@Amro Tork @Farag Elsayed I have a question regarding the HBT device and its CDL netlist. In the unit tests I could find the following:

.SUBCKT npn13G2
Q1 C1 B1 E1 sub! npn13G2 le=900.0n we=70.00n m=1
Q2 C2 B2 E2 sub! npn13G2 le=900.0n we=70.00n m=2
Q3 C3 B3 E3 sub! npn13G2 le=900.0n we=70.00n m=4
.ENDS

however this netlist lack number of emitter

Nx

parameter and the

m

multiplier can be skipped together with

we

which has a fixed value. In the case of

npnG2l

and

npnG2v

devices there exist a second parameter

le

which has to be considered.

• For the

npn13G2

[Fixed Device], we track the following parameters:

AE

,

PE

, and

m

. The

AE

and

PE

values are calculated from the

we

and

le

values provided in the netlist, if not already specified. The

m

parameter represents the number of emitters. • Regarding the

Nx

and

Ny

parameters (number of columns and rows), we have agreed to ignore them. • Details for extraction: ◦ For `npn13G2`: The device will be extracted if it has the same

we

and

le

values. Therefore, the comparison will primarily focus on the

m

parameter, as

AE

and

PE

values will already match. ◦ For

npn13G2l

and `npn13G2v`: The device will be extracted if it has the same

we

value and its

le

value falls within the specified range in the documentation. In this case, the comparison will focus on the

AE

,

PE

, and

m

parameters.

Ok so

m

represents the number of emmiters

Yes

it is a little bit confusing since usually it is used as a device multiplier

image.png

could you please change it to Nx and situate it on the first place in the parameter list ?

I thought both are the same, no of emitters and multipliers.

ok, so I will stream the Nx parameter in lvs_format as m

Not sure I got that. But in lvs the

m

parameter represents the total number of devices that have same connections. So if we have BJT with Nx=3 & Ny=3, the

m

parameter will be

3*3

. In cdf, we have the

m

parameter which is different than the

Nx

we do not support 2 dimensional devices, only Nx can be changed

Great, so yes. The

Nx

should be same as

m

ok, I have updated the symbols