DC transmission ratio

In optocouplers, the direct current transfer ratio (CTR = Current Transfer Ratio) indicates the ratio between output and input current for direct current signals or low signal frequencies . For optocouplers with a photodiode it is 0.001–0.005 of the input current, for optocouplers with a phototransistor 0.4–10000, in special cases considerably more.

${\displaystyle CTR={\frac {I_{C}}{I_{F}}}={\frac {Ausgangsstrom}{Eingangsstrom}}}$

literature

• Ulrich Tietze, Christoph Schenk, Eberhard Gamm: Semiconductor circuit technology . 11., completely reworked. and exp. Edition. Springer, Berlin / Heidelberg 1999, ISBN 3-540-64192-0 .