Dear Experts,
I am working on a project related to transmission signal between LED and Photodiode.
1. About transmitter:
- Use a high power LED to transmit a square wave in frequency range from 1kHz to 10kHz.
2. About receiver:
- Use a high speed PD (datasheet in attached file)
- Use a high speed Op Amp (OPA354) in Transimpedance mode for the 1st stage.
- Use a common Op Amp (LM2904) in non-inverting mode to amplify output of the 1st stage.
Pls, see circuit and datasheets in attached files.
But I have a problem when I transmit signal on high distance 1.2m. It seems to be disappeared 1 period in timeline (see photo).
Please, help me to find out what is going on with my received signal.
Thanks a lot!
I am working on a project related to transmission signal between LED and Photodiode.
1. About transmitter:
- Use a high power LED to transmit a square wave in frequency range from 1kHz to 10kHz.
2. About receiver:
- Use a high speed PD (datasheet in attached file)
- Use a high speed Op Amp (OPA354) in Transimpedance mode for the 1st stage.
- Use a common Op Amp (LM2904) in non-inverting mode to amplify output of the 1st stage.
Pls, see circuit and datasheets in attached files.
But I have a problem when I transmit signal on high distance 1.2m. It seems to be disappeared 1 period in timeline (see photo).
Please, help me to find out what is going on with my received signal.
Thanks a lot!
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