What frequency? For most op amps it may be difficult to get a gain of 1,000 at a high frequency.Hi guys,
I am currently trying to amplify 1mV analog signal to 1V.
What is the best way to do that?
Gain-BandwidthHi guys,
I am currently trying to amplify 1mV analog signal to 1V.
What is the best way to do that?
Crude and unfinished ideas, but just to give you an idea. Battery powered was assumed. Two 9 V batteries.Hi guys,
I am currently trying to amplify 1mV analog signal to 1V.
What is the best way to do that?
Bandwidth is 100Hz- 1KHz.What frequency? For most op amps it may be difficult to get a gain of 1,000 at a high frequency.
Thank you hp1729,View attachment 111057 View attachment 111056
Crude and unfinished ideas, but just to give you an idea. Battery powered was assumed. Two 9 V batteries.
Below 1 KHz only one op amp is necessary. Two op amps gets you up to 100 KHz.
Better op amps may get you better results. Definitely needed for frequencies above 100 KHz. No filtering is shown, not knowing what your frequency is.
It is STK984-090A-E.Help us out a bit more. What IC are you using?
Certainly agreeable on a better op amp (and circuit). Would a single supply op amp be better for him?Note that the bandwidth of the single 741 op amp circuit gives a -3dB rolloff at 1KHz for a gain of 1000, since the op amp has a gain-bandwidth of about 1MHz.
For less rolloff at 1kHz, you would need a higher gain-bandwidth op amp or the two op amp circuit.
What do you mean by more issues ?You probably want tot select a high side current amplifier. e.g. http://www.linear.com/product/LTC6101
or maybe http://www.linear.com/product/LTC4151 to get the values into a computer as well.
You have more issues than just amplifying 1 mV.
that is motor driver... what exactly you wish to accomplish? measure current draw using sense resistor in the IC? this resistor is on high side and you don't want AC coupling.It is STK984-090A-E.
According to specs, this IC has current sensing resistor with min 2.91 mOhm, typ 3mOhm, and max 3.09 mOhm
I know that is a BLDC driver. I wan to measure the current on the high side and there is no AC coupling.that is motor driver... what exactly you wish to accomplish? measure current draw using sense resistor in the IC? this resistor is on high side and you don't want AC coupling.
I got it now.There are OP-amp selection issues when the common mode range exceeds the power supply. Standard run of the mill OP-amps won't cut it. The second choice allows the micro to read the values with an EXTRA part.
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