| 摘要 |
PURPOSE:To make an amplitude level of a negative output signal of a limiter variable with respect to a negative input signal by connecting a resister varying an output level with respect to the negative input signal between the emitter of the common emitter transistor(TR) of the 2nd stage and one terminal of a feedback bias circuit. CONSTITUTION:A resistor R5 is inserted between the emitter of a TR 4 of a 2nd stage of a common emitter 2-stage direct coupling amplifier circuit 1 and a collector of a TR of the diode connection of a feedback bias circuit 2. Thus, the limit level of the amplitude of an output signal V0 is varied in the range of (IE, R5) when an input signal Vi is negative by varying the resistor R5. Then the amplitude of the output signal of the limiter amplifier circuit is changed accordingly. |
