Patent ID: 9742415
Date: 2017-08-22
CPC Classifications: H03L

Claim:
1. A charge pump comprising: a differential charge pump having differential inputs and primary and mirror outputs, and the differential charge pump responsive to a down signal at the differential inputs to provide a negative current at the primary output and a positive current at the mirror output, and responsive to an up signal at the differential inputs to provide a positive current at the primary output and a negative current at the mirror output; an auxiliary charge pump having differential inputs and an auxiliary output coupled to the mirror output of the differential charge pump, and responsive to the down signal at the differential inputs to provide a negative current at the auxiliary output, and responsive to the up signal at the differential inputs to provide a positive current at the auxiliary output a negative current source switchably coupled to the auxiliary output responsive to the down signal; and a positive current source switchably coupled to the auxiliary output responsive to the up signal.