Mismatch of MOSFET small signal parameters under analog operation

The matching behavior of drain current I/sub D/ and small signal parameters transconductance g/sub m/ and differential output conductance g/sub DS/ of MOSFETs is investigated under typical analog operating conditions. Whereas for the normalized standard deviations of I/sub D/ and g/sub m/ the well known proportionality to (W/spl times/L/sub eff/)/sup -1/2/ is obtained, the normalized standard deviation of g/sub DS/ clearly deviates from this width and length dependence. For this parameter, a proportionality to W/sup -1/2/ is found.