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Questions tagged [photodiode]

A photodiode converts light to an electric current.

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40 views

Using a photodiode to detect the frequency of and LED

So I am working on a project where I need to create a sensor to detect four different LED beacons which will each blink at a unique frequency of 100Hz, 200Hz, 300Hz or 400Hz. The max range at which ...
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1answer
33 views

PIN diode in RF switching vs. PIN diode used as photodiode

From what I understand, there are traditional photodiode components that are designed with PIN diodes, in which the gate is activated by light saturation. For a PIN diode component made for RF ...
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3answers
84 views

Are IR emitter frequencies adjustable? Can modulation of the emitter variate material absorption properties?

A common LED emitter, Gallium Arsenide, apparently has a wavelength of about 760 nm. Then on the receiving end, there is a filtering circuit to eliminate ambient IR and to demodulate the message. Can ...
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3answers
71 views

Photodiode gate circuit noise

I'm building a chronometer for high speed projectile speed measurement. Currently i'm in the process of designing the projectile detection gate. It needs to be able to detect obstructions in light for ...
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0answers
46 views

Charge accumulation in photodiode amplification circuit

I'm using an op amp to read a photodiode as pictured here: This is used to detect a 5mw laser diode from a few feet away. The problem is that the circuit appears to accumulate the charge (not sure ...
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1answer
57 views

visible light communication data reception

My project is on visible light communication. I use a 555 timer circuit to modulate data with 200 KHz signal using a 3 watt LED. At the receiver I use a photodiode (PS100-6-CER2PIN First Sensor ...
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5answers
759 views

Infrared LED and Photodiodes

I am currently working on a project that uses an IR LED and a photodiode in a proximity sensor configuration (shown below). My question is, I have read some sites that state that your human body ...
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1answer
31 views

Can a photodiode tolerate a reverse bias beyond its specification

While searching a literature related to my experiment I come across this paper https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4424026/pdf/PP_PP201500119.pdf . On the page 27 under the section SRS ...
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2answers
103 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 ...
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2answers
67 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 ...
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0answers
50 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 ...
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1answer
50 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 ...
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3answers
51 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 ...
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1answer
28 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....
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1answer
74 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-...
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0answers
23 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 ...
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1answer
111 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 ...
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1answer
54 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 ...
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2answers
88 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 ...
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2answers
67 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 ...
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1answer
68 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://...
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0answers
103 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 ...
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2answers
155 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 ...
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1answer
68 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 ...
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1answer
61 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 ...
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2answers
162 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. ...
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2answers
102 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 ...
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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 ...
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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 ...
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0answers
74 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 ...
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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 ...
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2answers
117 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 ...
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1answer
96 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. ...
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1answer
96 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) ...
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0answers
74 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 ...
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2answers
225 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-...
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1answer
111 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 ...
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1answer
26 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 ...
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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 ...
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1answer
42 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 ...
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2answers
47 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, ...
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1answer
98 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 ...
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2answers
195 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 ...
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1answer
64 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 ...
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1answer
149 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 ...
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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 ...
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2answers
71 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 ...
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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 ...
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1answer
72 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?
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0answers
39 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 ...