The invention discloses a coupled reverse current source graph processing system based on constant-current protection. The coupled reverse current source graph processing system consists of an image sensor, a driving circuit which is connected with the image sensor, a processing circuit which is connected with the driving circuit, an emitter coupled asymmetrical trigger circuit which is connected with the processing circuit, a precision reverse current source circuit which is connected in series between the driving circuit and the processing circuit, a light beam excitation logical amplifying circuit which is connected in series between the emitter coupled asymmetrical trigger circuit and the driving circuit, a logical protection emitter coupled amplifying circuit which is connected in series between the light beam excitation logical amplifying circuit and the driving circuit, and a constant-current protection circuit which is connected in series between the driving circuit and the logical protection emitter coupled amplifying circuit. The constant-current protection circuit can be used for locking the working current of the graph processing system, so that the working current of the graph processing system is kept within a certain range, and image signals are protected from being influenced by current fluctuation in a processing process.
Coupled reverse current source graph processing system based on constant-current protection