| 摘要 |
PURPOSE:To realize an analog voltage discriminating circuit using a small number of elements, by constituting it so that plural diodes are connected between plural analog voltage input terminals and its common connecting point, respectively. CONSTITUTION:One end of a discharge type current power supply 18, and the other end are connected to an electric power supply 19 and the anode side of a diode 20, respectively. To this connecting point 21, a positive input terminal of an impedance converting amplifier 22 is connected. A negative input terminal of this amplifier 22 operates as a voltage follower. The cathode of the diode 20 is connected to one termonal of a suction type current source 23, and the other terminal is connected to a ground end 24. Also, the cathodes of diodes 25-27 are connected to the cathode of the diode 20. According to such a constitution, for instance, the maximum value of analog voltage of a lot of inputs whose temperature has been compensated is outputted to an output terminal 29. Accordingly, an analog voltage discriminating circuit can be realized by use of a few number of elements. |
