CURRENT MISMATCHING COMPENSATION CIRCUIT FOR FAST CMOS CHARGE PUMP

摘要

The present invention discloses a current mismatch compensation circuit of a high speed CMOS charge pump. The circuit is a first current mirror connected between the first power supply and the second power supply to mirror the reduction current to reduce the output current, and a second current connected to the first power supply to mirror the increase current to increase the output current. An output current reduction controller for outputting the reduction current generated by the mirror and the first current mirror to the output terminal in response to the reduction control signal, and the increase current generated by the second current mirror as the output terminal in response to the increase control signal. An output current increase control unit for outputting, and a current mismatch compensation unit connected between the first power source and the second power source and compensating for the current mismatch generated between the second current mirror and the output current increase control unit in response to the increase current. have. Therefore, it is possible to reduce the current mismatch occurring between the second current mirror and the output current increasing control portion, and to drive a large amount of current while having a low current deviation between the increase and decrease currents when the current switching is started.