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Questions tagged [transimpedence]

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3
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1answer
36 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
votes
1answer
31 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 ...
1
vote
0answers
40 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
vote
2answers
37 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
votes
2answers
45 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
votes
2answers
82 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 ...
0
votes
2answers
51 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
vote
2answers
46 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 ...
-1
votes
1answer
30 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 ...
0
votes
1answer
61 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
votes
1answer
145 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
0answers
136 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
264 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
80 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
votes
2answers
239 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 ...
0
votes
0answers
83 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
votes
2answers
122 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
votes
1answer
132 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
votes
2answers
134 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 ...
0
votes
3answers
81 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
votes
1answer
182 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
vote
2answers
163 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
votes
1answer
349 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
votes
1answer
70 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
1answer
132 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
114 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
436 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
199 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
votes
1answer
312 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
votes
0answers
226 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
votes
2answers
700 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
vote
1answer
136 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
vote
2answers
448 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
votes
1answer
344 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
votes
2answers
305 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
vote
2answers
182 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
votes
3answers
437 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 ...
-1
votes
2answers
60 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
votes
1answer
286 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 ...
-2
votes
1answer
379 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
votes
2answers
428 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
votes
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)?!...
1
vote
3answers
548 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
votes
3answers
138 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
votes
2answers
108 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
votes
2answers
194 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 ...
0
votes
1answer
144 views

Simple TIA PCB Problems

I am embarrassed to say I have been wrestling with this problem for some time, and am near to giving up. My TIA PCB always outputs high. The bread board version works well enough, albeit with slightly ...
1
vote
0answers
257 views

Controlling digital potentiometer as feedback resistor in transimpedance amplifier

Main Idea: I have designed a transimpedance amplifier for current-to-voltage conversion application. To increase the dynamic range of the input current that can be measured, I have integrated the ...
0
votes
1answer
121 views

selective photodiode transimpedance amplifier

i would like measure a tiny bit off reflected light from a modulated led in an ambient light environment. I'm afraid the large ambient light output wil saturate my amplifier with the high ...