ce277c1f   
   XPost: sci.electronics.design   
   From: Nemo@nocannedmeatproducts.nosirree   
      
   Yes, some photodiodes have response times on the order of 1-2   
   microseconds. One I use, a physically large, high capacitance one   
   (~400pF under bias) is quoted as 2.5us by its manufacturers, who refer   
   to the charge carrier transit time phenomenon you mention.   
      
   I have no idea if the charge carrier transit delay is dependent on   
   current levels, but it probably isn't as photodiodes are such perfect   
   transducers. I mention it to stimulate musing from someone else.   
      
   Nemo   
      
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