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current mode interconnect

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Eman kamel

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Hi every body:)
i am trying to design a simple current sensing interconnect , composed of a driver with current Iwin , lossy transmission line with impedance Z0, near and far- end voltage vwin, vout and receiver with termination resistance Rt nad received current Irec, i have 3 simple equations
Iwin=IDsat=(w/2l)*mu*cox* (Vgs -vth)^2 ---> eq (1)
i use vgs=vdd

vout=vwin-IwinZ0 ---> eq(2)

Irec= vout/Rt ---> eq (3)

in my design i use Rt=Z0
Z0=sqrt (Rinterconnect/wC interconnect)
if i use vwin=vdd or vwin=vth ---> i got Irec > Iwin, this does not make sense for me , the recieved current can not be bigger than the driver current after passing on lossy transmission line!!!
so what is wrong with my design? what is the correct value for vwin?
i am working on 45 nm
where IDS=0.00007499939 Ampere
Rt=427.5025 ohm
Z0= 440.1646 ohm
if vwin = 1 v ---> Irec=0.002261947

if vwin=0.18 v --> Irec=0.000343829
would u please advise me

thanks
Eman
 

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