1- How can calculate the value of the output voltage?
With the half-bridge (my post #6 schematic), the output amplitude can only attain 1/2 of the supply V.
My schematic has a 10V supply, hence the output can attain +- 5V max. This is after I increased the driving voltage at the transistor bases to 10V each. (Previously it was 5V each, causing a meager +- 2.3V output.)
It is not easy to calculate the output voltage. Several factors need to be taken into account.
You must bias the transistors/mosfets sufficiently to pass the amount of current your load requires.
The capacitor must be a high enough value so that it stays at about the same DC charge throughout a cycle.
2- I need a voltage of about 12 volts and current of about 2000mA That should be changed: [0-12] and [0-2000]
You would need a large value capacitor to provide that amount of power, for time periods measured in seconds.
It is more practical to consider using a full H-bridge.
Here is an illustration of a simple H-bridge:
3- Please Explain more, about generation CLK1 and CLK2?
These can be provided by a fancy arrangement of a pulse generator and logic gates.
4- What software have you used for this circuit?
This is Falstad's animated interactive simulator. Free to download and use at falstad.com/circuit.
If you click the link below, it will open the falstad website, load my H-bridge schematic (above) into falstad's simulator, and run it on your computer.
https://tinyurl.com/n6rsakz