[Moved]: Loop stablity of TIA

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To measure the loop gain of the TIA, the outer feedback loops have to be broken - and by this the feedforward transmission, too. This is accomplished by the 2 IPROBEs which are transparent for DC (resistance=0), but show infinite impedance for ac frequencies.
 



i doubt why the author duplicate the forward feedback loop,he add a iprobe at OUTP,OUTN,i cann't find which loopgain to be simulated.
why not add the iprobe at the output of TIA directly?
 

chenximing4305 said:
i doubt why the author duplicate the forward feedback loop
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Because it is a fully differential TIA, isn't it?

chenximing4305 said:
why not add the iprobe at the output of TIA directly?
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Because loops should be broken preferably in front of a high impedance node (MOSFET gate input). This wouldn't be the case at the output.
 

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