Mosfet sizing problem in charge pump using CMOS 0.18um technology

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Donna Ambalong

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I've been simulating a PMOS charge pump and my application is on non-volatile memory circuits (i.e. EEPROM). My concerns are the following:

1. What is the desired current value should the charge pump dissipate for my target application?

2. Any desired sizes for my PMOS devices to acquire the said current?

I'm using 0.18um CMOS technology
This is the circuit:
 

Problem on sizing pmos charge pump

I've been simulating a PMOS charge pump using 0.18um CMOS technology via SYNOPSY. The problem is all the PMOS devices are in cut-off region when extracted the .lis file and I have to drive a current of 10uA for EEPROM as an application. But when I tried to increase the sizes of the PMOS devices the output voltage seems to go down from the desired output voltage. What could be the problem or any idea how should this be solved?
Refer to the figure below for the circuit:
 

Question: Since you refer to P-devices, then your schematic #2 has the correct mosfet icons. However they still have a connection from the gate to the lower terminal. Did you intend this?
 

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