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How to size transistor for Voltage Control Current Source

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roki

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Hi everyone,currently i am constructing a voltage regulator and a voltage control current source(VCCS) is implemented into the circuit. I need help in sizing the transistors for VCCS.I let the sizing of all PMOS to be the same since it is a current mirror and also let the sizing of all NMOS be the same.When i run simulation,all transistors are always in subthreshold. I need it to be in saturation.I looked for sources to help design and size the circuit.However, i cant find any.Please help me.Any links that can guide me in the sizing would be great.I'm using 130n tech. circuit vccs.png
 

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