Please read me first! The start up of the circuit shall be achieved by adjusting the VDD from 1V to 3.3V. There are 5 paths, the right path is the current mirror and the cascode current mirror, which mirror the voltage from the reference to other paths needing the reference voltage. I simulate the circuit from the professor Razavi's book. Chapter 5, which describe an elegant low voltage current mirror and its generation circuit.
