Adaptive opamp compensation

A method comprising:

• controlling, in a voltage regulator circuit, a pass device to regulate an output voltage for supplying power to load devices by an amplifier;
• sensing a load current output from the pass device to the load devices;
• and
• generating a control signal to adjust a compensation capacitance of a variable capacitor based on the sensed load current to adjust a zero frequency of the voltage regulator circuit, a first terminal of the variable capacitor being directly coupled to one of inputs of the amplifier and a second terminal of the variable capacitor being coupled directly to the pass device.

A voltage regulator, comprising:

• a pass device configured to generate an output voltage for supplying power to load devices based on an unregulated power supply;
• a feedback circuit configured to generate a feedback voltage indicative of the output voltage;
• an amplifier configured to detect a difference between the feedback voltage and a reference voltage, and control, based on the difference, the pass device to regulate the output voltage;
• a compensation capacitor circuit configured to provide a zero frequency for the voltage regulator;
• and
• a load current based control circuit configured to sense a load current output from the pass device to the load devices and generate a control signal to adjust a compensation capacitance of the compensation capacitor circuit based on the sensed load current to adjust the zero frequency of the voltage regulator, a first terminal of the compensation capacitor being directly coupled to one of inputs of the amplifier and a second terminal of the compensation capacitor being coupled directly to the pass device.