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https://designers-guide.org/forum/YaBB.pl Measurements >> Other Measurements >> internal power in .lib files https://designers-guide.org/forum/YaBB.pl?num=1213627879 Message started by Evgenii on Jun 16th, 2008, 7:51am |
Title: internal power in .lib files Post by Evgenii on Jun 16th, 2008, 7:51am Hi! I simulate internal power ("rise_power", "fall_power", internal power group in .lib format synopsys) for digital library cells. But i do it manually, w/o special tools like nanochar . In particular, i use internal function of spice simulator. In simplest cells (invs, buffs) the following assumption works: Internal power = total power –C_load*VDD*VDD/2, where total power = integral i_vdd(t) during rise/fall time for output signal* VDD In some cases, fall_power is negative. Results looks good as in an available sample file. But in complex cells (flip-flops for example), in sample .lib file internal power poorly depends from C_load, does not depend almost. I have different results, for big load capacitances (I use same templates) internal power exceeds ten times power, which presented in sample file. ????? Thanks for help! |
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