High-precision current source circuit

• Main Authors: HUANG XIN, LI MENG, QIAN YONGXUE, DUAN LIANCHENG, MENG HAO, QI QIAOYUN, LU NING, DANG YANJIE, SUN PENGLIN, LI KAN, WANG PEIYAO, CAI GUANGJIE
• Format: Patent
• Language: Chinese; English
• Published: 29.04.2022
• Subjects: CONTROLLING; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

The invention provides a high-precision current source circuit which comprises a first current source circuit which comprises a first operational amplifier, a first transistor, a second transistor and a first resistor, the positive input end of the first operational amplifier is connected with a first node, the negative input end of the first operational amplifier is connected with a reference voltage node, and the negative input end of the first operational amplifier is connected with a second node; the output end of the first operational amplifier is connected with the grid electrode of the first transistor and the grid electrode of the second transistor; a source electrode of the first transistor is connected to a power supply voltage, and a drain electrode of the first transistor is connected to the first resistor through a first node; a source electrode of the second transistor is connected to the power supply voltage, and a drain electrode of the second transistor is connected with the output node throu