Questions tagged [photodiode]
A photodiode converts light to an electric current.
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Transimpedance amplifier oscillating at high gain setting on PCB only
I am trying to make a bare minimum transimpedance amplifier for a very large Si photodiode (Thorlabs FDS1010). My circuit is just like in the picture except my digipot is an AD5272-100kohm and my ...
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Modulation Bandwidth of LED
Following on my previous post I have photodiode connected to OpAmp in inverting transimpedance configuration. (Circuit diagram can be found in previous post).
Excitation source is 4000K LED with ...
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How to determine band-pass frequency and bandwidth in photodiode TIA circuit
I'm trying to figure out how a photodiode amplifier circuit works. It is used in my university plasma physics lab to measure plasma density through laser interferometry.
This circuit was designed 20 ...
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Why does it seem like the ideal photodiode model leads to a violation of conservation of energy?
Short version of my question:
Roughly speaking, the output power from a properly biased ideal photodiode feeding a resistor is quadratic with the optical input power, with seemingly no limit. So at ...
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High-gain transimpedance amplifier with photodiode not functioning as expected
I am designing a trans-impedance amplifier using a TEMD7000X01 photodiode and an AD8551ARZ op-amp. RF is 100 kΩ, CF is 150 pF, and VCC is +3.3 V. The output of the op-amp is connected to an ADC pin of ...
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Amplifying microvolt difference between 2 constant analog signals (0-1V)
I have 2 UV light sensors for detecting ozone gas with the circuitry uploaded in the picture. I don't fully understand how it works, but the signal output is the current going through the photodiode ...
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Choose a photodiode with sensitivity matching a computer screen
I am showing a rectangle on a computer screen that needs to activate a digital (0/1) photodiode/photo detector that should only be activated when the white rectangle is shown on the screen.
I have ...
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Is 3004M1C a photodiode or a phototransistor?
The datasheet describes the 3004M1C as a "high speed and high sensitive PIN
photodiode". Distributors also label it as a photodiode. However, the datasheet mentions "Collector-Emitter ...
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Photodiode in forward circuit
I have a BPV10 photodiode. It works fine in reverse bias and conducting mode. For curiosity, I wanted to check its behavior in forward bias, so I calculated the series resistor for having a current of ...
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Can TSOP1130 work also at 850mn?
In the sheet, they test it with a 940nm IR LED. There are no clear specifications for the wavelength (range) it works with.
But I have 850nm LEDs (powerful ones).
Will it work the same, or will it ...
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VBPW34S vs BPW34S-Z key differences?
I have a circuit for detecting frequencies in light noise. Its a reverse bias mode circuit where the photodiode is coupled to a trans-impedance amplifyer circuit via a ceramic capacitor. I use it to ...
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What is meant by by output photovoltage in this context?
Regarding the photodiode bias circuit below:
There is this statement about saturation:
Photodiodes saturate when the output photovoltage approaches the
reverse bias voltage. Since photodiodes output ...
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How to use small photocell to trigger wake up pin for extremely low power consumption
I want to trigger microcontroller wake up event using a photocell that produces voltage when light.
I have BPW46 photocell and ATTiny85 in deep sleep, interrupt is configured to be trigered by PB3 pin ...
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How to estimate the optical power given the scope reading for this scenario
Regarding my previous question, I made a test with this photodiode with an attenuated(attenuation is unknown) 1550nm pulsed laser where it has 1ns pulse width and 1kHz rep rate. The circuit I used is ...
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Long distance light detection in daylight [closed]
I am attempting to develop a system that is linked with streetlight lamps. There are challenges that I can think of:
Light sensing in daylight (or climate changing) situations.
Long distance (20-30m) ...
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Can infrared light pass through solid materials?
I have an IR sensor at about few tens of mm (millimeter) from a heating source (incandescent bulb or heating element.) The phototransistor in my sensor is lead lined but I guess it is sensitive to a ...
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Why do I get unstable measurements from a Fronius insolation sensor?
I am using a Fronius insolation sensor to measure solar irradiation in a power facility. I keep track of the sensor's measurements through out the day and use them to display diagrams like this:
The ...
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Laser diode control without PD
I'm currently looking for a new light source for a system. The laser diode seems to be an excellent candidate. However, for the specific wavelength I need (488 nm), diodes with an integrated ...
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Opamp GBW is not matching with measurement
I have circuit below on breadboard with LF351N op-amp in transimpedance mode with feedback resistor of 10 kohm and 10 pF capacitor attached in parallel.
In datasheet of LF351N (Datasheet) it is ...
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Noise in high frequency photodiode op-amplifier
I am trying to use an op amplifier for my photodiode using this scheme:
The expected amplification is 5, ut instead I am getting a nearly constant output independent of light on photodiode.
I tried ...
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LED "optical noise" when powered by DC
I am currently designing a circuit where:
An LED driven by a constant current driver shines directly into a photodiode. (I have also tried without the op amp constant current circuit.)
The photodiode ...
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Replace photo diode and phototransistor with an IrDA chip
We have a circuit that communicate optically with a symmetrical circuit (exactly the same circuit at the other side). The circuit is based on a phototransistor SFH 320, a photodiode ZTHI55WA-3-SGM, ...
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Short circuit of voltage regulator
I am trying to design a circuit to get an amplified signal out of an OPT101 photodiode.
The photodiode contains an amplifier (and there is an additional opamp for further signal amplification on the ...
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Optical switch LED-Photodiode
I was designing an optical switch based on a LED photodiode couple to detect the presence of an object between them. What i know is, for the LED:
Power dissipation [mW]
Forward current [mA] and ...
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How does a CMOS image sensor manage to read and record all the pixel values? Any good ideas for doing it for discrete components?
As background info, I'm an electrical engineer (power IC design) and photographer, and I'm designing my own camera (32x40 discrete pixels made of SMD photodiodes, will be about the size of a 4"x5&...
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Advice on Designing a Low-Current Photodiode to Digital Pulse Circuit
I'm currently working on a project that involves converting very low photo diode current pulses, typically around 100nA, into digital pulses. The pulse-repetition frequency (PRF) is about 10 kHz, with ...
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What are the PCB design guidelines to achieve a noise floor of 0.1 mV? What are the significant measures to reduce the noise floor to 10 micro-V?
I am designing a photodiode (PD) readout circuit containing the PD, I-V op-amp, the amplifier's 2.5 V regulated supply, and associated resistors & capacitors. The op-amp's output will be connected ...
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How can I sense Infrared Light properly to detect direction of Motion
I've designed the schematic below:
Basically, I want to detect direction of motion at a door frame from the top to turn on or off a relay which is probably connected to lights. The phototransistors ...
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Photodiode op amp circuit, incorrect or correct output?
I am using the S12053-02 APD and the ADA4817 op amp. I'm not really sure if I'm getting the correct output or if the configuration I have is the best. I am trying to get a near 1 to 10 nA to mV, so if ...
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HV to ADC interface for Photodiode pulses
Reduced circuit for simplicty. LHS circuit models SPAD pulses in response to photon pulses.
My issue is that I need to acquire cathode output from HV and to condition it to ADC, say FSR=5V. I'm ...
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What limits amplification of transimpedance amplifier?
I'm designing a transimpedance amplifier but I'm having trouble getting higher gain. I started with Rf being 16.5 kOhms but then I realized I will need higher gain, so I simply switched it out for 50 ...
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How to properly model biased photodiode circuit with cross-talk
The overall goal is the following: I need a board with two photodiodes, each with a bias tee (cutoff around 70 MHz) connected to it, for a total of 4 outputs. The photodiodes will see short pulses, ...
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Do you have any suggestions for revisions of this schematic?
I have this schematic:
Source: https://drive.google.com/file/d/1CbRIJQbl0sYk1aCY0UPvfPe7hDIebd2M/view?usp=sharing
I use it for a DIY colorimeter using to tricolor RGB LED with a common cathode. I'm ...
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Trans Impedance Amplifier with a photodiode
I made a Trans Impedance Amplifier circuit using a OPA322 op amp with a photodiode (Hamamatsu－S2386). I use a MCP3421 to convert the analogy signal to I2C digital signal after, and use a MCU to read ...
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Photodiode and Transimpedance amplifier
I am building a transimpedance amplifier that is connected to a photodiode. (I want to measure the light from a laser).
I build one using the opamp LM324N. But it is not working as a TIA amplifier. I ...
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Phototransistor receiver circuit output display 0 V
I am working on a sensor for my university project. The output displays 0 V, but when I put the light in, the value changes. When I put it in the box, it displays 0 V again. I am working with an ...
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Does anyone know what this photodiode circuit is for?
I'm looking at some circuits for some sensitive photodiodes and I'm a little confused about what the following is doing. For context, this is connected between the output of the first stage TI and the ...
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Suggestion about drag and amplify pulse
Following picture is Photodiode I/V pre-amp of my circuit
My target pulse from OPA356 output, which range is 15mVpp /130ns-width to ...
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Replacing pushbutton with sensor in 555 timer latch circuit
I want to make a circuit where there will be a photodiode which when receives infra red light from the IR LED for the first time, produces a high output and when it receives the light for the second ...
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Putting a RC filter after the photo-diode to AC-couple the TIA gain stage
I have been designing a photo-diode circuit which separates out DC and AC signal of the photodiode. I am using MAX4007 as the current mirror for the DC branch and I am using OPA858 as the ...
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Single Photon Detection Using an FPGA
I am an undergraduate student working on a summer project involving single photon detection and coincidence counting. The main issue with the project is that the voltage threshold preset into the ...
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APD current limit or decreasing the di/dt
I'm trying to design a TIA circuit with APD to detect the light pulse, and a large dynamic range is required.
I have several channels on one board and I found there are some crosstalk on the nearby ...
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How to test photo interrupters
I have come upon two photo interrupters in a calibration kit circuit. The circuit seems to not respond. How can I check these photo interrupters? The green LED is responding when an object is brought ...
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Calculating responsivity
My homework asks me to calculate "maximum responsivity" for a photodetector at frequency F Hz. Speed of light, Planck's constant, value of elementary charge, and Boltzmann constant are given....
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Designing an amplifier circuit for a BPW34 photodiode
I'm designing a laser seeker circuit. I need to amplify the photodiode so that the photodiode can detect laser beams reflected from the wall. I couldn't achieve this with the amplifier circuit you see ...
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Connect multiple PPG sensor to developing board
I'm pretty new to this world, so I'm sorry if my question sounds stupid.
I want to work with multiple optical sensors to record PPG simultaneously.
In particular, I want to use the MAX86916 sensor:
...
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Increase speed to 9600-19200 in optical communication circuit
The circuit in the picture is the optical communication circuit of the RX. Currently, its maximum speed of communication is 2400. I want to increase the speed to 9600-19200. I have lowered the ...
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Single PIN photodiode in comparision with dual PIN photodiode configuration of balanced detectors
A typical balanced photo detector configuration to tackle background noise is depicted below:
There are configurations which use a new terminology and configuration like below:
Which configuration ...
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Why do photodiode transimpedance amplifiers care about signal frequency?
I'm designing a circuit to amplify low light levels (in the range of 0.1 uW) of measured black body radiation for application in a pyrometer. I don't have much experience with this kind of stuff so I'...
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Transistor transimpedance amp design for photodiode digital input to arduino at 1MHz
I would like to use a photodiode with an atmega328 to detect pulses of light from a toothed disk (illuminated by IR from the far side) at around 1MHz. Its to detect mechanical jitter in the rotation ...
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