| 摘要 |
<p>An inverter circuit (la) has first and second voltage supply lines (2 and 3), an input signal line signal (I) to be inverted and an output signal line (5) for supplying an inverted output signal (I). A transistor (Ql) has a first main electrode (s) coupled to the first voltage supply line (2), a control electrode (g) coupled to the input signal line 4 and a second main electrode (d) coupled to the output signal line (5). A load device (L) coupling the second main electrode (d) of the transistor (Ql) to the second voltage supply line (3) is in the form of a photosensitive element (Dl,D2) which is illuminated during operation of the inverter circuit so enabling a high output impedance load to be provided without having to use complementary transistors. <IMAGE></p> |
