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Questions tagged [transimpedence]

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1answer
20 views

Measuring integrated current

I want to measure the amount of light striking a photodiode in a specific time window (about 1ms). In this window, we get \$10^6-10^7\$ photons, which get converted into electrons with about 80% ...
4
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1answer
59 views

Large dynamic range current sense 1uA - 100mA

I am looking at large dynamic circuits and came across an interesting project by ETH Zurich called the rocket logger - https://rocketlogger.ethz.ch/ I am a little confused by their current sensing ...
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0answers
47 views

Origin of increased noise in BF862/OP27 charge amplifier

For the amplification of piezoelectric sensor signals I am currently building a charge amplifier with a low noise JFET frontend utilizing an NXP BF862. The amplifier design is based on application ...
3
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1answer
40 views

Phase shift near saturation mitigation in input stage amplifier — How does this work, why does this work?

I'm trying to understand how this circuit works on the input stage to the 4192A Impedance Analyzer. Apologies for the quality... this is the best scan I could find. The design is furnished with the ...
0
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1answer
39 views

where do i find max short circuit current of photodiode?

I'm trying to convert the current signal from a photodiode to voltage through a transimpedence amplifier. The photodiode is put in photovoltaic mode in order to get the greatest accuracy and lowest ...
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0answers
46 views

Electronics interface circuit for PIN Photodiode

I am designing an interfacing circuit for PIN photodiode which will be used in NIR spectrophotometer project. The PIN diode is <...
1
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2answers
45 views

Photodiode in photoconductive vs photovolatic configuration

I want to use a photodiode to measure light intensity, but I am not sure if the photodiode should be used in photoconductive or photovoltaic mode. From my understanding the photovoltaic ...
0
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2answers
57 views

SPICE circuit to find AOL and noise gain of Transimpedance amplifier

In Chapter 10 of Art Kay's book "Operational Amplifier Noise", he gives a SPICE circuit (pp.179) that can be used to generate the noise gain, AOL, and current-to-voltage gain. Could anyone explain to ...
2
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2answers
89 views

Current feedback amplifier input structure

This is an input stage of some obsolete CFA (current feedback amplifier): Current feedback amplifier is a transimpedance amplifier, which converts current signal at its input into voltage signal at ...
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2answers
53 views

Measuring current vs voltage

Let's say that I have a periodic charge build-up across the capacitor C1. I could either choose to measure the current using a transimpedance amplifier as shown below or could measure the voltage ...
1
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2answers
52 views

Photo multiplier tube and lock in amplifier

My photomultiplier tube is connected to a Transimpedance amplifier for routine experiments. However for an experiment I need to connect the output of the PMT to lock in amplifier (SR 865A). The manual ...
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1answer
42 views

multiplex multiple photodiodes to one transimpedance amp

TIA = transimpedence I have lots of photodiodes for barrier detection, I tested one photodiode with one TIA op amp, and it was OK 1) Now I want to multiplex multiple photodiodes for my project, and ...
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1answer
64 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 ...
0
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1answer
175 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
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0answers
173 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
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2answers
328 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
94 views

Transimpedance Amplifiers on PCB

I have several transimpedance amplifiers on my board, and I want to avoid the need for a negative power supply, but I can't see any way around it (except for running the current through a resistor but ...
6
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2answers
311 views

Reducing Transimpedance Amplifier Noise

I'm investigating a noisy output of a Femto DHPCA-100 high speed transimpedance amplifier (http://www.femto.de/en/products/current-amplifiers/variable-gain-up-to-200-mhz-dhpca.html). The final ...
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0answers
92 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 ...
0
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2answers
144 views

Transimpedance Amplifier (TIA) - How to shunt high current spikes?

I am working on the design of a high-bandwidth transimpedance amplifier (TIA) to detect a relatively weak optical signal (100μW) but also be able to withstand short pulse, high power optical signals (>...
0
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1answer
161 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) ...
3
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2answers
144 views

Double Peak Phenomenon in Transimpedance Amplifier Simulation

I'm simulating a transimpedance amplifier circuit in order to replicate a phenomenon that my team is experiencing. The phenomenon can be seen below in the image circled in red: My photomultiplier ...
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3answers
82 views

Strange Waveform at high frequency from transimpedence amplifier

Using a simple transimpedence amplifier setup, I was able to measure noise from the output waveform by applying a small signal to the non-inverting terminal, while the inverting terminal receives dark ...
2
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1answer
206 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 ...
1
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2answers
211 views

Transimpedance amplifier bandwidth limit [closed]

What limits the bandwidth you can achieve on a transimpedance amplifier? Why can you not take measurements at say the GHz range? I'm guessing it has something to do with an RC element in the circuit. ...
0
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1answer
418 views

Causes for Saturation in Transimpedance Amplifier Circuit

I have a transimpedance amplifier circuit with a Silicon Photomultiplier as shown below: simulate this circuit – Schematic created using CircuitLab We're using the SensL MicroFJ-60035 Silicon ...
0
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1answer
72 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
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1answer
150 views

Importance of laser numerical aperture in selecting photo diode

I want to design a circuit in which the laser light will be detected by a photodiode. I just wanted to know how the laser numerical aperture will affect the photodiode selection. Am I have to ...
1
vote
1answer
128 views

Transimpedance amplifier circuit for water conductivity

I'm trying to understand the application of the water electrical conductivity measurement circuits based on transimpedance amplifier. Here the picture of general TIA configuration And here what I'm ...
2
votes
5answers
462 views

Timing Improvements to Silicon Photomultiplier Transimpedance Amplifier Circuit

I'm designing another Silicon Photomultiplier circuit. Right now, it is in the theoretical stage. My team and I have made numerous circuits, and the basic template is below: simulate this circuit &...
2
votes
1answer
229 views

Trans-impedance Amplifer with a Fully-Differential Amplifier

I'm designing a trans-impedance amplifier (TIA) for a fairly fast Avalanche Photodiode (APD), to amplify pulses of 1mA that last few nanosecond. I found a solution that have just enough bandwidth with ...
0
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1answer
365 views

Designing a senvitive frequency to voltage converter

I need to make a battery powered frequency to voltage converter that will monitor very minor frequency changes, around 100Hz with base frequency of 3-5MHz (may vary during operation); something like a ...
0
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0answers
243 views

PCB Layout for Transimpedance Amplifier

This is kind of a follow-up to this question: Current to Voltage Feedback Capacitance for SiPM I'm working on another trans-impedance amplifier circuit. The basic schematic is shown below: simulate ...
0
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2answers
772 views

Gain and Rise Time with Transimpedance Amplifier Circuit

I'm working with a transimpedance amplifier circuit using a Silicon Photomultiplier. The reference circuit is shown below: simulate this circuit – Schematic created using CircuitLab This ...
1
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1answer
149 views

Photodiode max. Output power?

I am designing a transimpedance amplifer to run at 10mA in 100uS to detect proximity of an object (low power application) I am intending to use the VSMB1940ITX01 IR LED and the VEMD6110X01 IR ...
1
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2answers
485 views

Stability of saturated amplifier and overdrive recovery

I have two questions. First paragraph is background, second is questions. Background: I have a photodiode amplifier (low capacitance APD + fast transimpedance amplifier) that has a nice response ...
4
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1answer
362 views

Transimpedance amplifier with decompensated op amp

I am trying to tune a wideband transimpedance amplifier for maximum speed. I am experimenting with the OPA846 and OPA847 op amps which have large GBW but they are not unity gain stable with minimum ...
3
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2answers
318 views

Which circuit is better? (Op Amp Question)

These circuits are for sub pA current detection. Each circuit has the same gain, however; shouldn't the multistage amplifier be theoretically be faster than the single stage gain? TINA TI simulations ...
1
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2answers
193 views

I/V converter + analog switch

I am trying to switch the ranges of an I/V amplifier, such that I can measure from 100nA to ~1mA of current up to 100kHz (similar to this question). I make the switching using an TS5A3357 analog ...
3
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3answers
486 views

eliminating those unwanted op amp[TIA] outputs

my problem statement: i wanted to digitalize 10ns pulses from a photodiode which are in the range of current 100uA to 1mA (these were earlier much larger in range, dealt here, soon I have ...
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2answers
61 views

Finding Total Impedence

So I know how to solve parallel circuits but I am struggling when they are not in the form of resistors rather capacitance. So I believe the form for this circuit would be: Zt= 100+ ((200||1.33j)||(....
0
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1answer
314 views

Bandwidth analysis for photodiode TIA using matlab

The schematic below show a photodiode TIA circuit, and i tested by using an led as a light source, and by connecting the PCB to the osscilloscope using the bnc connector to see the response of the ...
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1answer
425 views

Photo diode TIA

here i have designed a TIA circuit with the suitable values for the feedback resistance and feedback capacitance and using the FDS100, to achieve a bandwidth around 43 MHz, the simulation is running ...
0
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2answers
465 views

Design a Photodiode TIA for a certain bandwidth?

I am working on my master thesis these days, and I am having a serious problem. I am using FDS100 photodiode with LT6268-10 Amp to design a circuit. The required bandwidth for me is 10MHz, and I am ...
8
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4answers
1k views

Low noise transimpedance amplifier (TIA) - why does the addition of a feedback capacitor cause voltage noise peaking?

I am working on a low noise transimpedance amplifier (TIA) for the detection of weak optical signals. The aim is to achieve a 10MHz bandwidth with a white voltage noise floor of 10-20nV/rtHz. I am ...
0
votes
1answer
59 views

Transimpedance amplifier with biopotentials

I have a PPG sensor to be specific the sensor is called " easy pulse finger sensor " which is a ( phototransisitor), can it be connected to a transimpedance amplifier ( current to voltage converter)?!...
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3answers
589 views

APD Transimpedance amplifier stability [closed]

I have a photodiode amplifier that responds to a pulse of light like this: or like this: depending on how I change the feedback capacitor. Every transimpedance stability article I have read online ...
3
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3answers
141 views

Design dilemma: Are frequency counting methods better than voltage sensing when detecting ppm signals

I'm trying to design a precision spectrophotometer that only uses three wavelengths of light. The high level design involves using three laser diodes that pump photons of the three wavelengths. This ...
0
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2answers
114 views

Photovoltaic amp

I am trying to make a transimpedance amp and it's not working right. The signal going in has 167 Hz and also it's 20 uA. It is acting as a low pass filter and according to the equation I use, the ...
0
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2answers
220 views

No output voltage at transimpedance amplifier with TL081

I am trying to build a transimpedance amplifier which has a input of 20uA, square wave with a frequency of 167 Hz. My diagram looks like below but I couldn't see any output voltage. simulate this ...