Timeline for Achieved SNR is different than the simulation results
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| Jun 25 at 11:30 | comment | added | Andromeda | @RussellH thank you for your comment, the PCB does matches the schematic, the decoupling capacitors are on on the bottom layer. regarding J2P1 is ok, it the power rail of the amplifier. | |
| S Jun 25 at 1:12 | history | edited | Greenonline | CC BY-SA 4.0 |
Added image descriptions and hover tags. Removed regards.
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| S Jun 25 at 1:12 | history | suggested | MarianD | CC BY-SA 4.0 |
Some fixes.
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| Jun 24 at 22:47 | review | Suggested edits | |||
| S Jun 25 at 1:12 | |||||
| Jun 24 at 22:27 | comment | added | user319836 | 1) The PCB designations do not match with the circuit diagram. 2) The circuit diagram does not show R1 in series with the input. 3) There are no decoupling capacitors close to the power pins of the chip. 4) There is a PCB layout error on J2P1@Andromeda | |
| Jun 24 at 21:56 | comment | added | Justme | @Andromeda The transducer may pick up noie but even in pure rest state it is a noisy source, the tranmission line to amplifier is noisy, the amplifier itself is noisy, and even the feedback resistor generates thermal noise. Now depending on where the noise is generated, it gets added and/or amplified to the signal. | |
| Jun 24 at 21:49 | comment | added | Andromeda | @Justme thank you for the comment, the sensor is an ultrasound transducer, which is can produce a very tiny output current in rang of 100-200uA, I assume this is the SNR of the transimpedance amplifier. | |
| Jun 24 at 21:36 | comment | added | Justme | How do you know the theoretical SNR? Is it just the SNR of amplifier, SNR of the whole electrical circuit alone, or SNR of random photons hitting the sensor, or is there a signal which gets some noise gets applied before photodiode sees it? (Assuming th sensor is a photodiode. You don't say what sensor it is). | |
| Jun 24 at 21:25 | comment | added | Andromeda | @Tom Carpenter thank you for your comment, I added the PCB and the schematic details in the post. | |
| Jun 24 at 21:23 | history | edited | Andromeda | CC BY-SA 4.0 |
added 338 characters in body
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| Jun 24 at 21:18 | comment | added | Tom Carpenter | Take an FFT of your noise and see if there is something specific there. Show us details of your hardware - is it a PCB? Breadboard? What filtering and decoupling do you have on your board? | |
| Jun 24 at 21:07 | history | asked | Andromeda | CC BY-SA 4.0 |