5400/MAX5401 feature power-on reset (POR) circuitry that sets the wiper to the midscale position at power-up by loading a binary value of 128 into the 8-bit ...
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9, applying predictive selection to an exemplary 65 nm standard cell SERDES device, the number of clock domains, 2j, with 4 DFE taps at a baud rate of 6 Gbps (tmux=60 ps, tcq=120 ps, and tsu=60 ps, T=1/(6 Gbps)≈170 ps) leads to Equation (5) yielding 2(2.47)≦2j, thus...