RF_Handbook_1dB_CompressionPoint

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1dB Compression Point

 

 

 

As you see in the plot show below, to some point the ideal operation curve and real operation curve of an amplifier is almost identical (i.e, within linear operation region) but from a certain point the real output signal gets compressed and the ideal output start diverging from the ideal (linear) curve. If you measure the divergence (the difference between the ideal line and real curve) along the operation curve, you would hit a specific point where the difference between the linear line (ideal operation line) and the real operation curve become 1 dB. That point is called 1dB compression point. Along with IP3, this point is used as an indicator showing the degree of nonlinearity of an amplifier.

1dB压缩点

 

正如您在下面所示的曲线图中所看到的，在某个点，放大器的理想操作曲线和实际操作曲线几乎相同（即，在线性操作区域内），但从某个点开始，实际输出信号被压缩，理想输出开始偏离理想（线性）曲线。如果您沿着操作曲线测量偏离度（理想线和实际曲线之间的差异），您会击中一个特定的点，在该点上，线性线（理想操作线）和实际操作曲线之间的差异变为1 dB。该点称为1dB压缩点。与IP3一起，该点用作显示放大器非线性程度的指示器。