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交调与互调的区别
2022-06-30 15:33:00 【Micro_ET】
在射频领域中,射频器件的衡量指标多种多样,也会存在交叉模糊的指标,比如交调与互调的区分在实际的使用中存在界限模糊的情况,因为这两个指标指的都是输入信号的干扰引起输出端的信号干扰,共同点是都属于非线性指标,互调一般是在测试时输入两个信号,其中一个为大信号,另一个为小信号,看在输出端出现的相互调制状态,来判断信号的互调性能,而交调则是输入的两个信号为同幅等相的信号,看在输出端出现的混频现象,一般在基波信号的两侧信号较强,这个相邻基波的信号即为三阶交调,而且因为是带内,所以是滤除不掉的,这个只能靠管子的本身性能来决定,但在某些地方也用互调来表示该指标。另外交调点是推大信号的预测值使用。仅供参考!
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