Straight taper

[Douglas]

Hi all,
Still on tapers, but now on a linear one. I am facing one issue when trying to define a taper inside a function. Some additional polygons are appearing.
Here’s the code.

import nazca as nd
import nazca.interconnects as IC

nd.add_layer2xsection(xsection='slabXS', layer=10, accuracy=0.001)

icSlab = IC.Interconnect(width=0.49, radius=10, xs='slabXS')

def slabTaper(length=3.0, ribWidth=0.49, slabWidth=2.0):
    with nd.Cell(name='SlabTaper_{}_{}'.format(length,slabWidth)) as bb:
#Place Taper
        chTaper = icSlab.taper(length=length,width1=ribWidth,width2=slabWidth)
        chTaper.put(0,0)
#Put Pins
        nd.Pin('a0', pin=chTaper.pin['a0']).put()
        nd.Pin('b0', pin=chTaper.pin['b0']).put()
#Put stubs
        nd.put_stub()
    return bb

functionTaper = slabTaper(length=4.0, ribWidth=0.49, slabWidth=2.0)
variableTaper = icSlab.taper(length=4.0,width1=0.49,width2=2.0)

functionTaper.put(0,0)
variableTaper.put(0,5)
        
nd.export_gds(filename='tapers.gds')

Any idea if that is an issue and on how to solve that?

Thanks,
Douglas

[Ronald]

Dear Douglas,

The “extra polygons” you see are stubs to visualize connections between components.
You do not need stubs on interconnects, as interconnects are their own stubs already.

Solution: remove the nd.put_stub()

Ronald

[Douglas]

Ah ok!

But like this I also lose the names of the ports, right?

Is there a way to see the port names and not these additional polygons as in other building blocks?

Thanks,

Douglas

[Ronald]

Dear Douglas,

To see the pinname and arrow but not the xsectional info of the stub:

nd.put_stub([], length=0)
# [] assumes a stub for all pins in the cell.

or

nd.put_stub(['a0', 'b0'], length=0)
# explicitly set a stub for pin 'a0' and 'b0'.

Ronald

[Douglas]

Not sure am doing it right, but when I add

# Export nodes
nd.Pin('a0', pin=inTpr.pin['a0']).put()
nd.Pin('b0', pin=outTpr.pin['a0']).put()
# Put stubs
nd.stub([], length=0)
nd.put_stub()

inside my cell definition, I get a:

AttributeError: module ‘nazca’ has no attribute ‘stub’

Is this the right place to put it?

[Ronald]

My typo mistake. I corrected it in the original code line above.

[Douglas]

Thanks!
All set.

PS: did you guys managed to check my other issue with the bent tapers. I am getting some spurious points on the code I created, maybe I missed something… Thanks

[Author]

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