| 摘要 |
PURPOSE:To select different limiter levels by providing amplitude limiting circuits to a circuit which does not require any operational amplifier used exclusively for limiter level setting. CONSTITUTION:A changeover switch 40 for switching the output of a voltage- current converter 33, amplitude limiting circuits 41 and 42, and resistance 51-53 are provided. Then, a resistance 51 is connected between the inverted input terminal of an operational amplifier 25 and an output terminal 22; and one terminal of a resistance 52 is connected to the inverted input terminal of the amplifier 25 and the other terminal is connected to one terminal of the limiting circut 41 and a changeover terminal (a) of the switch 40. One terminal of a resistance 53 is connected to the other terminal of the resistance 52 and the other terminal is connected to one terminal of the limiting circuit 42 and a changeover terminal (b) of the switch 40. Further, the other-side terminals of the limiting circuits 41 and 42 are connected to the output terminal 22. Thus, different limiter levels are set selectively through the switching operation of the switch 40. |
