许多应用场合需要在有环境光的情况下用光电二极管测量光信号。为了消除环境光变化而造成的假信号,常用的办法是用遮光罩把光电二极管与环境光隔离开来。另一种办法是利用直流恢复电路来抵消低频环境光的影响,具体如本电路所示。 Burr-Brown公司的OPT201是集成的光电二 Many applications require photodiodes to measure optical signals in the presence of ambient light. In order to eliminate the glitch caused by the change of ambient light, a commonly used method is to isolate the photodiode from the ambient light with a light shield. Another approach is to use DC recovery circuit to offset the impact of low-frequency ambient light, as shown in this circuit. The OPT201 from Burr-Brown is an integrated photodiode