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Questions about an opamp based integrator problem

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OMEsystem

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An integrator problem

Please refer to the attachment.
I have an opamp based integrator Fig.1, If I would like to analyze the loop
gain and its response, the schematic should be connected as Fig.2. (1) Is it right?
In addition to this, I have another question, If the opamp is replaced by an
OTA, do I need to count the feedback C when I calculate the phase margin
of OTA? If the OTA is single stage, (2) does the Feedback C helps the stability?
(3) Do I need to count the R when I calculate the phase margin of OPamp?
 

safwatonline

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An integrator problem

i think figure two shows a comparator,followed by diffrentiator , i dont see its relation with figure 1
 

nxing

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An integrator problem

figure 2 is not the equavlent circuit of Fig1. please check it more closely
 

pfd001

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An integrator problem

you can use fig.2 to simulate the open loop characteristic of the opa, where the input parasitic capacitance must be inclded in parallel with R.
 

OMEsystem

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Re: An integrator problem

pfd001 said:
you can use fig.2 to simulate the open loop characteristic of the opa, where the input parasitic capacitance must be inclded in parallel with R.

pfd001, thank,
I know you really know what I want.
By the way, Can we use the feedback C to compensate the opamp?
 

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