与正向偏置相比，交换电源的正、负极位置，即P区接电源负极，N区接电源正极，就构成了PN结的反向偏置。
这种叫做反向偏置的状态不利于电流穿越结。
This condition, known as reverse bias, is not conducive to current flow through the junction.
APD的增益可以由反向偏置电压的幅度来控制。
The gain of the APD can be controlled by the magnitude of the reverse bias voltage.
通过施加规定的反向偏流，然后测量二极管两端的电压，即可测得反向偏置电流。
Measure the reverse breakdown voltage by sourcing a specified re verse current bias, then measuring the voltage drop across the diode.
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