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OPA551: OPA551 OPA552 TLV172

Part Number: OPA551
Other Parts Discussed in Thread: TLV172, , OPA552

你好,我在做一个LDO的仿真,通过仿真验证了不同运放对LDO输出电压纹波的影响。仿真设置输入电压为5.5V,并且有一个峰峰值为50mV,200kHz的三角波纹波。输出设为5V。

仿真结果如下,OPA551增益带宽3MHz:输出纹波3.36mV;OPA552增益带宽12MHz,输出纹波1.5mV;TLV172增益带宽10MHz,输出纹波18.49mV。下面是仿真模型和输出纹波仿真图。

我的理解中,增益带宽越高输出纹波越小,但是仿真结果却不是这样,是仿真模型有问题吗,还是有运放其他参数有影响。可以详细解释一下吗,谢谢。