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您好,
C4和C6已经将直流信号隔去,所以输出端没有直流信号;
您可以对电路做直流分析,在输入直流信号时,C4是相当于断开的,因此,10倍增益对直流信号是没有的,它相当于跟随器,C6前端输出应该是跟随输入的2.5V,C6后端就是没有直流信号,因为C6把这个2.5V的直流量也隔去了。