US 11,940,829 B2
Voltage regulator and methods of regulating a voltage, including examples of compensation networks
Lionel Guiraud, Saint-Aubin-sur-Mer (FR); and Nguyen Trieu Luan Le, Cormelles-le-Royal (FR)
Assigned to SCALINX, Paris (FR)
Filed by SCALINX, Paris (FR)
Filed on Mar. 4, 2021, as Appl. No. 17/192,630.
Claims priority of application No. 20290058 (EP), filed on Aug. 7, 2020.
Prior Publication US 2022/0043471 A1, Feb. 10, 2022
Int. Cl. G05F 1/575 (2006.01)
CPC G05F 1/575 (2013.01) 13 Claims
OG exemplary drawing
 
1. A voltage regulator comprising:
a first amplifier having:
a first input couplable to a reference voltage;
a second input coupled to a feedback path;
a current mirror having an input and an output;
a first branch coupled to the input of the current mirror; and
a second branch coupled to the output of the current mirror, wherein a node of the second branch forms an output of the first amplifier;
a second amplifier comprising a transistor, wherein:
a first current terminal of the transistor forms a first input of the second amplifier couplable to a supply voltage;
a gate of the transistor forms a second input of the second amplifier coupled to the output of the first amplifier; and
a second current terminal of the transistor forms an output of the second amplifier coupled to an output of the voltage regulator, wherein the transistor has a parasitic capacitance between the second current terminal and the gate, and wherein the feedback path is also coupled to the output of the voltage regulator; and
a compensation network comprising at least one passive component, the at least one passive component comprising a first capacitor, wherein the compensation network is coupled to the input of the current mirror to reduce variations in an output current produced by the output of the voltage regulator caused by the parasitic capacitance between the second current terminal and the gate of the transistor of the second amplifier and variations in the supply voltage,
wherein the compensation network further comprises a further current mirror, and wherein:
the first capacitor is coupled between the first branch of the first amplifier and an input of the current mirror; and
an output of the further current mirror is coupled to the output of the voltage regulator.