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how to design high speed opamp which can deliver 100mA of output current?

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xuexucheng

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how to design high speed opamp which can deliver 100mA of output current?
Do we need very wide mosfet at the last stage ?
e.g. when the W/L=1, the bias current is 1uA. then when 100mA then W/L=100000? how to layout??!!
and the large mosfet will cause low speed. how to high speed?
thank you a lot!!!
 

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