| 摘要 |
PURPOSE:To perform the measurement and the like of the characteristics of a diode which needs two power sources, i.e., a constant voltage power source and a constant current power source in a simple circuit constitution by employing two differential input type amplifiers comprising operation amplifiers as inverted type amplifiers. CONSTITUTION:When switches S1 and S2 are turned to a and a', a current value IF flowing in the diode under test 10 becomes -VIN/R7, and an output voltage VS from a voltage follower 2 becomes a forward voltage VF. When the switches S1 and S2 are turned to (b) and (b'), the voltage applied to the diode 10 becomes VR= -V1. A leakage current IR, which flows into a resistor 8, can be obtained by reading the voltage across the resistor 8 by using IR=VS/RS. Therefore, the voltage value to be applied to the diode 10 is defined by the input voltage value VIN in measuring the leakage current, and said leakage current IR can be readily measured by reading VS at this time. |
