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What are the signal and power requirements for the circuit?Carl, can u help me out on this? Sample circuit, perhaps a diff opamp of 5X with bandwidth limitation?
Thanks for the advice:
I see an interesting opamp design in fig 9.3 in this link:
**broken link removed**
It seems to get around having to use matched resistors.
BTW is this bandwidth limiter as u describe...it seems to work now.
That's only true for the input current noise. It has no effect on the voltage noise, which is usually the dominant noise source for typical values of input resistor values.If the op amp is spec'd with a given input resistance then the noise could increase if the resistance is increased. For example, if it is spec'd at 100 ohms and you raise the input resistor to 1k the noise could increase by as much as 10.
Yes, the 358 should work for that.BTW what is the prob with using the 358 if the output is 1.5VDC below VCC once Vcc is much greater than the expected output voltage swing? The pdf link didn't really go into it...they just said rail to rail, I'd like to understand why. Seems to me both of those amps I mentioned meets the more detailed spec .6V>Vout>Vin (sense).