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测量EMIRR的方法有很多，这里的EMIRR IN+指的是将RF信号作用在INA1620的IN+端进行测试的，datasheet中有相应的描述：
Measuring EMIRR can be performed in many ways, but this section provides the EMIRR IN+, which specifically describes the EMIRR performance when the RF signal is applied to the noninverting input pin of the op amp. In general, only the noninverting input is tested for EMIRR for the following three reasons:
• Op amp input pins are known to be the most sensitive to EMI, and typically rectify RF signals better than the
supply or output pins.
• The noninverting and inverting op amp inputs have symmetrical physical layouts and exhibit approximately
matching EMIRR performance.
• EMIRR is easier to measure on noninverting pins than on other pins because the noninverting input pin can
be isolated on a PCB. This isolation allows the RF signal to be applied directly to the noninverting input
terminal with no complex interactions from other components or connecting PCB traces.
