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Actually calculate impedance

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This commit is contained in:
Jeremy Soller 2019-01-11 17:30:06 -07:00
parent 3f93fdd4ee
commit 21118c1bd3
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1 changed files with 44 additions and 18 deletions

62
script/impedance
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@ -1,5 +1,7 @@
#!/usr/bin/env python3
from subprocess import check_call
# All units in um
COPPER_OZ = 35.0
@ -114,32 +116,56 @@ for i, layer in enumerate(stackup):
print(" Track", track["name"])
w = track["width"]
s = track["spacing"]
filename = "build/" + layer["name"] + "_" + track["name"] + ".bmp"
if len(dielectrics) == 1:
# microstrip
er1 = dielectrics[0]["er"]
h1 = dielectrics[0]["thickness"]
print(" Coupled Microstrip", "t", t, "w", w, "s", s, "er1", er1, "h1", h1)
h = dielectrics[0]["thickness"]
er2 = dielectrics[0]["er"]
print(
" Microstrip Coupler",
"t", t,
"w", w,
"s", s,
"h", h,
"er", er2
)
g = 1000 # TODO
print("create_bmp_for_microstrip_coupler", w, s, g, h1, t, 1.0, er1)
er1 = 1.0
g = 5 * h # TODO
check_call([
"create_bmp_for_microstrip_coupler",
str(w),
str(s),
str(g),
str(h),
str(t),
str(er1),
str(er2),
filename
])
check_call([
"atlc",
"-S",
"-d",
"ac82ac=" + str(er2),
filename
])
elif len(dielectrics) == 2:
# asymmetric stripline
er1 = dielectrics[0]["er"]
h1 = dielectrics[0]["thickness"]
er2 = dielectrics[1]["er"]
h2 = dielectrics[1]["thickness"]
print(" Coupled Asymetric Stripline", "t", t, "w", w, "s", s, "er1", er1, "h1", h1, "er2", er2, "h2", h2)
print(
" Asymmetric Stripline Coupler",
"t", t,
"w", w,
"s", s,
"h1", h1,
"er1", er1,
"h2", h2,
"er2", er2
)
# TODO
else:
raise Exception("missing reference")
# create_bmp_for_microstrip_coupler \
# w \
# s \
# g \
# h \
# t \
# er1 \
# er2 \
# filename