Charge pump circuit and method for phase locked loop

摘要

A charge pump circuit can include a pump-up circuit having a first disable switch coupled between a pump-up output node and a first power supply node that is enabled and then disabled in response to a source current path between the pump-up node and a second power supply node being disabled, and a source off switch coupled in series with the first disable switch that is enabled in response to the source current path being disabled. The charge pump circuit can also include a pump-down circuit having a second disable switch coupled between a pump-down output node and the second power supply node that is enabled and then disabled in response to a sink current path between the pump-down node and a first power supply node being disabled. A sink off switch can be coupled in series with the second disable switch that is enabled in response to the sink current path being disabled.