need help to amplify microvolt AC.

Hi. I am student doing some research work , I am stuck in something. I want to convert microvolt AC that i get from some sensor , i want to amplify it upto 5V DC so i can make relation with input and gain.

i tried many circuit and modules but microvolt is very less for them to work. so i need help if anyone give any suggestion.

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dougw over 4 years ago +2

What frequency is the signal? You will need a very low noise amplifier, probably more than one stage.
michaelkellett over 4 years ago +2

More information is needed. What kind of sensor, what frequency range of signals ? shabaz posted what might be a helpful article: Building a Measurement Amplifier MK
gordonmx over 4 years ago +2

I would be more interested in what issue(s) Ahmed has seen. If it is electrical noise pickup the input impedance may be too high or he may have to put a metal can around the circuit. If noise is being…

shabaz over 4 years ago

Hi Ahmed,

This need more info, what is the sensor (link to it's datasheet perhaps).
The next question (kind of obvious, but since I don't know the answer so I'm going to ask), have you asked the sensor manufacturer?
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dougw over 4 years ago

What frequency is the signal?
You will need a very low noise amplifier, probably more than one stage.
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michaelkellett over 4 years ago

More information is needed.

What kind of sensor, what frequency range of signals ?

shabaz posted what might be a helpful article:

Building a Measurement Amplifier

MK
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michaelkellett over 4 years ago in reply to michaelkellett

Wow, shabaz and dougw were in there fast.

MK
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shabaz over 4 years ago in reply to michaelkellett

Are we all on a tea break : ) I am.
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salman34 over 4 years ago in reply to shabaz

actually its simple sine wave of 100 micro volts.
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salman34 over 4 years ago in reply to dougw

any suggestion of ac micro volt amplification ic.?
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michaelkellett over 4 years ago in reply to shabaz

shabaz

I am now - just got a new board with tiny Gowin FPGA powered up and working.
Coffee has definitely been earned.

MK
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michaelkellett over 4 years ago in reply to salman34

@ salman34

You really do need to give us more information to get help.
So, the waveform is a sine wave, is 100uV RMS, pk=pk, pk or what ?
What is the frequency range ?
What signal to noise ratio do you need ?

Why not tell us what sensor you are using, it will make it much easier to help you.

MK
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dougw over 4 years ago in reply to salman34

OP27 is about the lowest noise op-amp I have used.
I have used them to amplify 1 microvolt signals.
You need to be very careful with all aspects of your design to keep noise in the signal below 1 microvolt. Especially the power supply.
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