Low-noise voltage regulators and associated methods

A multi-output, low-noise voltage regulator, comprising:

• a first error amplifier configured to generate a first error signal that is proportional to a difference between a voltage at a first ground node and a voltage at a first set node;
• a first reference resistor electrically coupled between a first output power node and the first set node;
• a first reference current source electrically coupled to the first set node;
• a first control and power stage electrically coupled between a first input power node and the first output power node, the first control and power stage being configured to convert a first input voltage to a first output voltage in response to the first error signal to minimize a magnitude of the first error signal, the first input voltage being a voltage at the first input power node and the first output voltage being a voltage at the first output power node;
• a second error amplifier configured to generate a second error signal that is proportional to a difference between a voltage of a second ground node and a voltage at a second set node;
• a second reference resistor electrically coupled between a second output power node and the second set node;
• a second reference current source electrically coupled to the second set node;
• and
• a second control and power stage electrically coupled between a second input power node and the second output power node, the second control and power stage being configured to convert a second input voltage to a second output voltage in response to the second error signal to minimize a magnitude of the second error signal, the second input voltage being a voltage at the second input power node and the second output voltage being a voltage at the second output power node.

A method for controlling a low-noise voltage regulator, the method comprising:

• establishing a voltage having a first magnitude across a reference resistor electrically coupled between an output power node of the low-noise voltage regulator and a set node of the low-noise voltage regulator, the first magnitude being a desired magnitude of an output voltage, the output voltage being a voltage on the output power node of the low-noise voltage regulator;
• generating an error signal representing a difference between a voltage of the set node of the low-noise voltage regulator and a voltage of a ground node;
• and
• controlling a control and power stage electrically coupled between an input power node and the output power node in response to the error signal, the control and power stage being configured to convert an input voltage to the output voltage in response to the error signal to minimize a magnitude of the error signal, the input voltage being a voltage at the input power node.