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what to tweak for getting required VCM? in LVDS

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kumar123

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Hi Experts,

Can any body give me an idea on how to derive a required VCM(common mode Voltage) , i am just desining based on "Andrea Boni" IEEE paper method where in i just used 6 transistors 1NMOS for tail current source and 1 PMOS on top as a current source , middle 4 NMOS as a current switches

now i am able to see a swing(p-p) of 400mV but not on VCM of 1.2 which i wanted it to be ,i.e now the deisgn shwos VOUT = 0.7V and VOUTN = 0.3V but i wanted it to be VOUT= 1.4 and VOUTN=1.0 meaning i wanted to boost VCM from 0.5 to 1.2V but did not understand on which parameter to tweak ?

i have used RA and RB of 100k with 1.2V constant source and terminated OUT and OUTN with 100Ohms and doing the simulations(but i don't understand why should i use 1.2 V using higher resistive network )
without this as well i am not seeing any significant difference exept 1uV in swing

Thanks & Regards
Kumar
 

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