An image forming apparatus is provided which includes a first image forming section for performing image formation based on monochromatic image data, and a second image forming section for performing image formation based on color image data. The invention also relates to methods for producing these inhibitors. Common mode reset is achieved by setting storage capacitors coupled to the outputs of the differential detector at least once within an integration time T before storage potential exceeds a saturation voltage Vsat for the photodetector. The input-output port and the second antenna may be located at one of the ends of the electronic device.