US 11,726,514 B2
Active compensation circuit for a semiconductor regulator
Shashwat, Kaushambi (IN); and Rajesh Narwal, Greater Noida (IN)
Assigned to STMicroelectronics International N.V., Geneva (CH)
Filed by STMicroelectronics International N.V., Geneva (CH)
Filed on Apr. 27, 2021, as Appl. No. 17/242,067.
Prior Publication US 2022/0350357 A1, Nov. 3, 2022
Int. Cl. G05F 1/59 (2006.01); G05F 1/575 (2006.01)
CPC G05F 1/59 (2013.01) [G05F 1/575 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A semiconductor regulator, comprising:
an input node configured to provide a supply voltage;
an output node;
an operational amplifier having an output configured to output a signal;
a power transistor having a first conduction terminal coupled to the input node, a second conduction terminal coupled to the output node and a control terminal, the power transistor being configured to:
receive, over the control terminal, the signal generated by the operational amplifier for driving the power transistor; and
provide an output voltage over the output node; and
an active compensation circuit having an output coupled to the control terminal of the power transistor and the output of the operational amplifier and having an input coupled to the input node, the active compensation circuit being configured to present a variable value equivalent capacitance and a variable value equivalent resistance to compensate the output voltage provided on the output node,
wherein the operational amplifier, the variable value equivalent capacitance, the variable value equivalent resistance and the power transistor are all on the same semiconductor substrate.