US 12,278,566 B2
Preprocessing circuit for comparators and preprocessing method thereof
Changxian Zhong, Chengdu (CN)
Assigned to Chengdu Monolithic Power Systems Co., Ltd., Sichuan (CN)
Filed by Chengdu Monolithic Power Systems Co., Ltd., Chengdu (CN)
Filed on Feb. 24, 2023, as Appl. No. 18/174,301.
Claims priority of application No. 202210224229.8 (CN), filed on Mar. 9, 2022.
Prior Publication US 2023/0216415 A1, Jul. 6, 2023
Int. Cl. H02M 3/158 (2006.01); H03K 5/24 (2006.01)
CPC H02M 3/1584 (2013.01) [H03K 5/2481 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A preprocessing circuit for a comparator, the comparator having a first comparison terminal and a second comparison terminal, the preprocessing circuit comprising:
a first input terminal, configured to receive a first voltage;
a second input terminal, configured to receive a second voltage;
a first output terminal, configured to provide a first comparison voltage to the first comparison terminal; and
a second output terminal, configured to provide a second comparison voltage to the second comparison terminal; wherein
when the first voltage is larger than the second voltage and a difference between the first voltage and the second voltage is larger than a first reference voltage, the first comparison voltage is equal to the first voltage, and the second comparison voltage is equal to the first voltage minus the first reference voltage; and wherein
when the first voltage is larger than the second voltage and the difference between the first voltage and the second voltage is smaller than the first reference voltage, the first comparison voltage is equal to the first voltage, and the second comparison voltage is equal to the second voltage; and wherein
when the first voltage is smaller than the second voltage and the difference between the first voltage and the second voltage is smaller than a second reference voltage, the first comparison voltage is equal to the first voltage, and the second comparison voltage is equal to the second voltage; and wherein
when the first voltage is smaller than the second voltage and the difference between the first voltage and the second voltage is larger than the second reference voltage, the first comparison voltage is equal to the second voltage minus the second reference voltage, and the second comparison voltage is equal to the second voltage.