| 摘要 |
<p>PURPOSE:To enable an optical signal to be used as an input signal externally transmitted to a semiconductor device while abating the effect of external electric noise and enhancing the freedom of design by arbitrary arrangement of photodetector by a method wherein an input part of the semiconductor device is provided with a photodetector. CONSTITUTION:A photodetector 16 is provided on an input part 15 on a silicon substrate 3. Besides, a reference voltage terminal 11 is impressed with a reference voltage V1. A light emitting element 18 is provided on a peripheral device 17 while another reference voltage terminal 12 is impressed with another reference voltage V2 through the other channel different from the channel for the reference voltage V1 to a semiconductor device 14. The light emitting element 18 and the photodetector 16 may be arranged oppositely or an optical signal A may be led to the photodetector 16 by optical fiber, etc. The photodetector 16 receiving the optical signal A converts the optical signal A into electric signal E1 in voltage level corresponding to the light intensity. This voltage level of electric signal E1 is determined conforming to the reference voltage V1 of the reference voltage terminal 11 of semiconductor device 14. Finally the electric signal E1 is inputted to the main circuit 2.</p> |
