利用该结构，能够在电光调制器中实现完全对称的推挽操作。
With this structure, full symmetric push pull operation can be realized in modulator.
的缺点B级操作大量的“交越失真” ，这发生在一个管推挽对切断和其他打开。
The disadvantage of class B operation is a large amount of "crossover distortion", which occurs when one tube of the push-pull pair cuts off and the other turns on.
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