33 lines
704 B
Plaintext
33 lines
704 B
Plaintext
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** Example S--parameters of a Tschebyschef Low Pass filter
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C1 in 0 33.2p
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L1 in 2 99.2n
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C2 2 0 57.2p
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L2 2 out 99.2n
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C3 out 0 33.2p
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V1 in 0 dc 0 ac 1 portnum 1 z0 50
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V2 out 0 dc 0 ac 0 portnum 2 z0 50
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.sp lin 100 2.5MEG 250MEG ; use for Tschebyschef
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.control
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run
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let S11db = db(s_1_1)
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let S12db = db(s_1_2)
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let S21db = db(s_2_1)
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let S22db = db(s_2_2)
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settype decibel S11db S21db S22db S12db
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let P11=180*ph(s_1_1)/pi
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let P21=180*ph(s_2_1)/pi
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let P22=180*ph(S_2_2)/pi
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let P12=180*ph(S_1_2)/pi
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settype phase P11 P21 P22 P12
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set xbrushwidth=2
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plot s11db s21db S22db S12db ylimit -0.5 0 ; used with Tschebyschef
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plot P11 P21 P22 P12
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plot smithgrid S_1_1 S_1_2
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.endc
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.end
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