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I am designing a TAI using this tool from Analog devices. The circuit diagram and it's frequency response obtained from the design tool is given below. Circuit Diagram: ** Frequency Response**...

2 answers · posted 3d ago by newbie‭ · last activity 16h ago by Designalog‭

Question Analog opamp transimpedance-amplifier

#2: Post edited by

newbie‭ · 2025-05-27T07:46:12Z (2 days ago)

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I am designing a TAI using this tool from Analog devices. The circuit diagram and it's frequency response obtained from the design tool is given below.
**Circuit Diagram:**
![Image_alt_text](https://electrical.codidact.com/uploads/nioq1gryr6yfw0ozkn6z78tcghk7)
**
Frequency Response**
![Image_alt_text](https://electrical.codidact.com/uploads/kv48efd9d039taqarombaci9q7j8)
I simulated the same circuit in LTspice the only change I made is instead of dual supply I used single supply.I did not considered photodiode capacitance here.I will be biasing the photodiode as as shown in the first image.
In my circuit I am getting a bandwidth of only 10Hz!!!. Please find my simulation results below.The simulation file is also attached here.
May I know where I went wrong.
~~![Image_alt_text](https://electrical.codidact.com/uploads/p1n9k4ssukaka75wl69eqkosy50o)~~

I am designing a TAI using this tool from Analog devices. The circuit diagram and it's frequency response obtained from the design tool is given below.
**Circuit Diagram:**
![Image_alt_text](https://electrical.codidact.com/uploads/nioq1gryr6yfw0ozkn6z78tcghk7)
**
Frequency Response**
![Image_alt_text](https://electrical.codidact.com/uploads/kv48efd9d039taqarombaci9q7j8)
I simulated the same circuit in LTspice the only change I made is instead of dual supply I used single supply.I did not considered photodiode capacitance here.I will be biasing the photodiode as as shown in the first image.
In my circuit I am getting a bandwidth of only 10Hz!!!. Please find my simulation results below.The simulation file is also attached here.
May I know where I went wrong.
![Image_alt_text](https://electrical.codidact.com/uploads/4jg1ni9umnis3pci85ro48stunmu)
![Image_alt_text](https://electrical.codidact.com/uploads/ga7ekn44xrx0zgfgrz57e7bbd06h)
When I kept16nF.The simulation is failing
![Image_alt_text](https://electrical.codidact.com/uploads/kb7rv9u7n0hw42g4is5smqd6o14v)

#1: Initial revision by

newbie‭ · 2025-05-26T13:33:24Z (3 days ago)

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TIA Frequency Response

I am designing a TAI using this tool from Analog devices. The circuit diagram and it's frequency response obtained from the design tool is given below.

**Circuit Diagram:**

![Image_alt_text](https://electrical.codidact.com/uploads/nioq1gryr6yfw0ozkn6z78tcghk7)
**
Frequency Response**

![Image_alt_text](https://electrical.codidact.com/uploads/kv48efd9d039taqarombaci9q7j8)

I simulated the same circuit in LTspice the only change I made is instead of dual supply I used single supply.I did not considered photodiode capacitance here.I will be biasing the photodiode as as shown in the first image.

In my circuit I am getting a bandwidth of only 10Hz!!!. Please find my simulation results below.The simulation file is also attached here.

May I know where I went wrong.

![Image_alt_text](https://electrical.codidact.com/uploads/p1n9k4ssukaka75wl69eqkosy50o)

Analog opamp transimpedance-amplifier

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