| 摘要 |
<p>PURPOSE:To add electromagnetic-wave induction signal removing capacity to a photodetector built-in integrated circuit by forming a conductor film having a fixed capacitance value between a diode and the input side. CONSTITUTION:A P-type anode region 17 in a P-N photodiode 1 is manufactured at the same time as the formation of a base region in an N-P-N transistor constituting an integrated circuit 21 in an integrated circuit pellet 16. Region 17 itself functions as one conductor plate for a plate capacitor, and has capacitance 3 between input-output between the region 17 itself and a body shaping the input side of a photo-coupler. A light-emitting element 2 is supplied with signal currents by a signal source 14, and an in-phase noise signal source 15 can be regarded so as to be positioned between the input side of the photo- coupler and the ground. On the other hand, a conductor film 20 is shaped around the diode 1 in a pellet 16, and in-phase signal capacitance 5 is given between the film 20 and the body constituting the input side. Accordingly, outputs from current voltage converters 6, 7 are processed, and only the normal signal component of the signal source 14 can be output.</p> |
