| CPC G05F 1/575 (2013.01) | 12 Claims |
|
1. A voltage regulator comprising:
an output stage comprising an input node for receiving an input voltage; an output node for outputting an output voltage; and an output device comprising at least one transistor configured to pass an output current to the output node based on a drive voltage at a control node;
a differential amplifier configured to receive a feedback signal derived from the output voltage at a first input and to receive a reference voltage at a second input and to generate an amplifier output to control the drive voltage of the output stage to minimise any difference between the feedback signal and the reference voltage; and
a controller operable to selectively reconfigure the output stage to provide a change in output current in response to a load activity signal indicative of a change in load activity that results in a change in load current demand for a load connected, in use, to the output node; and
a digital-to-analogue converter (DAC) coupled to the control node such that a variation in the DAC output results in a variation in the drive voltage and wherein the controller is configured to control the output of the DAC;
wherein the controller is operable to reconfigure the output stage to provide a variation in the drive voltage so as to provide at least some of said change in output current.
|