Thanks for watching. For more analog circuit videos see: PhotoDiode Amplifier with Data Compression Explained th-cam.com/video/hqrRx2ufAwg/w-d-xo.html Amplifier with -25 to 55 dB Attenuation-Gain range th-cam.com/video/oyz6lTGd2Xo/w-d-xo.html Thermometer Circuit Design with Op Amp & BJT transistor th-cam.com/video/55YsraFE0rg/w-d-xo.html Electronic Gain Control for Op Amp Amplifier th-cam.com/video/NoNgQpbj77Y/w-d-xo.html Instrumentation Amplifier with Electronic Gain Control th-cam.com/video/C4tghZ-q6Zs/w-d-xo.html Power Amplifier Design (Class A) with Transformer th-cam.com/video/gKlJrqGqeCI/w-d-xo.html VCA Electronic Gain Control (Part 1): Voltage-Controlled Attenuator Overview th-cam.com/video/cFzYZsPEtP0/w-d-xo.html Analog Multiplier Circuit th-cam.com/video/VP53A2zpVMQ/w-d-xo.html Push-Pull Power Amplifier Design with Op Amp, Sziklai Darlington Transistors th-cam.com/video/8BFzsi7-Vbs/w-d-xo.html Analog Vector Summer Circuit Design with Op Amp and BJT Transistors th-cam.com/video/PIAsa0QNVns/w-d-xo.html Op Amp Analog Computer Differential Equation Solver th-cam.com/video/ENq39EesfPw/w-d-xo.html Push-Pull Power Amplifier with Darlington Transistors th-cam.com/video/866MYibo8yE/w-d-xo.html Sallen-Key Analog Filter Design Tutorial th-cam.com/video/KwUnQXbk7gM/w-d-xo.html And the Analog Circuits Video playlist: th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html I hope these Circuit design and analysis videos are interesting.
Thanks for great videos. Photodiode receivers often have to operate at high frequencies, often many GHz. How can you compensate for the capacitance of the photodiode witch become significant at high frequencies even below 1 pF. Also, since the signal is an RF signal, can you make a diagram using current feedback and an output with z=50Ω. Could you recommend components?
You are welcome. Glad that you liked this video. The photodiode amplifier presented here is not suitable for Giga Hertz communications. The fastest commercially available Op Amps have gain-bandwidth product (GBW) of 8 to 10 GHz enabling them to operate in closed-loop feedback on signals up to few hundred MHz modulated on optical career that is received by the photodiode. I hope this is helpful.
Thank you! Depends on your target application and specific wavelength. But generally speaking MTD8600N4 is an NPN phototransistor with peak photo response at 880 nm and spectral sensitivity of visible to near Infrared (400 to 1100 nm). To see a large selection of phototransistors pls also check www.vishay.com/en/photo-detectors/phototransistor/ and www.digikey.com/en/products/filter/phototransistors/544 . More amplifier examples are in my analog circuits Playlist th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html . I hope this is helpful.
You will not be able to use this circuit for high current (you mentioned 1A at time 13:00) , since the first op-amp is the one that drives the current.
Thank you for your interest in this circuit and for sharing your thoughts. You have a good point that for high-current scenarios extra care is needed. Either the first Op Amp output needs to be able to handle the target current or an easy mod would be the first Op Amp driving the base of a high-current BJT transistor whose emitter is driving the common node of R2 and R3 resistors. Thanks again :)
Thanks for watching. For more analog circuit videos see:
PhotoDiode Amplifier with Data Compression Explained th-cam.com/video/hqrRx2ufAwg/w-d-xo.html
Amplifier with -25 to 55 dB Attenuation-Gain range th-cam.com/video/oyz6lTGd2Xo/w-d-xo.html
Thermometer Circuit Design with Op Amp & BJT transistor th-cam.com/video/55YsraFE0rg/w-d-xo.html
Electronic Gain Control for Op Amp Amplifier th-cam.com/video/NoNgQpbj77Y/w-d-xo.html
Instrumentation Amplifier with Electronic Gain Control th-cam.com/video/C4tghZ-q6Zs/w-d-xo.html
Power Amplifier Design (Class A) with Transformer th-cam.com/video/gKlJrqGqeCI/w-d-xo.html
VCA Electronic Gain Control (Part 1): Voltage-Controlled Attenuator Overview th-cam.com/video/cFzYZsPEtP0/w-d-xo.html
Analog Multiplier Circuit th-cam.com/video/VP53A2zpVMQ/w-d-xo.html
Push-Pull Power Amplifier Design with Op Amp, Sziklai Darlington Transistors th-cam.com/video/8BFzsi7-Vbs/w-d-xo.html
Analog Vector Summer Circuit Design with Op Amp and BJT Transistors th-cam.com/video/PIAsa0QNVns/w-d-xo.html
Op Amp Analog Computer Differential Equation Solver th-cam.com/video/ENq39EesfPw/w-d-xo.html
Push-Pull Power Amplifier with Darlington Transistors th-cam.com/video/866MYibo8yE/w-d-xo.html
Sallen-Key Analog Filter Design Tutorial th-cam.com/video/KwUnQXbk7gM/w-d-xo.html
And the Analog Circuits Video playlist: th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html I hope these Circuit design and analysis videos are interesting.
Thanks for great videos. Photodiode receivers often have to operate at high frequencies, often many GHz. How can you compensate for the capacitance of the photodiode witch become significant at high frequencies even below 1 pF. Also, since the signal is an RF signal, can you make a diagram using current feedback and an output with z=50Ω. Could you recommend components?
You are welcome. Glad that you liked this video. The photodiode amplifier presented here is not suitable for Giga Hertz communications. The fastest commercially available Op Amps have gain-bandwidth product (GBW) of 8 to 10 GHz enabling them to operate in closed-loop feedback on signals up to few hundred MHz modulated on optical career that is received by the photodiode. I hope this is helpful.
Nice, any suggestions for a phototransistor as the detector?
Thank you! Depends on your target application and specific wavelength. But generally speaking MTD8600N4 is an NPN phototransistor with peak photo response at 880 nm and spectral sensitivity of visible to near Infrared (400 to 1100 nm). To see a large selection of phototransistors pls also check www.vishay.com/en/photo-detectors/phototransistor/ and www.digikey.com/en/products/filter/phototransistors/544 . More amplifier examples are in my analog circuits Playlist th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html . I hope this is helpful.
@STEMprof thank you, certainly a large list of interesting circuits & analysis you provide.
You are welcome.
You will not be able to use this circuit for high current (you mentioned 1A at time 13:00) , since the first op-amp is the one that drives the current.
Thank you for your interest in this circuit and for sharing your thoughts. You have a good point that for high-current scenarios extra care is needed. Either the first Op Amp output needs to be able to handle the target current or an easy mod would be the first Op Amp driving the base of a high-current BJT transistor whose emitter is driving the common node of R2 and R3 resistors. Thanks again :)
Thank you.
You are welcome. More circuit examples are in my Analog Design Videos Playlist th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html
i like negative, not positive
Are you positive about that? 😉
😄🙋♂️
👍