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I am designing a current-mode passive mixer which consists of gm,mixer core and tia stages. The mixer core is ac coupled to the first stage. I wonder about the input offset voltage of tia, is it feedback by the resistor or other ways?
I tried to use the feedback resister. The input and output...
if the function of mos fet in saturation region is used:
i=1/2*ucw/l*(vgs-vth)^2
which ignore the second order effect;
to analyse the character of gm''(the second derivative of gm) of a simple full differential amplifier,then is the result helpful for design? or it is unreasonable?
why?
thx~
The system is a three-stage-inverter tia(trans-impedence amplifier) with multiple feedbacks.The feedbacks are between every two of the three inverters.
How to show that the system is stable?The simulation tool I used is Hspice~
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