Emi suppressing regulator

An integrated circuit having power control and logic circuitry and a regulator circuit arranged to receive a power supply and to provide a regulated DC power supply output to provide the regulated power supply to the logic circuitry the regulator circuit having a controllable current source circuit, a controller arranged to control the controllable current source circuit, and a capacitor, the controllable current source circuit and the capacitor being coupled together such that an output of the controllable current source circuit can provide a lower frequency current part of the regulated power supply output, and such that the capacitor can supply a higher frequency current part of the regulated power supply output, and the controller being arranged to control the controllable current source circuit according to feedback from the regulated power supply output, and to restrict a rate of change of the output of the controllable current source.

A method of manufacturing the integrated circuit having power control and logic circuitry, and a regulator circuit, the regulator circuit being arranged to receive a power supply and to provide a regulated power supply output, the regulator circuit having a controllable current source circuit, a controller arranged to control the controllable current source circuit, and a capacitor, the controllable current source circuit and the capacitor being coupled together such that an output of the controllable current source circuit can provide a lower frequency current part of the regulated power supply output, and such that the capacitor can supply a higher frequency current part of the regulated power supply output, and the controller being arranged to control the controllable current source circuit according to feedback from the regulated power supply output, and to restrict a rate of change of the output of the controllable current source circuit, the method having the steps of forming the controllable current source circuit, forming the controller arranged to control the controllable current source circuit, and forming the capacitor.

A method of regulating a power supply, to provide a regulated power supply output, a regulator circuit being provided having a controllable current source circuit, and a capacitor, the method having the steps of receiving the power supply and controlling the controllable current source circuit according to feedback from the regulated power supply output to provide a lower frequency current part of the regulated power supply output, such that the capacitor can supply a higher frequency current part of the regulated power supply output, and controlling the controllable current source circuit to restrict a rate of change of the output of the controllable current source circuit.