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Is this balun bidirectional

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yschuang

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defined in subckt 0 spice

Hello, all

I have a question about the balun which is listed below.
Is this balun bidirectional ?
I can get the balanced signals 'vp' and 'vn' if vd and vc are known.
However, I can not get the unbalanced signals 'vp' and 'vn' if vd and vc are known.

.subckt balun vd vc vp vn
e1 vp vc transformer vd gnd 2
e2 vc vn transformer vd gnd 2
.ends balun
 

yschuang

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Hello, renwl

The following is my spice deck.

*** Balun
.subckt balun vd vc vp vn
e1 vp vc transformer vd gnd 2
e2 vc vn transformer vd gnd 2
.ends balun
*** CKT
vx+ vx+ 0 pwl(0 0 1n 0 1.01n 250m 1000n 250m 1000.1n -250m 2000n -250m 2000.1n 250m)
vx- vx- 0 pwl(0 0 1n 0 1.01n -250m 1000n -250m 1000.1n 250m 2000n 250m 2000.1n -250m)
Xtest vodm vocm vx+ vx- balun
.op
.tran 0.1n 3000n
.lib 'cmos35.txt' nominal
.end

Error messages are the following.
**error** no input to vccs/vcvs at node 0:vodm defined in subckt 0
**error** inductor/voltage source loop found containing 1:e2 defined in subckt balun

Can you tell me how to fix them ? Thanks
 

abcyin

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I remembered that it is not bidirectional, you can get the bidirectional one from designer's guide website, but I'm sorry that I cannot remember the address.
 

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