请问hybrids到底是什么啊？怎样用电路来实现啊？

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Differential two-ports in general and differential amplififiers in particular are widely used in RF design for obvious well-known reasons. This includes better supply rejection, lower second-order nonlinearity, and higher swings among other advantages. On the other hand, most signal
generators and network analyzers available to characterize our circuits are single-ended.
Typically external single-ended to differential hybrids are exploited to measure such circuits.