f=[0.15 1 4 11 20]
d=[1 1.3 2.5 5.3 9.5]
semilogx(f,d,'-*r','linewidth',2);
axis([0,20,0,12]);
legend('delay of buffer');
xlabel('buffer负载电容 fF','FontSize',12,'Fontname','微软雅黑');
ylabel('归一化buffer延迟','FontSize',12,'Fontname','微软雅黑');
title('电源电压0.6V时buffer延迟和负载电容关系','fontname','微软雅黑','fontsize',13)
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