	US 12,470,135 B2
	Comparator-based switched-capacitor circuit
Shih-Hsiung Huang, Hsinchu (TW); and Wei-Cian Hong, Hsinchu (TW)
Assigned to REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed by REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed on Mar. 10, 2023, as Appl. No. 18/119,861.
Claims priority of application No. 111110684 (TW), filed on Mar. 22, 2022.
Prior Publication US 2023/0308016 A1, Sep. 28, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/07 (2006.01)

CPC H02M 3/07 (2013.01)

10 Claims

1. A comparator-based switched-capacitor circuit (SC circuit) having a first input terminal, a second input terminal, a first output terminal, and a second output terminal, the first output terminal outputting a first output signal and the second output terminal outputting a second output signal, the comparator-based SC circuit comprising:

a comparator;

a first switch;

a second switch;

a third switch;

a fourth switch;

a fifth switch;

a sixth switch;

a seventh switch;

an eighth switch;

a ninth switch;

a tenth switch;

a first current source coupled to the comparator and the first output terminal;

a second current source coupled to the comparator and the second output terminal;

a first capacitor having a first end and a second end, the first end being coupled to the first input terminal through the first switch and coupled to the first output terminal through the fourth switch, the second end being coupled to the comparator and coupled to a reference voltage through the third switch;

a second capacitor having a third end and a fourth end, the third end being coupled to the first input terminal through the second switch and coupled to the reference voltage through the fifth switch, the fourth end being coupled to the comparator and coupled to the reference voltage through the third switch;

a third capacitor having a fifth end and a sixth end, the fifth end being coupled to the second input terminal through the sixth switch and coupled to the second output terminal through the ninth switch, the sixth end being coupled to the comparator and coupled to the reference voltage through the eighth switch;

a fourth capacitor having a seventh end and an eighth end, the seventh end being coupled to the second input terminal through the seventh switch and coupled to the reference voltage through the tenth switch, the eighth end being coupled to the comparator and coupled to the reference voltage through the eighth switch; and

a compensation circuit coupled to the first output terminal and the second output terminal and configured to generate a first voltage difference corresponding to the first output signal and a second voltage difference corresponding to the second output signal, and to apply the first voltage difference and the second voltage difference to the second output terminal and the first output terminal, respectively.