US 12,443,213 B2
Reference current generation circuit
Hiroyuki Kimura, Miyagi (JP)
Assigned to WILL SEMICONDUCTOR (SHANGHAI) CO. LTD., Shanghai (CN)
Filed by WILL SEMICONDUCTOR (SHANGHAI) CO. LTD., Shanghai (CN)
Filed on Feb. 8, 2023, as Appl. No. 18/166,265.
Claims priority of application No. 202211513676.1 (CN), filed on Nov. 29, 2022.
Prior Publication US 2024/0176380 A1, May 30, 2024
Int. Cl. G05F 3/26 (2006.01); G05F 1/56 (2006.01); G05F 3/24 (2006.01)
CPC G05F 3/262 (2013.01) [G05F 1/561 (2013.01); G05F 3/24 (2013.01); G05F 3/245 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A reference current generation circuit, comprising:
a first current mirror, copying a first reference current;
a second current mirror, copying a second reference current;
a third current mirror, through which a current obtained by adding the first reference current copied by the first current mirror and the second reference current copied by the second current mirror is made to flow;
a reference resistor of a first type, through which the first reference current obtained by subtracting the second reference current copied by the second current mirror from one output of the third current mirror is made to flow; and
a reference resistor of a second type, through which the second reference current obtained by subtracting the first reference current copied by the first current mirror from the other output of the third current mirror is made to flow; wherein
by the third current mirror, voltage drops at the reference resistor of the first type and the reference resistor of the second type are made the same, and the second reference current is set to be inversely proportional to the resistance value of the reference resistor of the second type.