Rotation angle sensing circuit for angle encoder

The purpose of the present invention, which relates to a rotation angle sensing circuit for an angle encoder, is to provide a rotation angle sensing circuit for an angle encoder, which allows the rotation angle of a crankshaft to be precisely sensed by improving resolving power. To this end, the rotation angle sensing circuit for an angle encoder according to one embodiment of the present invention, which is applied to an angle encoder attached to the crankshaft of an engine and outputs, as voltage signals, the rotation number and angle of the crankshaft by comparing/detecting light emitted from the light-emitting unit of the angle encoder, comprises: a sensing unit for sensing the light emitted from the light-emitting unit through a plurality of channels, converting same into electrical signals, and then outputting the signals to output pins, the number of which corresponds to the channels; a comparison/detection unit comprising a plurality of comparators for receiving as inputs, comparing, and outputting tw