US 12,424,991 B2
Current source circuit and electronic device
Masahiro Ichihashi, Kanagawa (JP); Masayuki Katakura, Kanagawa (JP); Kazumasa Nishimura, Kanagawa (JP); Tetsuya Tashiro, Kanagawa (JP); and Nobuhiko Shigyo, Kanagawa (JP)
Assigned to SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
Appl. No. 18/001,846
Filed by SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
PCT Filed Apr. 27, 2021, PCT No. PCT/JP2021/016719
§ 371(c)(1), (2) Date Dec. 14, 2022,
PCT Pub. No. WO2021/261072, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2020-106673 (JP), filed on Jun. 22, 2020.
Prior Publication US 2023/0261623 A1, Aug. 17, 2023
Int. Cl. H03F 3/45 (2006.01); H03F 3/00 (2006.01)
CPC H03F 3/45475 (2013.01) [H03F 3/005 (2013.01); H03F 2203/45551 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A current source circuit, comprising:
a pair of capacitors;
a switching circuit that charges one of the pair of capacitors with a predetermined charging current and transfers electric charge from the one of the pair of capacitors to another of the pair of capacitors;
an operational amplifier that amplifies a difference between a terminal voltage of the other of the pair of capacitors and a predetermined reference voltage and outputs the difference that has been amplified as an output voltage; and
an output transistor that outputs a current corresponding to the output voltage as a reference current.