| 摘要 |
PURPOSE:To attain single setting between a DC operating point and a voltage gain by connecting a constant current circuit having nearly the same current value to each of an emitter and a collector of transistors (TR) and providing a DC level setting means to the collector. CONSTITUTION:In flowing an equal current I0 to the constant current circuit comprising TRs 15, 16, 17 and resistors 18, 19 and the constant current circuit comprising TRs 12, 11, 7 and resistors 14, 13, 9, a current flowing out to an output terminal 24 and a current flowing from the output terminal 24 are nearly zeroed. In this case, the voltage gain is decided by deciding a collector current of a TR3 and a resistor 22, and a DC level V24 at the output terminal 24 is decided by deciding a voltage V23 at a DC level setting terminal 23 and a resistor 21. |
