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晶体管耦合器可以传输的信号频率是多少？
可传输数字信号的频带宽度取决于如何选择LED电流IF和负载电阻。这还取决于电流传输比（CTR）的高低程度。对于晶体管耦合器，由于传输延迟时间的实际值在几十微秒（μs）范围内，因此带宽在每秒几千比特到十几千比特的范围内。
有关详情，参阅东芝应用说明《Basic Characteristics and Application Circuit Design of Transistor Couplers》第2-4-3节“Setting of Pull-up Resistance RC(max) ”和第2-4-4节“Setting of Pull-up Resistance RC”。
（https://toshiba.semicon-storage.com/cn/semiconductor/knowledge/application-note.html）