Part Number: LM7171
Tool/software: WEBENCH® Design Tools
I am looking for a TINA-TI Op-Amp (LM7171) file that I can open in TINA-TI and run the transient simulation. if someone can share the file it will be a great help.
There are an A and B version in the TINA V11 library, original national models - looks like the B is downgraded DC specs. less expensive, this is a slew enhance input stage VFA device - quite a few coming out in that late 1990's time frame - great slew rate, but at the cost of higher noise
LM7171 TINA V11 models.TSC
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In reply to Michael Steffes:
In reply to NAJEEB QURESHI:
You can convert the LM7171 Pspice file for use in TINA-TI:
Steps on how to do this can be found here:
I attached a TINA file with the op amp models in them.
You only require 68V/usec slew rate, and a gain of 20V/V,
look at the OPA684 for a +/-5V low power solution.
How did you calculated that 68V/usec slew rate, and a gain of 20V/V, required for following case? I am trying to learn this is very helpful to select the correct device.
CASE: " I need to amplify 10.7MHz signal. Input is 100mV and output need to 2V."
I will really appreciate your help.
The gain calculation is pretty straightforward, its just your output over your input voltage. In regards to the slew rate, you can use your bandwidth to estimate your needed rise time using the equation 0.35 / 10.7MHz = 32.71ns. From there you can use your output voltage over your rise time to calculate for slew rate = 61.14 V/us. This rise time to bandwidth equation assumes a single pole rolloff of 20dB/dec, Michael is likely giving more margin in the case of any second-order effects causing faster rolloff (such as the peaking seen in the OPA684 datasheet).
In reply to Hasan Babiker31:
I had simply done the sinusoidal peak dV/dT for 2Vpp, 10.7MHz
Peak dV/dT is 2pi10.7Mhz*1Vpeak = 67.1V/usec
The step peak dV/dT is actually quite a lot more complicated than your single pole - if you don't bandlimit a part like the OPA684 to single pole, it will likely have a 2nd order response shape, then, if you hit it with a fast input edge it will try to trace out a 2nd order step response where there will be a peak dV/dT somewhere along the way.
After considerable math, you can estimate the peak dV/dT (which is what you need for slew rate) as 2.85*Vstep*F-3dB.
That appears in the 2nd part of this two part article series.
Thanks Michael, looks like I was calculating for the small-signal rise time rather than for the peak dV/dT that might be needed.
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