US 12,436,555 B2
Voltage regulator having capacitive feed-forward ripple cancellation circuit
Jeongjin Roh, Ansan-si (KR); Woobin Kang, Ansan-si (KR); and Tian Guo, Ansan-si (KR)
Assigned to INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY ERICA CAMPUS, Ansan-si (KR)
Filed by INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY ERICA CAMPUS, Ansan-si (KR)
Filed on Mar. 29, 2023, as Appl. No. 18/192,214.
Claims priority of application No. 10-2022-0069153 (KR), filed on Jun. 7, 2022.
Prior Publication US 2023/0393601 A1, Dec. 7, 2023
Int. Cl. G05F 1/59 (2006.01); G05F 1/46 (2006.01); G05F 1/565 (2006.01)
CPC G05F 1/59 (2013.01) [G05F 1/467 (2013.01); G05F 1/565 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A voltage regulator comprising:
a pass unit configured to transfer, in response to a control signal, an input voltage provided from an input terminal to an output voltage of an output terminal;
an error amplification unit configured to output a comparison signal on the basis of a magnitude comparison result between the output voltage and a reference voltage; and
a feed-forward ripple cancellation unit configured to remove a ripple included in the input voltage using the reference voltage and the comparison signal in order to generate the control signal,
wherein the feed-forward ripple cancellation unit includes a feed-forward amplifier and a summing amplifier,
wherein the feed-forward ripple cancellation unit includes:
a first capacitor having one end connected to the input terminal and another end connected to a negative input terminal of the feed-forward amplifier;
a second capacitor having one end connected to the negative input terminal of the feed-forward amplifier and another end connected to an output terminal of the feed-forward amplifier;
a third capacitor having one end connected to the output terminal of the feed-forward amplifier and another end connected to a negative input terminal of the summing amplifier; and
a fourth capacitor having one end connected to the negative input terminal of the summing amplifier and another end connected to an output terminal of the summing amplifier.