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您好，
输出功率=Po = Urms^2 / R
输出功率与输入信号电压幅值、设置增益、负载阻抗和Vlimit 有关，负载阻抗是已知参数4Ω，看您电路中Plimit已经接GVDD，未限制输出幅值，那么只能通过改变输入信号幅值和提高增益来增加输出功率了，如果输入的信号幅值和设置的增益已经使输出电压幅值达到了供电电压能达到的最大值，欲想再提高输出功率，只能提高供电电压了
