After SPICE extraction from SUE, Im getting transistors sizes that are a factor of 1u less than what I specified. Whats going on?
Let’s take a look at where the problem arised. In SUE, when you edit the parameters of transistors, the numbers you entered are automatically assumed to be in units of ‘um’. When you use, say, ‘2*ln_min’ to be the width of transistors, your SPICE deck would read like: .SUBCKT inverter in out WP=2*lp_min LP=lp_min WN=1 LN=ln_min M_0 out in gnd gnd n W=’WN*1u’ L=LN ad=’arean(WN,sdd)’ as=’arean(WN,sdd)’ + pd=’perin(WN,sdd)’ ps=’perin(WN,sdd)’ Naturally, you have just defined a transistor with width of 2*0.25u*1u. The remedy one of the following:- Avoid using syntacs like 2*lp_min for width of transistors defined in SUE Replace “WP=2*lp_min” with “WP=2*0.25”. Note that the macros AD, PD, AS and PS require the WP to be defined in units of um.
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