Circuit for regulating leakage current in charge pump

A circuit for regulating a leakage current in a charge pump, comprising a first transistor, a third transistor and a fourth transistor, wherein:

• the first transistor has a gate connected to drains of the third and fourth transistors for receiving a bias voltage that is proportional to a supply voltage;
• the first transistor has a drain coupled to an output of the charge pump and a source that is grounded, a voltage at the drain of the first transistor being proportional to the supply voltage;
• the third transistor has a gate that is grounded, a source coupled to the supply voltage and the drain connected to the drain of the fourth transistor;
• the fourth transistor has a gate connected both to the drain of the fourth transistor and the gate of the first transistor and a source that is grounded;
• and
• a current between the source and drain of the first transistor is proportional to the supply voltage that powers the charge pump.