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下载“第Ⅴ章:光半导体” (PDF:1.8MB)
第3步:设计输出侧电阻RL
根据输出晶体管的IC-VCE特性确定RL。为了用于信号传输,必须完全满足连接到负载侧的器件的“L”电平。
这里,我们设置VCE=0.3V作为目标值。
当RL=1kΩ时,IF=10mA,VCE=0.9V,这无法满足目标值。当RL=2kΩ时,VCE=0.2V左右,这可以满足目标值。因此,选择RL=2kΩ。在实际设计中,还必须考虑负载侧的阻抗。