tongkin Posted September 17, 2009 Report Share Posted September 17, 2009 Greeting,In order to get photo current, is it need to apply reverse bias to the photodiode. Or it can use only the internal potential barrier to swept the EHPsthank Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 17, 2009 Report Share Posted September 17, 2009 A photo diode can be used to leak a tiny current when it is reverse-biased and light shines on it or it can be used as a solar cell when it generates a tiny voltage and current.When it is reverse-biased it switches faster because the reverse voltage reduces its capacitance. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted September 17, 2009 Report Share Posted September 17, 2009 What are EHPs?A simple transimpedance amplifier can be made using an op-amp and a resistor. Quote Link to comment Share on other sites More sharing options...
tongkin Posted September 18, 2009 Author Report Share Posted September 18, 2009 A photo diode can be used to leak a tiny current when it is reverse-biased and light shines on it or it can be used as a solar cell when it generates a tiny voltage and current.When it is reverse-biased it switches faster because the reverse voltage reduces its capacitance.So, it can produce current with out any bias voltage, right? Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 18, 2009 Report Share Posted September 18, 2009 So, it can produce current with out any bias voltage, right?Yes.But since its area is very small then its generated current is also very small. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted December 17, 2009 Report Share Posted December 17, 2009 Are photodiodes really diodes? The architecture is different and light is such a weak source of power. Photocouplers are integrated into a single device so that the light source is right next to the light receiver which can be a photodiode or phototransistor. Quote Link to comment Share on other sites More sharing options...
Guest garyson Posted June 10, 2013 Report Share Posted June 10, 2013 A photodiode is a type of photodetector capable of converting light into either current or voltage, depending upon the mode of operation Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.