mirror of
https://github.com/ra3xdh/qucs_s
synced 2025-03-28 21:13:26 +00:00
96 lines
4.8 KiB
Plaintext
96 lines
4.8 KiB
Plaintext
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<Qucs Schematic 1.0.0>
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<Properties>
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<View=-70,-80,1259,760,1,0,0>
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<Grid=10,10,1>
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<DataSet=stab.dat>
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<DataDisplay=stab.dpl>
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<OpenDisplay=0>
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<Script=stab.m>
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<RunScript=0>
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<showFrame=0>
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<FrameText0=Title>
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<FrameText1=Drawn By:>
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<FrameText2=Date:>
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<FrameText3=Revision:>
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</Properties>
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<Symbol>
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</Symbol>
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<Components>
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<IProbe Collector 1 470 170 37 -9 0 3>
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<Vac V2 1 370 120 -24 -57 0 2 "1 V" 1 "1 GHz" 0 "0" 0 "0" 0>
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<_BJT T2 1 220 150 8 -26 1 0 "pnp" 0 "1e-16" 0 "1" 0 "1" 0 "0" 0 "0" 0 "0" 0 "0" 0 "0" 0 "1.5" 0 "0" 0 "2" 0 "300" 1 "1" 0 "0" 0 "0" 0 "0" 0 "0" 0 "0" 0 "30 pF" 1 "0.75" 0 "0.33" 0 "0" 0 "0.75" 0 "0.33" 0 "1.0" 0 "0" 0 "0.75" 0 "0" 0 "0.5" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "26.85" 0 "0.0" 0 "1.0" 0 "1.0" 0 "0.0" 0 "1.0" 0 "1.0" 0 "0.0" 0 "0.0" 0 "3.0" 0 "1.11" 0 "26.85" 0 "1.0" 0>
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<C C4 1 190 400 -26 17 0 0 "1 nF" 1 "" 0 "neutral" 0>
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<GND * 1 470 460 0 0 0 0>
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<C C3 1 580 360 -24 17 0 0 "1 nF" 1 "" 0 "neutral" 0>
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<L L1 1 470 320 10 -26 0 1 "100 nH" 1 "" 0>
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<_BJT T1 1 470 400 8 -26 0 0 "npn" 0 "1e-16" 0 "1" 0 "1" 0 "0" 0 "0" 0 "0" 0 "0" 0 "0" 0 "1.5" 0 "0" 0 "2" 0 "150" 1 "1" 0 "0" 0 "0" 0 "0" 0 "0" 0 "0" 0 "10 pF" 1 "0.75" 0 "0.33" 0 "0" 0 "0.75" 0 "0.33" 0 "1.0" 0 "0" 0 "0.75" 0 "0" 0 "0.5" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "26.85" 0 "0.0" 0 "1.0" 0 "1.0" 0 "0.0" 0 "1.0" 0 "1.0" 0 "0.0" 0 "0.0" 0 "3.0" 0 "1.11" 0 "26.85" 0 "1.0" 0>
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<IProbe Basis 1 410 400 -20 14 0 0>
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<GND * 1 170 210 0 0 0 0>
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<.DC DC1 1 30 580 0 40 0 0 "26.85" 0 "0.001" 0 "1 pA" 0 "1 uV" 0 "no" 0 "150" 0 "no" 0 "none" 0 "CroutLU" 0>
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<.AC AC1 1 200 580 0 40 0 0 "log" 1 "1 Hz" 1 "100 kHz" 1 "100" 1 "no" 0>
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<.SP SP1 0 370 580 0 65 0 0 "lin" 1 "180 MHz" 1 "220 MHz" 1 "200" 1 "no" 0 "1" 0 "2" 0 "no" 0 "no" 0>
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<Eqn Eqn1 1 570 590 -19 13 0 0 "LoopGain=output.v / input.v" 1 "LoopPhase=phase(output.v / input.v)" 1 "yes" 0>
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<Pac P2 1 640 410 23 -32 0 1 "2" 1 "50 Ohm" 1 "0" 0 "1 GHz" 0 "26.85" 0>
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<GND * 1 640 460 0 0 0 0>
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<Pac P1 1 120 450 -95 -26 1 1 "1" 1 "50 Ohm" 1 "0" 0 "1 GHz" 0 "26.85" 0>
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<GND * 1 120 500 0 0 0 0>
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<Diode D2 1 170 60 -37 -11 1 1 "1e-15 A" 0 "1" 0 "10 pF" 0 "0.5" 0 "0.7 V" 0 "0.5" 0 "0.0 fF" 0 "0.0" 0 "2.0" 0 "0.0 Ohm" 0 "0.0 ps" 0 "0" 0 "0.0" 0 "1.0" 0 "1.0" 0 "0" 0 "1 mA" 0 "26.85" 0 "3.0" 0 "1.11" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "26.85" 0 "1.0" 0 "normal" 0>
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<Diode D1 1 170 110 -37 -10 1 1 "1e-15 A" 0 "1" 0 "10 pF" 0 "0.5" 0 "0.7 V" 0 "0.5" 0 "0.0 fF" 0 "0.0" 0 "2.0" 0 "0.0 Ohm" 0 "0.0 ps" 0 "0" 0 "0.0" 0 "1.0" 0 "1.0" 0 "0" 0 "1 mA" 0 "26.85" 0 "3.0" 0 "1.11" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "0.0" 0 "26.85" 0 "1.0" 0 "normal" 0>
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<R R1 1 170 180 -62 -23 1 1 "20k" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
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<R R2 1 470 80 19 -19 0 1 "20" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
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<Vdc V1 1 580 70 18 -26 0 1 "15 V" 1>
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<GND * 1 580 120 0 0 0 0>
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<C C2 1 270 260 -24 18 1 0 "5 uF" 1 "" 0 "neutral" 0>
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<GND * 1 310 270 0 0 0 0>
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<C C1 1 540 260 -39 -57 1 0 "0.1 uF" 1 "" 0 "neutral" 0>
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<GND * 1 580 270 0 0 0 0>
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<R R3 1 220 300 -54 -22 1 1 "10" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
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<L L2 1 220 370 10 -19 0 1 "100 nH" 1 "" 0>
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</Components>
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<Wires>
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<170 150 190 150 "" 0 0 0 "">
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<470 120 470 140 "" 0 0 0 "">
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<220 120 340 120 "input" 300 50 86 "">
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<400 120 470 120 "output" 410 50 10 "">
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<470 430 470 460 "" 0 0 0 "">
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<470 350 470 360 "" 0 0 0 "">
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<470 360 470 370 "" 0 0 0 "">
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<470 360 550 360 "" 0 0 0 "">
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<220 400 380 400 "" 0 0 0 "">
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<220 180 220 260 "" 0 0 0 "">
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<470 200 470 260 "" 0 0 0 "">
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<610 360 640 360 "" 0 0 0 "">
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<640 360 640 380 "" 0 0 0 "">
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<640 440 640 460 "" 0 0 0 "">
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<120 400 160 400 "" 0 0 0 "">
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<120 400 120 420 "" 0 0 0 "">
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<120 480 120 500 "" 0 0 0 "">
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<170 80 170 90 "" 0 0 0 "">
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<170 140 170 150 "" 0 0 0 "">
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<170 20 170 30 "" 0 0 0 "">
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<170 20 470 20 "" 0 0 0 "">
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<470 20 470 50 "" 0 0 0 "">
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<470 110 470 120 "" 0 0 0 "">
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<470 20 580 20 "" 0 0 0 "">
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<580 20 580 40 "" 0 0 0 "">
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<580 100 580 120 "" 0 0 0 "">
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<300 260 310 260 "" 0 0 0 "">
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<310 260 310 270 "" 0 0 0 "">
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<220 260 240 260 "" 0 0 0 "">
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<470 260 470 290 "" 0 0 0 "">
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<470 260 510 260 "" 0 0 0 "">
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<570 260 580 260 "" 0 0 0 "">
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<580 260 580 270 "" 0 0 0 "">
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<220 260 220 270 "" 0 0 0 "">
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<220 330 220 340 "" 0 0 0 "">
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</Wires>
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<Diagrams>
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</Diagrams>
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<Paintings>
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<Arrow 390 200 -20 -60 20 8 #ff0000 3 1 0>
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<Text 320 200 12 #ff0000 0 "for measuring\nthe loop stability">
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<Text 710 130 12 #000000 0 "Circuits of this kind are used to\nstabilize the bias of RF\ntransistors. But sometimes they\ntend to LF oscillations. This\nschematic shows how to\ndetermine the degree of stability\nby simulating magnitude and\nphase margin of the loop gain.\nResult: As a rule of thumb,\nit should be C2 >> C1">
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<Rectangle 80 10 230 190 #000000 0 1 #c0c0c0 1 0>
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<Text 40 170 14 #00007f 90 "bias stabilisation">
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</Paintings>
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