| 摘要 |
PROBLEM TO BE SOLVED: To provide a current-voltage converting circuit stabilized in frequency characteristics over wide band range. SOLUTION: This circuit is composed of a transistor 5 to connect a photodetector PD to its base, resistor R3 connected to the collector of the transistor 5, transistor 7 connecting its base to the collector of the transistor 5 and connecting its emitter to the base of the transistor 5 and resistor R4 connected to the collector of the transistor 7, and the collector voltage of the transistor 7 is defined as an output voltage Vout. |
