Hi, Whats the type of feedback in a standard pmos ldo. I mean, what is sampled at the output is it voltage or current. Also in a current mode bandgap(eg:banba)i believe we are sampling the output current and feeding back voltage(through the diode connected bandgap).I dont see any actual difference between the two (banba bandgap and a pmos ldo standard topo with error amp and output pmos stage). I wanted to know if there is any sure shot method of identifying the sampling.

Raja, I know that it has to be voltage series( otherwise it would not be used in the first place,psrr would be bad). But when comparing it with a current mode bandgap topology which also looks similar iam not able to understand why it should be shunt sampling in ldo at output and series sampling in a bandgap output. I need some explanation on this.