| 摘要 |
PURPOSE:To easily set a threshold level by decreasing the adjusting part of a resistance, adjusting the center bias of the threshold level by the voltage dividing point of the resistance, and increasing or decreasing its width by the current of a current source. CONSTITUTION:An operational amplifier A1 discriminates and amplifies the upper waveform of an input wave IN by a prescribed threshold level and outputs it as a square wave to an output terminal 3. In the same way, an operational amplifier A2 discriminates and amplifies the lower waveform of the input wave by a prescribed threshold level and outputs it as a square wave to an output terminal 4. In this case, an adjustment of the center bias of the threshold level is synchronized with an input bias and executed by variable resistors R1, R2, and the threshold level of the upper waveform and the lower wave form can be adjusted easily. In such a way, the threshold can easily be set.
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