Hi Yangang,
The LMH5401 is not stable for unity gain in the standard EVM configuration. However, it can be achieved by few changes. The excel calculator you are referring doesn't account for lower gains. You can follow the below reference design when…
Hello Nhan, The LMH5401 does support unity gain however, it requires some extra care. There is a reference design that illustrates this. For gain less than 1 you need to be aware that the amplifier feedback resistors create a bypass path around the amplifier…
Hello Cafain,
The answer is that it depends. Many FDA amplifiers are either stable or nearly so at gains of less than 1. In order to be sure you would need to at least simulate your complete application circuit and to be certain a prototype build…
Hi Joel,
The reason for this guidance is that capacitance on the amplifier input pins and the amplifier output pins will cause reduced stability. You are correct that this is generic advice on board layout. It applies equally to nearly all voltage feedback…
