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Questions tagged [transimpedance-amplifier]

A current to voltage amplifier, usually implemented with operational amplifiers. Use in conjunction with the "operational-amplifier" tag if your question is about a transimpedance amplifier (TIA) implemented using an op amp.

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ASIC design of a current-to-voltage converter for a high input current dynamic range (50n-10u and output is 5V) working in a very low frequency

I am trying to design a current to voltage converter to fabricate on silicon without using any premade IC with the following specs: Input current range: 50 nA to 10 uA. No/Very low bandwidth ...
Vishesh Gupta's user avatar
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ASIC design of a transimpedance amplifier for a high input current dynamic range (50n-10u and output is 5V) working in a very low frequency/DC mode [closed]

I am trying to design a transimpedance amplifier to fabricate on silicon without using any IC with the following specs: Input current range: 50 nA to 10 uA. No bandwidth requirement. I want the ...
Vishesh Gupta's user avatar
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1 answer
34 views

STM32 ADC doesn't work when connected to circuit

When I connect my STM32L432kc ADC to the circuit, it stops working. Without connection it acts perfectly (fig. 2), but when I connect it gives (fig. 3). I thought the buffer would help, but it didn't. ...
Visje999's user avatar
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1 answer
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TIA beta factor

I read in Wikipedia the circuit and operation of the transimpedance amplifier. I elaborated on this website the steps to find the transfer function. I do not understand how to calculate the feedback ...
KaleM's user avatar
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How to Ground a Photodiode and TIA combination

I have a TIA circuit as below, In simple terms the Photo diode is a APD C30955EH and Circuit is supposed to work up to 100Khz signals digitalization. The supply which is powering the circuit is a ...
kakeh's user avatar
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2 votes
1 answer
103 views

What could be the reason that one opamp oscillating but not the other?

This is ultimately related my previous question here. And I use the following circuit: When I try with this MCP opamp I get a DC output which I want since I want the average: But when I this OPA ...
cm64's user avatar
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TIA with reverse bias adapted

I have adapted my circuit of the last post TIA circuit with reverse biases photodiode, thanks for the feedback, but it still doesn't work. I have removed the voltage divider for the positive input ...
Visje999's user avatar
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3 answers
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TIA circuit with reverse biases photodiode

Currently I created a TIA circuit with a reversed biased photodiode. I should be able to get a 30-300kHz signal, which is why the reverse biased photodiode. Reverse biasing the photodiode will namely ...
Visje999's user avatar
-1 votes
1 answer
30 views

Sensitive Transimpedance Amplifier frequency bandwidth [closed]

I've built the transimpedance amplifier based on this project Sensitive Transimpedance Amplifier Oscillates. I've used op amp LMC6001, symmetrically power 5 volts, feedback resistor Rf = 100MΩ, ...
Paweł Chmolewski's user avatar
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STM32L432KC used for negative voltage?

My TIA circuit's opamp needs a negative supply in order to get a output with a 2V dc bias and ac signal that the stm adc can sample. This is needed since the opamp needs a ~3V difference between input ...
Visje999's user avatar
3 votes
3 answers
321 views

What does Gain mean when LTSpice plots Gain vs Frequency in AC analysis?

I am trying to simulate the frequency response of a trans-impedance amplifier in LTspice, with a current source input, as shown below: My question is when doing ac analysis, the gain that LTspice ...
Koustubh Jain's user avatar
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2 answers
84 views

How to modify this TIA amplifier in this scenario?

I want to use a photodiode in photovoltaic mode with a TIA amplifier and be able to set the gain with a feedback resistor and also minimize the dark current offset related and with certain linearity. ...
cm64's user avatar
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1 answer
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TIA needs negative voltage supply

My TIA (figure 1) needs due to its op amp at least a negative voltage supply. There is needed a 3V difference (datasheet op amp). But how can I create this negative supply, I have a 12V dc power ...
Visje999's user avatar
0 votes
1 answer
27 views

How to get TIA DC BIAS lower

I am currently working on a TIA circuit. Against most TIA circuits, I used a reverse voltage over the photodiode, which is needed to lower its capacitance (eventually given a higher signal bandwidth ...
Visje999's user avatar
1 vote
1 answer
52 views

What opamp parameters play role for this TIA scenario?

Since I'm not very much aware of opamp internals. I might have a bit difficulty with expressing my question good enough but I will try with an example. This is mostly about opamp's response to sudden ...
user4444's user avatar
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1 answer
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Why is the actual circuit bandwidth so low for this TIA?

So, I roughly implemented the TIA, I found in this paper using a transistor array CD-4007's PMOS-es and a single discrete 2N7000 NMOS transistor. I also use a 1 Mega Ohm resistor to measure my output ...
Koustubh Jain's user avatar
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Transimpedance Amplifier Gain ac and S-parameter Analysis

I'm currently working on finding the transimpedance gain of a transimpedance amplifier. However, I've encountered an issue where I get different gains when performing AC analysis compared to S-...
Masood Salik's user avatar
2 votes
1 answer
49 views

What does this NMOS/PMOS connected to Vout do in this TIA (Trans-impedance amplifier)?

I was trying to understand a TIA (Trans-impedance Amplifier) design by Behzad Razavi which I found here. But I don't get what the transistor marked below, which is connected to the Vout, does? I even ...
Koustubh Jain's user avatar
1 vote
1 answer
74 views

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 ...
LifeIsBeatiful's user avatar
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1 answer
47 views

Current-to-voltage converter not reaching expected Output

I have this circuit: (Current-to-voltage converter, second circuit on this page) The OpAmp is lm358A (datasheet) The Supply voltage of the OpAmp is +18V and -12V For Rf is used 500 Ohm Iin = 20mA Vout ...
AloneInTokyo's user avatar
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1 answer
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Transimpedance amplifier with OPA838 - oscillation - supply voltage

This post is the continuation of my previous post: Transimpedance amplifier with OPA838 - instability Considering there were a lot of discussion, so we made this new post, to add for details, such as ...
Andromeda's user avatar
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1 answer
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Op-amp with significant noise

I have the circuit below on breadboard. (Photodiode connected to op-amp in Transimpedance configuration) With LF351N (placed on the breadboard) as op-amp I'm getting nice signal on oscilloscope ...
LifeIsBeatiful's user avatar
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0 answers
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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 ...
Harry Furey-Soper's user avatar
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1 answer
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OpAmp Input Impedance vs Load resistance

I have below photodiode that provide low rise time based on 50 ohm load resistor. However I'm planning to use it with opamp in transimpedance configuration. In this configuration, current is running ...
LifeIsBeatiful's user avatar
5 votes
1 answer
129 views

How does this Precision, High-Speed Transimpedance Amplifier work?

I am confused by the equivalent circuit of the OPA380, a precision Transimpedance Amplifier from Texas Instruments. The internals of the amplifier are pictured below: I assume the integrator and the ...
Virgil_Tibbs's user avatar
2 votes
0 answers
148 views

Simulation of transimpedance amplifier in LTspice

I am trying to simulate a circuit that is presented in a research paper by Dr Behzad Razavi. I am using LTspice for the simulation (please see the attached image and netlist for the circuit). I am ...
Masood Salik's user avatar
0 votes
2 answers
92 views

Transimpedance amplifier with parallel RC

Consider this circuit. Since a constant current source is present, the output voltage will always be $$V_o=i_sR_f$$ However, you can also drive $$i_s=i_c+i_R=C\frac{dv_c}{dt}+v_c/R$$ Then you can say ...
student1's user avatar
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1 answer
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Transimpedance amplifier: weird simulation results

I am working on a photodiode transimpedance amplifier based on an OPA2374 and decided to simulate it in TINA TI. However, several unexpected issues arose. AOL and GBW product vary significantly with ...
Virgil_Tibbs's user avatar
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0 answers
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Focusing on specific input range of transimpedance amplifier

I am trying to make a spectrometer to measure TSS (total suspended solids) in water to that end I'm using a photodiode going into a standard transimpedance amplifier which works as expected if i block ...
Andreas k-rasmussen's user avatar
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1 answer
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High pass filter after TIA is not behaving as expected in LTspice

I have the following schematics to amplify a current signal modulated at 10 kHz. The first stage is a transimpedance amplifier with a -3dB bandwidth of 72 kHz. The second stage is a high pass filter ...
oscar garcia's user avatar
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1 answer
135 views

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 ...
LifeIsBeatiful's user avatar
1 vote
1 answer
73 views

TIA: Is OP-AMP necessary when low speed and high current gain?

I've read here. Regarding this picture: If there conditions are satisfy: Gain resistor is very high e.g. 10Meg rather than 10k Low speed close to DC Connect this circuit output to ADC input, and ...
curlywei's user avatar
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1 vote
1 answer
168 views

Why is the opamp's inverting input not at virtual ground?

I've have been trying to make a current to voltage converter using a transimpedance amplifier circuit. I have been simulating the circuit in LTspice and everything seems fine, but when I built the ...
Rasmus Madsen's user avatar
2 votes
3 answers
773 views

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&...
mapplejacks's user avatar
0 votes
2 answers
105 views

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 ...
kakeh's user avatar
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0 votes
2 answers
51 views

What is Cbp and Ctant in this diagram?

I'm using an analog devices tool to simulate a transimpedance amplifier. When I finish my circuit design, it generates some Cbp and Ctant bypass capacitors which I have never seen before. I assume ...
Winston Wilhere's user avatar
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1 answer
77 views

Right transimpedence amplifier choice for input range

I have a device that produces a ±30 nA signal and I'd like to measure this to a 0.1 nA precision. Since the currents are so low and I don't have much time to make mistakes, I am planning to use a TIA ...
JoVi's user avatar
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2 votes
1 answer
107 views

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 ...
OnHai's user avatar
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1 answer
84 views

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 ...
Teena's user avatar
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0 answers
80 views

How to Place the AC-coupling capacitance and resistance in a TIA circuit

I am planning to use OPA858 as the Transimpedance Amplifier for the following TIA circuit. C2, R8 are to AC couple the circuit: In the data sheet of OPA858, it recommends using this layout with Riso ...
Wu Eric's user avatar
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1 vote
3 answers
99 views

Transimpedance Amplifier Output Range with SiPM

I'm designing a transimpedance amplifier for a SiPM (Silicon Photo Multiplier Array Broadcom AFBR-S4N44C013) sensor. I want the output voltage to range between 0 and 3.2 V max so I can input it into ...
truncatingtelescopes's user avatar
0 votes
1 answer
108 views

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 ...
Wu Eric's user avatar
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3 votes
1 answer
275 views

Virtual ground not close to ground in a current to voltage converter

I was hoping to get some feedback on a circuit I'm building. The schematic is as follows: Some description: This circuit essentially functions as a constant AC voltage source with current booster ...
summeriok's user avatar
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0 answers
60 views

What is the right way to avoid crosstalk of different analog channels?

I'm designning a board including three channels of light pulse detection, each channel contains TIA and FDA: During test, I found large pulse on one channel will cause some crosstalk on other two ...
FNJU's user avatar
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2 votes
0 answers
81 views

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 ...
FNJU's user avatar
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0 votes
0 answers
163 views

SiPM transimpedance amplifier design

I'm designing a transimpedance amplifier for a SiPM (Silicon Photo Multiplier Array Broadcom AFBR-S4N44C013) sensor. Basically I want the output to be 3.2 V max. so I can input it into an Arduino, ...
Charlieglider's user avatar
3 votes
1 answer
232 views

Ways to get around amplification limited by op amp GBW?

I'm working on a project that requires me to amplify 70 pA to read out at 10 V (the digitizer I'm using to collect data has a range of 0 to 10 V readout). On top of this, I need to sample my voltage ...
Winston Wilhere's user avatar
0 votes
0 answers
456 views

Schematics of photodiode BPW34 interfacing with an ADC ESP32

I am designing a circuit that uses a BPW34 photodiode for visible light communication. The transmission distance is about 5-6 m, and the transmission frequency is only about 1-10 kHz. I have consulted ...
Shu's user avatar
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0 votes
1 answer
162 views

LTSpice multiple input source noise analysis

In my schematic, I have two input differential current source and I want to simulate the output noise of the system. However, the LTSpice noise simulation only allows me to put one input source in the ...
livecf's user avatar
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0 votes
1 answer
87 views

Visible light communication using photodiode receiver [closed]

I am designing a receiver circuit using photodiode with visible light communication application, analog signal I read with ADC of esp8266. The circuit below is my design with a TIA and amplifier. Is ...
Shu's user avatar
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