All Questions
Tagged with tia or transimpedance-amplifier
80 questions
1 vote
0 answers
53 views
Photodiode + TIA + Op-Amp + Comparator circuit - Needs critique, and design help
I'm a novice at schematic design, and have spent a lot of time and effort redesigning and re-redesigning a schematic for a project I am trying to accomplish. I wanted to deflect a 620nm laser off of ...
- 11
1 vote
1 answer
93 views
Why is my TIA Circuit for a Free-Space Optical Laser receiver slow? [closed]
As a project, I'm trying to make a free-space optical, laser-based digital communications system. My goal was to reach at least UART max speeds, so about 115 kbps/kHz, but at about 10 kHz I am already ...
- 149
4 votes
2 answers
452 views
Low pass filter output stuck at supply voltage
The schematic shows 2 transimpedance amplifier circuits on the first stage, for reference and sample photodiodes. The outputs are then connected to sallen-key butterworth circuits for low pass ...
- 41
2 votes
1 answer
92 views
Voltage output formula for a transimpedance amplifier with two input voltages
Assuming that I am correct in saying for a differential the voltage at \$V_{out}\$ should be Reference: https://www.electronics-tutorials.ws/opamp/opamp_5.html $$ V_{out} = V_{ref} - \frac{R_{f}}{R_{...
- 135
2 votes
2 answers
146 views
Transimpedance Amplifier Bandwidth Simulated vs Calculated
My circuit is given below. I used this equation for calculating the bandwidth of the TIA. My RF is 200 kΩ and Cd is 1.3 pF (diode) + 9 pF (opamp input capacitance). After calculation I am getting a ...
- 4,055
0 votes
0 answers
61 views
Why does Supplying Bias Voltage Through Coax Shield Degrades TIA Bandwidth and introduces noise?
I’m working on a setup where a photodiode is connected to a transimpedance amplifier (TIA) via a coaxial cable. The photodiode requires a reverse bias voltage -5 V, which is supplied from the TIA side....
- 57
2 votes
2 answers
259 views
Reducing the noise in a transimpedance amplifier circuit
I've soldered a transimpedance amplifier circuit on a strip board for use in detecting moving objects. I am using the following components for the transimpedance amplifier: an MCP6272 dual op amp (...
- 113
1 vote
1 answer
102 views
Why RF mixer is a current source?
As far as I understand a TIA (transimpedance amplifier) is often used to amplify RF mixer output. I have a board that I started to obtain predictable results from only when I started to treat the IF ...
0 votes
1 answer
84 views
TIA Output is not coming as expected
I am using OPA320 in my design. This is for a trans-impedance amplifier circuit. My circuit is given below. I am expecting an output voltage of 3-(4u*20K) = 2.9 V, but obtained a value of zero. The ...
- 4,055
0 votes
0 answers
61 views
Schematic reviews of charge amplifier for piezoelectric sensor
(I will share my kidcad project as fast as i can) I’m currently finalizing the design of a charge amplifier for piezoelectric (PZT) sensors, and I would greatly appreciate your feedback on the ...
- 21
2 votes
2 answers
253 views
OPA843 2 Stage Amplifier - Noisy Output
Continuing from my earlier post, Amplifier output noisy signal with sharp peaks as below. Circuit powered up with TENMA 72-13330 power supply. (datasheet) EDIT: After applying @user1850479 suggestion (...
- 145
0 votes
1 answer
123 views
OPA843 2 Stage TIA Constant DC offset and No Response to Modulation
I'm building on my previous question here. My TIA circuit is now fully based on SMD components with OPA843 and a 2 stage amplification. I have tried to follow suggestions in previous question as well ...
- 145
2 votes
1 answer
229 views
3dB Bandwidth reduction in TIA circuit
I have below PCB of Transimpedance amplifier circuit which amplifies the photodiode current in inverting configuration. I initially started with OPA357 (datasheet) and I'm able to achieve ~11.4MHz 3dB ...
- 145
2 votes
2 answers
112 views
Remote low-level photodiode amplifier: preferred architecture
In working on a spectrophotometer design, I have to make a design decision for implementing the photodiode front-end amplifier and ADC. One of the requirements I have set is a dynamic range for the ...
3 votes
2 answers
345 views
Help with simple transimpedance amplifier circuit
My goal is to read luminance signals with a certain level of sensitivity (able to tell when an OLED screen is on or off) with at least a 1 kHz sampling rate. I am following this tutorial (https://...
- 31