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引言本文确定两种常用环路即平方环和科斯塔斯环的性能。它们在通讯工程中用于:1)解调双边带抑制载波模拟信号;2)在传输数字调制信号的相位相干接收机中提取载波或付载波参考信号。参考文献[1]确定了图1和图2所示两种电路,在环路滤波器增益为1,即一阶环路情况下的非线性特性。本文将这些结论推广到高阶参考
Introduction This article identifies the performance of two common loops, the square loop and the Costas loop. They are used in communications engineering to: 1) demodulate double sideband suppressed carrier analog signals; and 2) extract or subcarrier reference signals from a phase coherent receiver transmitting digitally modulated signals. Reference [1] has confirmed two kinds of circuits shown in Fig. 1 and Fig. 2, the non-linear characteristic under the loop filter gain of 1, namely first-order loop. This article extends these conclusions to higher-order references