...大器；噪声匹配；输入阻抗匹配 [gap=694]Keywords：CMOS;cascode;low noise amplifier;noise matching;input resistant matching ...
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方法①提高整体电路共模输入阻抗以消除皮肤接触阻抗匹配失衡；
Methods High common mode input impedance of the circuit is used to remove the interference due to imbalance electrode impedance.
由于该天线的输入阻抗随频率而变化，需要用一个宽带变负载阻抗匹配网络来实现天线与电台之间的匹配。
The impedance matching network of changeable load and wide-belt is required because the input impedance of spiral antenna changes with frequency.
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