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  1. <Qucs Schematic 0.0.19>
  2. <Components>
  3. <GND * 1 270 380 0 0 0 0>
  4. <GND * 1 370 520 0 0 0 0>
  5. <Pac P1 5 270 350 -86 -9 0 1 "1" 0 "50 Ohm" 1 "0 dBm" 0 "1 GHz" 0 "26.85" 0>
  6. <R R4 5 370 490 19 -6 0 1 "220 Ohm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  7. <C C4 5 320 300 -22 -36 0 0 "C1" 1 "" 0 "neutral" 0>
  8. <GND * 1 570 390 0 0 0 0>
  9. <GND * 1 650 520 0 0 0 0>
  10. <R R3 5 650 490 16 -10 0 1 "270 Ohm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  11. <R R2 5 570 360 15 -7 0 1 "R2" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  12. <SPfile X1 5 570 300 -68 -42 0 0 "NE02103.s2p" 1 "rectangular" 0 "linear" 0 "open" 0 "2" 0>
  13. <GND * 1 750 380 0 0 0 0>
  14. <Pac P2 5 750 350 -39 59 0 1 "2" 0 "50 Ohm" 1 "0 dBm" 0 "1 GHz" 0 "26.85" 0>
  15. <C C3 5 700 300 -19 -34 0 0 "C2" 1 "" 0 "neutral" 0>
  16. <R R1 5 450 230 -20 -31 0 0 "R1" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  17. <L L1 5 570 230 -24 -32 0 0 "10 nH" 1 "" 0>
  18. <L L2 5 370 370 -51 -12 0 1 "L2" 1 "" 0>
  19. <L L3 5 650 370 13 -10 0 1 "L3" 1 "" 0>
  20. <C C5 5 370 260 18 -10 0 1 ".01 uF" 1 "" 0 "neutral" 0>
  21. <R R5 5 420 300 -18 15 0 0 "R3" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  22. <R R6 5 500 440 -25 13 0 0 "6.8 k" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
  23. <Vnoise V1 1 490 300 -18 21 0 2 "1e-19" 1 "0" 0 "1" 0 "0" 0>
  24. <.SP SP1 1 260 440 0 82 0 0 "lin" 0 "10 MHz" 1 "500 MHz" 1 "101" 0 "no" 0 "1" 0 "2" 0 "no" 0 "no" 0>
  25. <.AC AC1 1 820 480 0 48 0 0 "lin" 0 "10 MHz" 1 "500 MHz" 1 "101" 0 "yes" 0>
  26. <Eqn Eqn2 1 1060 460 -24 15 0 0 "C1=2.7e-9" 1 "C2=2.7e-9" 1 "L1=6.4e-8" 1 "L2=1.15e-7" 1 "L3=1.39e-7" 1 "R1=2.7e2" 1 "R2=8.2" 1 "R3=8.2" 1 "yes" 0>
  27. <Eqn Eqn1 1 880 170 -30 16 0 0 "Gain_delta=max(dB(S[2,1]))-min(dB(S[2,1]))" 1 "Noise_Fig=20*log10(Vout.vn/4.55e-10)" 1 "Gain_dB=dB(S[2,1])" 1 "Input_RL=dB(S[1,1])" 1 "Input_RL_opt=min(abs(Input_RL))" 1 "Output_RL_opt=min(abs(Output_RL))" 1 "Output_RL=dB(S[2,2])" 1 "yes" 0>
  28. <.Opt Opt1 0 120 200 0 48 0 0 "Sim=SP1" 0 "DE=3|50|2|20|0.85|1|3|1e-6|10|100" 0 "Var=R3|yes|1.893332E+001|10|30|LIN_DOUBLE" 0 "Var=L3|yes|1.391039E-007|1e-8|2e-7|LIN_DOUBLE" 0 "Var=L2|yes|1.148903E-007|5e-8|5e-7|LIN_DOUBLE" 0 "Var=R2|yes|8.171219E+000|5|12|LIN_DOUBLE" 0 "Var=R1|yes|2.867975E+002|100|500|LIN_DOUBLE" 0 "Var=L1|yes|6.385347E-008|1e-8|1e-7|LIN_DOUBLE" 0 "Var=C1|yes|2.676456E-009|5e-10|7e-9|LIN_DOUBLE" 0 "Var=C2|yes|2.497671E-009|8e-10|3e-9|LIN_DOUBLE" 0 "Goal=Gain_dB|GE|10" 0 "Goal=Input_RL_opt|GE|20" 0 "Goal=Output_RL_opt|GE|20" 0 "Goal=Gain_delta|LE|.3" 0>
  29. </Components>
  30. <Wires>
  31. <370 290 370 300 "" 0 0 0 "">
  32. <350 300 370 300 "" 0 0 0 "">
  33. <270 300 270 320 "" 0 0 0 "">
  34. <270 300 290 300 "" 0 0 0 "">
  35. <600 300 650 300 "" 0 0 0 "">
  36. <750 300 750 320 "" 0 0 0 "">
  37. <730 300 750 300 "" 0 0 0 "">
  38. <370 230 420 230 "" 0 0 0 "">
  39. <650 300 670 300 "" 0 0 0 "">
  40. <650 230 650 300 "" 0 0 0 "">
  41. <600 230 650 230 "" 0 0 0 "">
  42. <480 230 540 230 "" 0 0 0 "">
  43. <370 300 370 340 "" 0 0 0 "">
  44. <370 400 370 440 "" 0 0 0 "">
  45. <650 300 650 340 "" 0 0 0 "">
  46. <650 400 650 440 "" 0 0 0 "">
  47. <370 300 390 300 "" 0 0 0 "">
  48. <650 440 650 460 "" 0 0 0 "">
  49. <530 440 650 440 "" 0 0 0 "">
  50. <370 440 370 460 "" 0 0 0 "">
  51. <370 440 470 440 "" 0 0 0 "">
  52. <520 300 540 300 "" 0 0 0 "">
  53. <450 300 460 300 "" 0 0 0 "">
  54. <730 300 730 300 "Vout" 760 230 0 "">
  55. </Wires>
  56. <Diagrams>
  57. <Rect 290 930 240 160 3 #c0c0c0 1 00 1 0 1e+08 5e+08 1 -40 10 0.1 1 -1 1 1 315 0 225 "Frequency, Hz" "" "" "">
  58.     <"Output_RL" #ff0000 0 3 0 0 0>
  59.       <Mkr 2.501e+08 -150 -224 3 0 0>
  60.   </Rect>
  61. <Rect 620 920 240 160 3 #c0c0c0 1 00 1 0 1e+08 5e+08 0 -40 10 0.1 1 -1 1 1 315 0 225 "Frequency, Hz" "" "" "">
  62.     <"Output_RL" #ff0000 0 3 0 0 0>
  63.       <Mkr 3.726e+08 239 -220 3 0 0>
  64.   </Rect>
  65. </Diagrams>
  66. <Paintings>
  67. <Text 190 570 12 #000000 0 "Optimization of small signal UHF amplifier for input/output return loss and flat gain response.\nA noise figure estimate is provided for information only and the bias resistors are estimates.\nNoise source, V1, is the estimated noise figure of the transistor at operating bias conditions.\nThe 10 nanohenry inductor is the approximate parasitic inductance of the feedback network.\nTo optimize, disable equation 2 and enable optimization.">
  68. <Text 190 160 12 #ff0000 0 "Place desired S-parameter file in C:\\Users\\<user name>\\.qucs\\">
  69. <Text 610 530 12 #000000 0 "Vcc">
  70. </Paintings>
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