Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
you could use any value of W, L and m factor,
and in fact you could use .scale option in hspice to shink you transitor size, for example, you use a PMOS as W=1000u, L=500u, m=100, at the same time you define .option scale=0.01, so you final Pmos size is w=10000*0.0001=100u, L=500*0.01=50u, m=100.
Added after 2 minutes:
sorry for comfuse,
you define w=10000u, l=500u, m=100
and use .option scale=0.01, then
the fize device size is w=10000*0.01=100u,
L=500*0.01=5u,m=100. good luck.