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Aug 18th, 2019, 8:16am
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Methods to find ICMR of rail-to-rail amplifier (Read 279 times)
Pooja
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Methods to find ICMR of rail-to-rail amplifier
Mar 01st, 2019, 5:31am
 
Hello,
I have designed Rail-to-Rail amplifier. I have done DC simulation for ICMR using Voltage follower configuration. but as per my professor my output is limited , so i am not getting exact ICMR.  Attached image has ICMR which i have got from DC Analysis.
Please, suggest me another methods to find out ICMR.
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icmr.png
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Ken Kundert
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Re: Methods to find ICMR of rail-to-rail amplifier
Reply #1 - Mar 2nd, 2019, 10:25am
 
ICMR is input common mode range, no?

The way I would measure input common mode range is to sweep the input common mode voltage while performing a fixed-frequency AC analysis. The end of the range will be characterized by the drop in gain. The gain should be flat over the range and should drop off outside the range.  If it is a DC coupled amplifier, I would set the frequency to 0.

-Ken
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Pooja
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Re: Methods to find ICMR of rail-to-rail amplifier
Reply #2 - Mar 4th, 2019, 8:30am
 
Thank you.
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