关键词: 双极工艺, 大电流, 高输出电阻, 恒流源

Abstract: Based on the bipolar process, a constant current source circuit with high current and high output resistance is designed. An emitter-out structure is applied in the constant current source so that the output resistance is not sensitive to the output current, and accordingly the current source can keep a high output resistance when offering a high current. This structure is suitable for the ICs which need a constant high current, such as the active load of constant current source in the front stage of the driving stage of power operational amplifiers.

Key words: bipolar process, high current, high output resistance, constant current source