It is not in need of buffer stage for cascading because of high input impedance.

因为具有很高的输入阻抗，所以级联时不需缓冲级。

youdao

The buffer stage (350) may buffer a filtered signal from the filter stage (340).

所述缓冲级（350）可对来自所述滤波级（340）的经滤波信号进行缓冲。

youdao

The amplifier may further include a second filter stage (360) and a second buffer stage (370).

所述放大器可进一步包括第二滤波级(360)及第二缓冲级(370)。

youdao

Hairballs mean more inventory costs because at each geographically separate production stage a buffer stock of unfinished items is kept to cope with any disruptions in the flow from another plant.

WSJ: 3M Begins Untangling Its 'Hairballs'