| 摘要 |
PURPOSE:To observe signals on plural signal lines at one output terminal by using gate electrodes of >=1 insulating gate type field-effect transistors (FET) as input electrodes, connecting them to corresponding signal lines and observing the signals. CONSTITUTION:The sources and drains of N channel insulating gate type FETs 6-9 are connected in parallel; and a DC bias power source 10 is connected to the sources and an ammeter 11 is connected to a DC bias power source 10. Then, the signals on four signal lines are inputted to the gates of the FETs 6-9 through input terminals 1-4. If the signal inputted from the input terminal 1 is ''1'', the drain current of the FET6 is 8I, and those of other FETs are 4I, 2L, and I respectively. The current of the ammeter 11 connected to an output terminal 5 is therefore the total of the drain currents of the FETs 6-9 and the signals on the plural signal lines are observed at one output terminal. |
