Self-regulated four-phased charge pump with boosted wells

Charge pumps are useful to achieve on-chip boosted voltages in EPROM and other NVM devices. A new capacitive charge pump architecture is suggested which eliminates bulk effect by boosting the wells of transistors in the charge pump stages. In addition, the pump contains an internal voltage regulator, enabling it to supply a constant boosted output, regardless of process, environment and loading conditions. The pump operates from a 2.7V supply, provides up to 10mA at 8V and occupies 2 mm/sup 2/.