US 11,693,439 B2
Voltage regulator capable of providing stable output voltage signal
Kuo-Wei Chang, Taipei (TW)
Assigned to GUTSCHSEMI LIMITED, Hong Kong (HK)
Filed by GUTSCHSEMI LIMITED, Hong Kong (HK)
Filed on Aug. 23, 2021, as Appl. No. 17/409,735.
Claims priority of provisional application 63/192,583, filed on May 25, 2021.
Prior Publication US 2022/0382308 A1, Dec. 1, 2022
Int. Cl. G05F 1/575 (2006.01); G05F 1/56 (2006.01)
CPC G05F 1/575 (2013.01) [G05F 1/56 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A voltage regulator, comprising:
a level shifter configured to shift a voltage value of a reference voltage signal to generate a set voltage signal;
a low-pass filter coupled to the level shifter and configured to filter the set voltage signal to generate a filtered voltage signal;
a voltage regulating circuit coupled to the low-pass filter, configured to output an output voltage signal according to the filtered voltage signal, and adjusting a voltage value of the filtered voltage signal according to a change of the output voltage signal to stabilize a voltage value of the output voltage signal, wherein the voltage regulating circuit comprises:
a first error amplifier, wherein a non-inverting input terminal of the first error amplifier receives the filtered voltage signal, an inverting input terminal of the first error amplifier receives the output voltage signal, and an output terminal of the first error amplifier is used to output a first voltage signal;
a first buffer coupled to the output terminal of the first error amplifier, configured to receive the first voltage signal, providing a second voltage signal according to the first voltage signal, and outputting the second voltage signal at an output terminal of the first buffer; and
a second buffer coupled to the output terminal of the first buffer, configured to receive the second voltage signal, and providing the output voltage signal according to the second voltage signal; and
a compensation circuit coupled to the low-pass filter and the voltage regulating circuit and configured to provide a compensation signal according to the output voltage signal and the filtered voltage signal, wherein the compensation signal is used to compensate a voltage value of the second voltage signal.