| 摘要 |
PURPOSE: A negative voltage generating circuit is provided to economize a current consumption of a body bias applied to a P-well. CONSTITUTION: A negative voltage generating circuit comprises a Vpp detector(21), a switch(22), a controller(23) and a latch circuit(24). The Vpp detector(21) is operated responsive to an inverted version of an output signal(cut) of the controller(23), and detects whether a voltage(Vpp) reaches a predetermined voltage level. The Vpp detector(21) outputs a low level signal(det) when the voltage(Vpp) reaches a predetermined voltage level. The switch(22) transfers an output signal of the Vpp detector(21) to the latch circuit(24) in response to the output signal(cut) of the controller(23). The latch circuit(24) latches the signal transferred through the switch(22) to output the latched signal as a pump start signal(pump_strt) through an inverter(25). The controller(23) consists of an inverter(30) and an NOR gate(31), and generates the signal(cut) in response to the pump start signal(pump_strt) and a pump up signal(pwrup).
|
