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Hi allWould you mind if we ask TLV2371?We measured the phase margin and the gain margin using Middle brook method as following.20150220_TLV2371_stablitytest.TSCSo, we could not get the phase margin and the gain margin.If you have some advice, could you let know us? Kind regards,Hirotaka Matsumoto
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Attached is TINA schematic with Loop Gain measured. We do not use Middlebrook method but propose an easier way. For discussion of this and op amp stability look at 4 parts in following link:
TLV2371 Loop Gain.TSC
Tim Green, SMTSPrecision Amplifiers Applications Manager
In reply to John Caldwell:
John san,Thank you for your reply!Ok, we got it!Kind regards,Hirotaka Matsumoto
In reply to Tim Green1:
Tim san,Thank you for your reply!We have one question.The gain margin is the value which is in case of phase 0.(We can see that the gain margin is 20dB.)However, frequency is over 3MHz(Band width).So, in this case, you mentioned 8.88f, could you let know us how to get this value?We need your help.kind regards,Hirotaka Matsumoto
In reply to Hirotaka Matsumoto:
Tim san,We are sorry that our last contribution may make you confuse.You shows the phase margin, so about the gain margin, we can get it by the figure or AC test.Kind regards,Hirotaka Matsumoto
The gain margin can also be read from the loop gain circuit I sent. See attached paper from: faculty.mercer.edu/.../GainMarginandPhaseMargin.pdf
Tim san,Thank you for your cooperation.Hirotaka Matsumoto
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