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I have modifyed the picturerenwl said:what's the function of this circuit?
why it can't work as a startup circuit?when power on,C2 makes the gate of the NMOS to VDD,start up the circuit ?niezimei said:This is a constant gm current source.Caps are not used for start up here.C1 is a decoupling cap,but C2 will make the psrr much more worse for the noise in the power line will be shorted to the gate of nmos at the high frequency.