Questions tagged [photodiode]
A photodiode converts light to an electric current.
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Can I connect a new circuit in parallel to the existing car charging light indicator? [closed]
Here is how the LED is ON and OFF.
The led represents the BATTERY CHARGING LIGHT on a car. It has constant 12V and is a ground side switch. Whenever Key is ON, it STAYS ON. As soon as engine is ...
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Portable LED staircase light
I need to make a portable LED staircase light that uses a BPW34 photodiode. It should enable the LED driver when incoming light is below an adjustable threshold, and disable the LED driver when ...
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Photodiode arrays: how can different wavelengths be compared?
In DAD (diode array detector), aka PDA (photodiode array) detectors, the light is dispersed and different wavelengths fall onto different diodes. This allows finding out which wavelengths were present ...
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Multiplex array of photodiodes [closed]
I have a linear array of 10 photodiodes that I want to connect to a single transimpedance amplifier to produce signals.
I'm envisioning some sort of analog switching circuit (U2 in the diagram below) ...
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Photodiode detector 2-stage amplifier design
I found the post with circuit diagram I wanted to build: circuit diagram.
The resistors values, gain and filter frequency are enough for me.
I wanted to measure light intensity as DC voltage, so ...
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Feasibility of high-speed omnidirectional communication through infrared light
I am currently working on the design of a low-cost communication system based on IR LEDs and photodiodes for my research project. The goal is to transmit data with ~100ns pulses across ~0.5m distance (...
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Low intensity UV light detector
I wanted to build low light UV detector, I mean the measurement of light with wavelength 405 nm. I found two schemes:
First circuit:
And the second circuit:
I wanted to use operational amplifier ...
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Input bias current calculation
I have a VBP104FAS connected as above with the LMP7721 opamp to produce an output voltage from the photodiode's small input current. I am trying to calculate the input bias current I need as I am ...
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Transimpedance amplifier circuit with uniform light input gives a sine wave output
I am trying to build a transimpedance amplifier circuit on a PCB (as in the figure below).
Although I have run a SPICE simulation and got the desired results, I wanted to test it out on a breadboard ...
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How to improve output swing of an NMOS pixel circuit?
This is a standard pixel circuit:
It works just like one would expect. When the reset signal on the gate of the PMOS is low it is conducting and charges the capacitor to 5V, then when the signal turns ...
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DC transimpedance amplifier feedback capacitor
I am designing a simple photodiode light sensor circuit. The circuit will use a transimpedance amplifier to generate a usable voltage from the light level detected by the photodiode. The most basic ...
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500 mV p-p noise in two stage photodiode amplifier output
I have problem with power supply noise finding its way to op-amp output. Power line (+ and -) noise is 40 mV p-p. Is this due to poor pcb layout or poor filtering and what to do to make it better.
I ...
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Photodiode speed limitation
I have a system which demands optical data transmission since rotating parts are present. A mixed mechanical-electrical engineering project has led us to use photodiodes to receive data from one ...
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Can very small currents be accurately measured using only standard analog electronic components on an IC? [closed]
Let's say, for example, that I have a photodiode, which produces electrons in response to the amount of light.
What is the theoretical lower limit that can be accurately measured only using basic ...
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Why is this op-amp outputting such low voltage?
Why am I not getting the expected gain out of my op-amp?
I m using a 16-pin TI OPA4322SAIPW op-amp with a Advanced Photonix 019-141-411-R photodiode and this circuit:
where Rin is 1.8 kΩ and Rf is 27 ...
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How to use LEDs to communicate using a UART
I am using a UART to communicate between two Raspberry Pi Picos, and want to use LED / photodiode pairs rather than wires.
I have two SunLED XZMOK54W-8 610 nm LEDs paired with two Advanced Photonix ...
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Why is my SCR controlled by a photodiode pulsing when supplied with high voltage
I am working on a circuit which when a photogate (consisting of a photodiode and a corresponding LED) is interrupted, an SCR is triggered which discharges a capacitor through a solenoid. I built and ...
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Distinguish if this component is a PIN Photodiode or an APD Avalanche Photodiode
I am experimenting with a DFB Laser salvaged from a scrapped GPON Router. Laser works fine, but it comes with what looks like a "Built in InGaAsP monitor photodiode" incorporated into the ...
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Light reading diode?
I’m trying to think of a device to measure amount of UVA & UVB daylight for plants in my shed and so trying to work out what I could use to measure:
The amount of light
Its type
Its time
Be able ...
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APD (Avalanche Photodiode) Active Quenching Circuit (AQC) Waveforms & Circuit Behavior
I am reading a paper tiled Avalanche photodiodes and quenching circuits for single-photon detection
The paper presents an Active Quenching Circuit schematic, briefly describes its operation, and shows ...
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Open circuit photodiode energy
Where does a photo-diode use the energy it collects from light and other EM waves when not loaded? Does it dissipate it as heat, reflect it or something else?
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Photodiode bias in TIA?
When I see TIA schematics, I can see either the photodiode to GND or against VCC. What is the difference?
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Photodiode circuit unstable measurements on MCU ADC [closed]
I'm working on a fluoresce detection circuit. I have a lot of unstable measurements on the output of my second amplifier with the ADC. With the multimeter I have stable measurements.
How can I smooth ...
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Measuring <10 pA of photocurrent using transimpedance amplifier
I am working on a project that measures low intensity light.
The photodiode I am using an OSD35-5T. This is a large surface area photodiode. The idea is that the large surface area would absorb/...
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Photodiode amplification circuit
I'm going to build photodiode amplification circuit which is then connected to ADS1115 controlled by Raspberry Pi, it has sampling 3.3k. The operational amplifier I ...
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What is the voltage range on ADC's inputs? Photodiode + TIA + ADC
Can someone here help me understand this circuit better? It's a photodiode -> transimpedance amplifier (TIA) -> ADC.
What is the voltage range on the ADC's inputs? AIN- and AIN+.
Which input is ...
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Two identical photodiodes with same FOV but different active areas
Would two otherwise identical photodiodes (same silicon, same field of view) with different active areas illuminated by the same ambient source (ambient as in fills the entire FOV) produce different ...
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How to interpret thyristor's minimum load current?
I want to switch on/off a variable resistive load of 1mA to 150mA at 500VAC with a microcontroller.
simulate this circuit – Schematic created using CircuitLab
The chip ...
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Why there is a "Case" pin in 905nm APD?
In our research on minimizing the blockages in visible light communication using IRSs, we use a MTAPD-06-013/014/015/016-905F 905nm avalanche photodiode which has 3pins.
What is the purpose of the &...
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How to choose a phototransistor or photodiode?
I've found a photoresistor (yes, resistor, probably 30 years
old) in my scrap box, attached it to an ATtiny as ambient light
sensor, with a 100kΩ resistor as voltage divider towards +5V.
On power on, ...
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Photodiode amplifier circuit for VBP104FAS sensor
I am trying to create a photodiode circuit for this sensor so that I can connect its output to a microcontroller. I am following the document: https://www.ti.com/lit/an/sboa220a/sboa220a.pdf for my ...
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Procedure to express radiantion intensity of a LED in watts/cm^2 , given luminous intensity or total radiant power [closed]
I am calculating Responsivity of a PN junction photodiode by irradiating radiation from LED sources. For this purpose, I have two LEDs, one UV and another green LED. Note that LEDs are placed close to ...
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Ambient light sensor to a microcontroller
I am looking to make a small sensor board for something at home. I am familiar with embedded systems but my electronics knowledge may not be the best.
For my situation, I would like to connect a ...
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How to simulate non-invasive blood glucometer in Proteus?
I'm working on a project in which I'm trying to create a non-invasive blood glucometer using NIR light and a photodiode.
The glucose level is determined by the amount of light absorbed by the blood, ...
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HV Rectifier output for APD biasing
I am trying to convert low 5V or 12V to -200V using this device. Which converts it using transformer and rectifier at the output:
Can I just attach HV OUT to bias APD detectors? Or is there any ...
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Triggering generic transistors with UV or green light?
Flashes of UV light can create electron-hole pairs in transistors. Or at least reports of the "UV flash bug" claim this happens in microprocessors. People observed raspberry pies reset when ...
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If we change the PV panel, should we also change the MPPT controller block?
I have 6kw PV panel, in case of partial shading it's capacity reduces to 3kw. But, the MPPT tracker I designed it specifically for that 6kw rating, now because of partial shading the same MPPT tracker ...
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Receiver circuit design testing
I am trying to make a receiver circuit that is able to receive an LED input (further down the line receiver input from a laser).
Firstly, I am trying to test the photodiode that will be used. I am ...
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Photodiode Current Calculation for Simulation
I am designing a transimpedance amplifier and was trying to simulate the circuit to study its characteristics. I came across this online design tool provided by Analog Devices that builds the ...
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What does the VCC pin do in this Optocoupler?
I have this optocoupler, and I am trying to figure out how it works.
What is the VCC pin supposed to do? How does it supply current to the gate pin of the transistor?
https://www.digikey.com/en/...
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Making a low-cost in situ fluorometer with Arduino
I am making a low cost in situ fluorometer with Arduino based on this paper
The paper lists all the instruments required for the device, but since some of the products were outdated/hard to find, I ...
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I'm looking for a very sensitive photodiode [closed]
I'm working with a custom board that has a simple input to detect a closed switch, and I'm hoping to use it as a light sensor. I was thinking of just attaching a simple photodiode (Like this one: ...
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High frequency photodiode laser receiver strange output
We've built this transimpedance amplifier circuit to receive 10kHz pulses from a laser. The laser is driven by a square wave signal generator and is pulsing correctly. We expected to see a square wave ...
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About Negative Gain in Bode Plot regarding the Op-amp Circuit Design and its Relationship with the Feedback Resistor
I am new to the circuit simulation and now I am using Tina to simulate a op-amp circuit for a photodetector. I have some questions regarding the bode plot.
Below is the circuit design, based on the ...
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Current/Voltage Amplification and Photosensitivty in Photodiode
I have a couple questions related to the same home project. I am brand new to circuits and have just started reading into photo diodes.
Q1: I have a home project goal to essentially get a photo diode ...
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Narrow bandwidth photodiode?
I'm working with robots that use IR sensors to avoid obstacles.
In my experiment, I'm using a tracking system that uses IR leds at 850 nm.
The problem is that the IR sensors detect the tracking system ...
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Barcode reader circuit from scratch [closed]
I'd like to assess how difficult/doable is to create a barcode reader from scratch or what alternatives there are.
The application is an automated storage and retrieval system. There are containers ...
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Photo Diode Receiver
I have designed a 5KHz Photo Diode Receiver circuit that Consists of a number of blocks. first stage of this circuit is a TIA.
I have problem with DC IR Light (Like SUN Light), when sun light shine on ...
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Modelling Biased APD In Integrator Circuit
I want to model a biased APD (Avalanche Photodiode) whose current output feeds into an integrator. For the IC I will be using, TI recommends the following configuration for an unbiased photodiode.
...
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Photodiode Modelling
I want to model an Avalanche Photodiode (APD) in LTSpice. Is the below an appropriate representation?:
simulate this circuit – Schematic created using CircuitLab
If so, why is the diode ...
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