CONSTANT INPUT CURRENT FILTER FOR POWER SUPPLIES AND RELATED SYSTEM AND METHOD

摘要

A system includes a capacitor (118) and a current source (116) configured to draw a constant input current from a power source (110) and to generate an output current. The current source includes an n-type field effect transistor (202) that is biased to operate as a constant current source. The current source is configured to provide the output current to the capacitor and charge the capacitor during a first time period associated with operation of a load. The current source is also configured to provide the output current to the load and the capacitor is configured to provide an additional current to the load during a second time period associated with operation of the load. The load could represent an electronic device having a time-varying output power characteristic, such as a wireless radio.