I need to amplify a weak signal(few nanovlts) from solenoid to few hundred millivolts. I am working on an energy harvesting device but I am unsure of the output since the DAQ(HP 34970 A) works in range of millivolts. So is there any amplifier which I can use for this purpose? I had read a few suggestions about using op amp 741 and op amp LT1028.
closed as unclear what you're asking by Marcus Müller, Olin Lathrop, Transistor, Voltage Spike, uint128_t Apr 5 '18 at 23:35
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I need to amplify a weak signal(few nanovlts) from solenoid to few hundred millivolts.
You are chasing at shadows. There is probably no signal there at all.
Nanovolts (10-9 V) are ridiculously small units. There are numerous sources of experimental error which can produce voltages in even the µV range, including:
- Thermal noise.
- Current induced in your test leads by nearby devices (e.g, a cell phone, a computer, fluorescent lighting, or the measuring instrument itself).
- Electrochemical potentials created by differences in metal composition between your test leads and probes, the jacks in the measuring instrument, and/or the devices they are probing.
No amount of energy harvesting can turn a nanovolt potential into useful energy. An amplifier is certainly not helpful, as it requires an electrical input to perform amplification.