| 摘要 |
PURPOSE:To decrease the number of circuit elements of a level discriminator by connecting one of two signal lines to a gate electrode of an FET and the other line to the 1st electrode, and connecting the 2nd electrode to a voltage source of a fixed level and to a Schmitt trigger circuit via a load resistance. CONSTITUTION:For a level discriminator 60, a signal line L1 out of those lines L1 and L2 serving as comparators and having potentials varying approximately in a range of power supply voltage is connected to the gate electrode of an n channel MOSFET61. While the other line L2 is connected to a source electrode serving as the 1st electrode of the FET61. While a drain electrode serving as the 2nd electrode of the FET61 is connected to a constant voltage source VCC via a load resistance 62. The drain electrode of the FET61 of this comparator is connected an input part of a Schmitt trigger circuit 63 which outputs its input after inversion.
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