Wada's model does not apply to memories with column multiplexing.
Our model allows column multiplexing using NMOS pass transistors
between several pairs of bitlines and a shared sense amp.
In our model, the degree of column multiplexing
(number of pairs of bitlines per sense amp) is
.
Although we use the
same sense amp as Wada's model, we precharge the bitlines to two NMOS
diodes less than 
since the sense amp performs poorly with a common-mode
voltage of .