A photodiode converts light to an electric current.
2
votes
2answers
77 views
High-speed Infrared UART link with photodiode
I need short-distance (about few centimeters) wireless IR UART link with 250k+ baud. I tried to use phototransistor (assume Q1 is phototransistor). Q3 is used to prevent inverting signal.
simulate ...
1
vote
2answers
57 views
Noisy amplification and low light: photodiode and op-amps question
My formal education was in mechanical engineering and I’m well trained in some CS as well. Yet here I am on an electrical project (that will eventually turn CS). I have been lost and confused for many ...
0
votes
0answers
37 views
Advantages and disadvantages of voltage output vs. current output PMT modules
Context: I am building a custom right-angle static light scattering setup to measure aggregation of biomolecules in aqueous solution. I need the instrument to be as sensitive as possible, to allow ...
0
votes
1answer
46 views
Filtering current spikes in photodiode transistor selector
I am building a circuit for sensing photocurrent from a photodiode. The diodes are manufactured with selection transistors to form an active matrix and below is a model of a single pixel consisting of ...
2
votes
3answers
48 views
Photodiode selection for fluorescent probe [closed]
At the moment I am trying to build a DIY fluorescence detector using the Amplex Ultra Red probe with excitation and emmission maxima at 568 and 581nm respectively.
I just have problems choosing the ...
0
votes
1answer
24 views
Photodiode Trans impedance amplifier design
Am designing a trans impedance amplifier for photodiode from first sensor PS-100E.Am using LM 358 op-amp.To calculate the feedback resistance ,I should know the short circuit current of the photodiode....
0
votes
1answer
59 views
Amplifying current from a photodiode
i'm coming back from my previous post, to give some futher details: here's my problem:
We're going to supply power to a 4-motors drone with one/several photodiods.
Here are the characteristics:
4-...
1
vote
0answers
21 views
Analyzing pinout of photodiode in a ic
I have dissasembled a pick up head from a CD Rom. I can control the laser and but I also want to "read" the photodiode that senses the light reflected back. It is packaged in a clear plastic and has 8 ...
0
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0answers
81 views
Transimpedance amplifier PCB layout
I'm trying to replace an avalanche photodiode board + external voltage amplifier combination that suffers from RF pickup due to cabling between the diode and the amplifier as well as low bandwidth due ...
0
votes
1answer
50 views
Photodiode scintillation detector for gamma spectroscopy
I'm trying to build a basic detector for x-ray or low energy gamma spectroscopy. I have a big photodiode with a CsI(Tl) scintillation crystal glued on top (Hamamatsu S8559 for x-ray detection [1]) and ...
1
vote
2answers
85 views
Working with RF Amplifiers for the first time
I'm designing a circuit to use an IF amplifier, specifically the ADL5536, to amplify the signal of an SiPM array consisting of the MicroFJ-60035 TSV SiPM by SensL. My goal is to use this amplifier to ...
3
votes
2answers
62 views
What is this? Identifying Proximity Sensor Chip (IR)
I am in a bit of a pickle. If anyone could help/has any ideas I will be very grateful - am aware this post is pretty long but thought if anyone was clever enough to know it would be you guys. If ...
0
votes
1answer
54 views
Photodiode + OpAmp + Arduino: Further Amplification
In order to measure the concentration of a methylene blue dye in water, I am using a 660nm high power LED and a photo diode with op amp setup as described here (schematic below):
https://...
0
votes
0answers
86 views
Photodiode Amplifier Circuit Design
I'm working with a mid-infrared (~4um) photodiode model Lms43PD-03-CG (Datasheet) and a matching LED (Datasheet). (I can't switch from this photodiode/LED pair) I'm trying to make a functioning ...
1
vote
2answers
103 views
Equivalent circuit of a photodiode
What can I learn from an equivalent circuit model of photodiode like the following?
I've actually gone the whole way beginning from doping semiconductors through each noise term to the amplification ...
0
votes
1answer
61 views
Photodiode amplifier gain question
I'm currently designing a circuit to convert an infrared signal (e.g. from an IR transmitter or a TV etc. remote control) and turning it into an audio signal. The first stage of the preamplifier is ...
1
vote
1answer
44 views
Diode modeling in verilog a
I am modeling a diode using verilog ams but I have a problem when I simulate its behaviour in different temperatures.
The simple equation of the diode (Id=IS∗(eVd/Vt−1)) is not enough because it ...
1
vote
2answers
112 views
Bootstrapped Transimpedance Amplifier (TIA) - High Frequency Instability
I have constructed transimpedance amplifier in the hopes to achieve both high-gain (5kΩ) and high-bandwidth (50MHz) performance using the FGA21 photodiode, the OPA657 Op-Amp and the 2N2369 Transistor. ...
0
votes
2answers
93 views
How do I amplify the output current from a photodiode? (In photovoltaic mode)
I explain my self: we're going to make a photovoltaic cell with severals photodiods in series. Problem: the current isn't really high (I'm in photovoltaic mode, so no external biais source).
I've ...
0
votes
2answers
56 views
covering sides of LEDS without adding heat
I'm doing a project in which a 5mm LED is near a 5mm phototransistor. There are times in which the sensor must pick up external light even with the LED on.
I understand one option is to turn the LEDs ...
1
vote
1answer
59 views
Powering a power supply question
I purchased an amp for photodiodes from Amazon. It came with a 5v power supply. I am powering it with a 9v battery
Everything seems to be working okay, but when I measure the voltage leaving the ...
0
votes
0answers
71 views
Whats going on with my transimpedance amp?
Pulling my hair out with this design. I have the following design which was done using analog devices Photodiode Circuit Wizard tool so it should work. The current source in the schemeatic is the ...
9
votes
3answers
1k views
Why do we use an opamp to produce a voltage output above 1V in this circuit?
I wonder what advantages (regarding noise or other important factors) the opamp circuit:
holds over a circuit consisting of only a photodiode and a resistor (the resistor has to be placed where the ...
0
votes
2answers
97 views
Photo-diode for a high-frequency tachometer
I intend to build a tachometer, which is capable of detecting rotations up to 1kHz (60 000 RPM). From the Internet I know that this is possible to do with a magnet and a Hall detector. However, I ...
0
votes
1answer
90 views
Is there any color sensor that reads R,G,B and Clear channel values in parallel? [closed]
Currently, I'm using a color sensor TCS3200 it has 8x8 photodiode array, of which 16 are RED filtered, 16 are Green filtered,16 are Blue and 16 are clear. I can read one color channel at a time i.e. ...
0
votes
1answer
73 views
Transimpedance amplifier transfer function
I am learning analog design. I am trying to understand transimpedance amplifier using Op-Amp. Here is my transfer function.
My understanding is assuming Node Va as virtual group I got (Vout= -Iin*Rg) ...
1
vote
0answers
65 views
OPT301 Photodiode Output Measurement
I am working on a setup where OPT301 is fed with an optically filtered light output yield a very low current which is then Current to Voltage converted by integrated op-amp within the device, but the ...
0
votes
2answers
183 views
How do I connect an avalanche photodiode to an Arduino Uno?
I understand that there was one other question regarding avalanche photodiodes, however I am looking more for connecting my APD to a microcontroller (Arduino).
https://www.edmundoptics.com/testing-...
2
votes
1answer
101 views
Photodiode sensing circuit with inverted output
I want to build a photodiode light sensing circuit so that the output voltage is inversely proportional to the light intensity going to the photodiode. I.e less light equals more voltage.
I'm ...
1
vote
1answer
21 views
principle about SPAD for ToF ranging module from ST
My colleagues are using VL53L0 from ST which is one ToF ranging module. I am trying to understand the principle about the SPAD(single-photon avalanche diode) and have read many materials on it.
From ...
-2
votes
1answer
64 views
Diagnosing Noise in Op Amp Circuit ~ 22 second peaks
I'm trying to diagnose the source(s) of noise in this op amp circuit which amplifies the signal from an OPT301M photodiode. The peaks are especially problematic and mysterious. Please excuse the ...
1
vote
1answer
41 views
+ and - 12 V power supply with 12v Batteries, How to make a ground rail with both batteries
I'm new to electronics. I want to make a battery supply to power an OPT301M {photodiode with integrated op amp} and an ADTL082 dual {op amp IC} in order to attempt to reduce noise in the circuit. I ...
0
votes
2answers
45 views
MT03-004 EDA Library
Currently working on my Honours project, we're designing a wide area sun sensor for an attitude control system of a picosatellite platform. We've elected to implement a COtS quad-photodiode package, ...
0
votes
1answer
93 views
Photodiode circuit Op Amp and amplification failure
I am trying to build a photodetector circuit to detect and amplify the output signal of a fiber laser. I started with testing my fiber pigtailed photodiode on a breadboard as shown.
simulate this ...
0
votes
2answers
157 views
High gain photodiode amplification response time
So we are trying to detect very low levels of UV light using the circuit below. One of the problems I am having is that the response time for the output at "signal" is as long as 1-2 seconds. If we ...
0
votes
1answer
43 views
Measuring forward and reverse current on a photodiode
I'm in need of a different perspective here on how to approach the circuit I'm designing. Currently I have a PD that I want to reverse bias with 2V and measure the current from the PD. This is easy ...
2
votes
1answer
133 views
Large drift (temperature could be a culprit) in this circuit. Anyone can help?
Purpose: Amplify the differential voltage out of a bi-cell photo-diode. Amplification has to have a high gain as we are looking into nm level displacements of the IR beam centroid emitting the bi-cell
...
0
votes
2answers
86 views
High Speed Light Detection in Daylight
I'm trying to create a system to detect when a set of lights trigger in drag racing to the thousandth of a second. However, all my attempts at finding cameras for a raspberry pi or arduino aren't ...
0
votes
2answers
69 views
Photodiode + Op-Amp Acting Nonlinearly
I've built a laser power meter based on a photodiode (likely a ThorLabs FDS10X10), a simple op-amp circuit (op-amp is TLV2462, max 12V), and a microcontroller+screen:
Internally, I've built the ...
0
votes
0answers
34 views
is it possible to obtain the intensity of reflected laser light from a DVD or CD-Drive?
I would like to play around with my old CD Drive and stumbled upon the idea of using the CD drive as optical detector for depth or light absorbance. Is is somehow or with some devices possible to ...
0
votes
1answer
71 views
How to build distance measuring device that can only detect red light from a common red laser
I want to make a distance measuring device. Using common red laser. what receiver should I use to detect the red laser light only? a more sensitive to red light.
Do an Arduino UNO capable of this?
1
vote
0answers
34 views
How to make MSM photodetector more selective?
I got a question, how can I make Metal-Semicondutor-Metal photodiode more selective in terms of wavenlength spectrum. I need to mention I cannot use Bragg reflectors like in RCE photodetectors. All I ...
0
votes
0answers
82 views
Op amp circuit with photodiode
I tried assembing an infrared detector circuit (image version) without really knowing how it works, and sure enough it doesn't work. The output of the circuit gives something around 50mV, with or ...
0
votes
0answers
27 views
Thin p+ side in photodiode
The diagram of the photodiode is shown below. Why is the p+ layer very thin here? Could we have used a n+p configuration instead?
1
vote
6answers
254 views
How could I amplify the output from this UV photodiode sensor
I have been able to use the following photodiode sensor board to detect changes in the output of the sensor when a UV plasma is active. However, changes sensed when the UV plasma is active are very ...
1
vote
0answers
275 views
Photodiode OP-AMP circuit for UV light radiation
The project: The aim is to be able to use the photodiode to detect plasma (radiation in the UV light spectrum). The photodiode suggested for this application is the BPX65 and I currently have access ...
0
votes
2answers
298 views
Confused with photodiode amplifier circuit
I am a beginner at elecetronic design and i would like some help with this circuit. I cannot understand how it is analysed.I know how an opamp works with a negative feedback as an inverting amplifier ...
0
votes
1answer
65 views
How to use a photodiode over a broad range of optical powers
I am using a GaAs photodiode to pick off a small amount of the light of a high-powered infrared laser, supply this to a PID loop and thus have a way to stabilize the intensity of the laser. The thing ...
0
votes
0answers
35 views
Metal-Semiconductor-Metal (MSM) diode's buffer material for 2nd telecom window
I need help with finding the best MSM diode's active material and buffer layer for detecting wavelength of 1300 nm.
I found that the active material could be: \$\rm In_{0.53}Ga_{0.47}As_{0.78}P_{0.22}...
3
votes
4answers
103 views
Help on turning starlight in to voltage
Here’s my issue. I would like to turn bright starlight into voltage. Here’s what I have done.as you can see I have placed a photodiode in a telescope eyepiece tube. I have it below the lens because ...
