Title: Method for raising constant-current source circuit performance
Application Number: 200610029298 Application Date: 2006.07.21
Publication Number: 1888999 Publication Date: 2007.01.03
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G05F1/46
Applicant(s) Name: Shanghai Micro-Electronic Equipment Co., Ltd. Address:
Inventor(s) Name: Chang Yibin;Tang Yong;Li Xiaoping;Shu Jianping
Attorney & Agent: wang ji
Abstract:
    The invention provides a method to improve the constant-current source circuit performance. The subtraction device is set between the reference supply and the operational amplifier. The result subtracted from the circuit current source Vcc and the reference supply is as the positive input end of the operational amplifier and the reference resistance is connected between the circuit current source Vcc and the negative input end of the operational amplifier which the output end is connected to the base of the NPN triode and the collector electrode is connected to the negative input of the operational amplifier, the charge is connected between the emitter of the triode and the current source ground. The zero potential is the reference point for the voltage of the charge to decrease the dependence of the constant-current source circuit to the current source, so it can improve the loading and anti-interference performance of the circuit.
Time: 8