Would you please help me pick out an opamp with its specific eval board. I just need the opamp to have low noise, low drift and low off-set. I will be using it to to build a second order bessel filter.
Thanks a lot.
I can recommend our tools to use in your design. You can try our Analog Filter Wizard to design your filter and our ADIsimPower to design your power supply.
If you need high performance, the ADA4528 may work. There is a universal eval board EVAL-OPAMP I believe. Price for the op amp is reasonable for smaller projects...
Thank you for your reply. I have just realized that since my signal is -5V-0V, I would probably need a V supply of (-12V)-(2V). I did not see any V supplies with negative voltage input. Would you suggest anything?
Did you mean a power supply ckt with outputs of -12v and +12v? If so, I've designed using some of the TI LM ICs (LM2587 in particular) in the past. I'm sure I can find an AD equivalent ckt if you tell me your requirements;
(a) output voltages: (+12v and -12v?)
(b) output current required (amps): (how many ckt will you drive from this power supply)
I will drive one circuit out of the power supply.
The input signal is anywhere between -5v to 0v, and I do not care about the gain of the system since I will just be using the op-amp to design an active low pass filter. So the output voltage can be variable depending on the gain of the chosen op-amp.
I imagined that if the gain is 2, then the output will be anywhere between -10v to 0v. So the v supply should provide -10 to 0 volts. But accounting for loss, then the v supply should cover a slighly larger range, such as -12v to 2v. Is this reasonable?
Hope this clarifies my requirements.
Yes, I recently came across these tools. They are great. Thanks a lot.
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