Patent ID: 8754621
Filing Date: 2014-06-17
Classification: G05F

Abstract:
1. A linear voltage regulator (LVR) circuit, comprising: a resistive divider; a first amplifier having a first input coupled to an output of the resistive divider and a first output coupled to a second amplifier; the second amplifier having a second input coupled to the first output of the first amplifier and a second output coupled to a third amplifier; the third amplifier having a third input coupled to the second output of the second amplifier and a third output driving a pass transistor; the pass transistor having a gate terminal driven by the third amplifier, a first terminal coupled to an input of the LVR circuit, and a second terminal coupled to an output of the LVR circuit; a first capacitor coupling the output of the LVR circuit and the first output of the first amplifier; a second capacitor in series with a variable resistor coupling the second input and the second output of the second amplifier, wherein the variable resistor automatically adapts its value based on a voltage level of the second output of the second amplifier, wherein the voltage level of the second output of the second amplifier depends on a load current at the output of the LVR circuit; a first transconductance amplifier having a fourth input coupled to the output of the resistive divider and a fourth output coupled to the second output of the second amplifier; and a second transconductance amplifier having a fifth input coupled to the first output of the first amplifier and a fifth output coupled to the output of the LVR circuit.