In electronics, a device that restrictsthe amplitude of a signal to a predetermined threshold level. Limiters may act on positive or negative values of a signal, or both.

• 电子学中使用的一种器件，能把信号的幅度限制在预定的阀电平上，可以使信号正向限幅，也可以使信号负向限幅或双向限幅。