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* lab5c - 5 stage ring osc 
.options list node post 
.model pch pmos 
.model nch nmos 
.tran 1n 10n 
.print tran v(1) v(2) i(vcc) 
.global vcc 
vcc vcc 0 5 
xinv1 1 2_2 inv 
xinv2 2_2 3 inv 
xinv3 3 4 inv 
xinv4 4 5 inv 
xinv5 5 1 inv 
cd1 1 0 1.75p 
.subckt inv in out  
m1 vcc in out vcc pch l=1u w=20u 
m2 out in 0 0 nch l=1u w=20u 
.ends inv 
.end