pvvikas
Newbie level 4
In Hspice, a sub circuit can be defined for an inverter and a scale parameter could be defined like this
.subckt inv in out k=1
xmp out in vdd vdd pfet w='2*k*140n' l=90n
xmn out in gnd gnd nfet w='k*120n' l=90n
.ends
Later, this inverter can be called by using
x1 vin vout inv k=4
here k=4 scales the inverter sizes by 4 times.
I was just wondering if one could do this in Cadence Spectre since it is a really robust and industry standard tool. The sizes for an inverter in Cadence could be defined as 'k*120n' but we cannot call instances of it with different values of 'k' in the higher level schematic.
Please help.
thanks,
Vikas
UT Dallas
.subckt inv in out k=1
xmp out in vdd vdd pfet w='2*k*140n' l=90n
xmn out in gnd gnd nfet w='k*120n' l=90n
.ends
Later, this inverter can be called by using
x1 vin vout inv k=4
here k=4 scales the inverter sizes by 4 times.
I was just wondering if one could do this in Cadence Spectre since it is a really robust and industry standard tool. The sizes for an inverter in Cadence could be defined as 'k*120n' but we cannot call instances of it with different values of 'k' in the higher level schematic.
Please help.
thanks,
Vikas
UT Dallas
