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Text File | 1987-08-30 | 11.3 KB | 397 lines

NETWORK.DOC.....Documentatioε fo≥ thσ prograφ NETWORK.BA╙. Compute≥ modelinτ oµ electrica∞ network≤ i≤ ß rea∞ timσ save≥ fo≥ R╞ ì engineers« Engineerinτ CA─ (Compute≥ AideΣ Design⌐ program≤ includσ ì basicall∙ tw∩ type≤ oµ software║ analytica∞ anΣ synthesis« Analytica∞ ì softwarσ derive≤ thσ circui⌠ characteristic≤ sucΦ a≤ gaiε anΣ phasσ froφ ì giveε componen⌠ values« Synthesi≤ doe≤ jus⌠ thσ reverse¼ startinτ witΦ ì desireΣ circui⌠ characteristic≤ sucΦ a≤ filte≥ type¼ bandwidth¼ anΣ rollofµ ì t∩ derivσ thσ componen⌠ value≤ required« Thσ prograφ includeΣ iε thi≤ ì librar∙ analyze≤ ß passivσ ladde≥ o≥ cascadeΣ network« Onσ valuablσ usσ oµ ì thi≤ prograφ i≤ analysi≤ anΣ verifacatioε oµ existinτ circui⌠ designs« ì Using the editor function, it is also possible to optimize a circuit design. Mos⌠ R╞ network≤ caε bσ modeleΣ a≤ ß serie≤ oµ cascadeΣ circui⌠ ì element≤ sucΦ a≤ serie≤ o≥ paralle∞ (shunt⌐ resistors¼ capacitor≤ o≥ ì inductors« Thσ 1╖ circui⌠ model≤ includeΣ iε thi≤ prograφ ma∙ bσ cascadeΣ ì t∩ forφ almos⌠ an∙ typσ oµ filter¼ impedancσ matchinτ network¼ o≥ ì transmission line network. Thi≤ prograφ allow≤ yo⌡ t∩ ente≥ componen⌠ value≤ anΣ obtaiε ß char⌠ oµ ì insertioε loss¼ returε loss¼ VSWR¼ reflectioε coefficien⌠ (Rho)¼ anΣ botΦ ì rea∞ anΣ imaginar∙ inpu⌠ impedances« Circuit≤ ma∙ bσ completel∙ modeleΣ ì beforσ thσ breadboarΣ stage¼ savinτ mucΦ timσ witΦ hanΣ calculation≤ o≥ ì trial and error in the lab. NETWORK.BA╙ i≤ designeΣ t∩ ruε unde≥ MBASI├ o≥ BASIC-8░ anΣ doe≤ no⌠ ì require any specific terminal type or printer type. è CIRCUIT MODELS ------- ------ Type 1: Series resistance. (R) *--RRRRR--* *---------* Type 2: Paralell resistance. (R) *----+----* | R R R R | *----+----* Type 3: Series inductance. (L) *--LLLLL--* *---------* Type 4: Paralell inductance. (L) *----+----* | L L L L | *----+----* Type 5: Series capacitance. (C) *--CCCCC--* *---------* Type 6: Paralell capacitance. (C) *----+----* | C C C C | *----+----* è Type 7: Series - Series RLC *--RRRRR--LLLLL--CCCCC--* *-----------------------* Type 8: Paralell - Series RLC *----+----* | R R R | L L L | C C C | *----+----* Type 9: Series - Paralell RLC --RRRRR-- | | *--+--LLLLL--+--* | | --CCCCC-- *---------------* Type 10: Paralell - Paralell RLC *--+-----+-----+----* | | | R L C R L C R L C | | | *--+-----+-----+----* Type 11: Series - Series RL/Series - Paralell C *-+-RRRRR--LLLLL-+-* | | ---CCCCC------ *------------------* è Type 12: Transmission line (Stripline) *------------------* *------------------* Type 13: Open paralell stub. *-----+------------* | *-----)--+---------* | | | | | | Type 14: Shorted paralell stub. *-----+------------* | *-----)--+---------* | | | | | | -- Type 15: Open series stub. | | | | *-----+ +-------* *----------------* Type 16: Shorted series stub. ---- | | | | *------+ +-----* *-----------------* Type 17: Transformer. *-----+ :: +-------* ) :: ( ) :: ( ) :: ( ) :: ( *-----+ :: +-------* èPROGRAM DESCRIPTION ------- ----------- Thσ prograφ i≤ divideΣ int∩ fou≥ sections║ datß input¼ datß editor¼ ì computation and data output. Unit≤ useΣ iε thσ prograφ havσ beeε optimizeΣ fo≥ usσ a⌠ R╞ anΣ arσ iε ì ohms¼ nanohenries¼ picofarads¼ inches¼ degree≤ anΣ megahertz« Thσ maximuφ ì numbe≥ oµ circui⌠ section≤ ha≤ beeε se⌠ t∩ 3░ bu⌠ thi≤ i≤ jus⌠ arbitrar∙ a≤ ì most computers have more than enough memory to allow more sections. Thσ prograφ als∩ allow≤ network≤ t∩ bσ saveΣ anΣ retreiveΣ froφ disδ ì files. This feature can save you much time and effort at entering elements. PROGRAM EXAMPLE ------- ------- Example 1: Impedance match to a real load. 50 ohms 318 nH +---XXXXXX---*-----+-----*---LLLLL----*----+ | | | / \ C X | ~ | C 637 pF X 10 ohms \ / C X | | | +------------*-----+-----*------------*----+ : : : Element # RS : 1 : 2 : RL : : : Element type -- : 6 : 3 : -- : : : Let≤ tr∙ ß simplσ examplσ iε orde≥ t∩ becomσ familia≥ witΦ thσ prograφ ì operation« Star⌠ witΦ thσ circui⌠ iε Examplσ 1« Thi≤ i≤ ß low-pas≤ ì impedancσ matchinτ networδ tha⌠ i≤ useΣ t∩ matcΦ ß 5░ ohφ sourcσ (RS⌐ t∩ ß ì 5░ ohφ resistivσ loaΣ (RL⌐ a⌠ 1░ Mhz« Wσ wil∞ verif∙ tha⌠ thσ matcΦ take≤ ì placσ a⌠ 1░ Mh· anΣ theε determinσ thσ │ d┬ cut-ofµ frequency¼ thσ returε ì loss and the VSWR within the pass-band. Afte≥ loadinτ anΣ runninτ thσ program¼ thσ firs⌠ questioε i≤ iµ thσ ì networδ i≤ ß (N)E╫ o≥ (S)AVE─ network« Ente≥ "N"¼ theε thσ screeε wil∞ ì clea≥ anΣ asδ fo≥ thσ numbe≥ oµ circui⌠ sections« Ente≥ 2« Remembe≥ no⌠ t∩ ì coun⌠ thσ sourcσ (RS⌐ anΣ loaΣ (RL⌐ resistances« Nex⌠ thσ prograφ wil∞ asδ ì fo≥ thσ valuσ oµ thσ sourcσ resistance« Ente≥ 50« Thσ prograφ wil∞ theε ì star⌠ loopinτ througΦ thσ networδ elements« Ente≥ thσ networδ typσ numbe≥ ì anΣ thσ componen⌠ value≤ a≤ prompted« Fo≥ eacΦ elemen⌠ numbe≥ (#⌐ ß listinτ ì oµ thσ possiblσ elemen⌠ type≤ wil∞ bσ displayed« Ente≥ elemen⌠ typσ ╢ ì (paralel∞ C⌐ anΣ ß capacitancσ oµ 63╖ pF« Nex⌠ ente≥ elemen⌠ typσ │ (serie≤ ì L⌐ witΦ aε inductancσ oµ 31╕ nH« Afte≥ yo⌡ havσ entereΣ al∞ oµ thσ circui⌠ ì element≤ yo⌡ wil∞ bσ askeΣ fo≥ thσ valuσ oµ thσ loaΣ resistance« Ente≥ 1░ ì ohms. At this point the data entry is completed. Nex⌠ yo⌡ wil∞ bσ askeΣ fo≥ thσ startinτ frequency¼ ste≡ frequenc∙ anΣ ì thσ numbe≥ oµ steps« Fo≥ screeε outpu⌠ thi≤ shoulΣ bσ 2░ o≥ less« Fo≥ ì printe≥ outpu⌠ thi≤ ma∙ bσ increaseΣ a≤ desired« Ente≥ ß startinτ frequenc∙ ì oµ ▒ Mhz¼ ß ste≡ frequenc∙ oµ ▒ Mh· anΣ 2░ steps« Nex⌠ yo⌡ wil∞ bσ prompteΣ ì fo≥ screeε o≥ printe≥ output« ResponΣ witΦ "Só o≥ "P"« Thσ screeε wil∞ ì clea≥ anΣ afte≥ ß shor⌠ dela∙ thσ result≤ wil∞ bσ displayeΣ oε thσ screeε ì (S) o≥ on both the screen and the printer (P). Wheε thσ calculation≤ arσ complete¼ yo⌡ shoulΣ obtaiε thσ result≤ showε ì iε thσ tablσ below« Notσ tha⌠ a⌠ 1░ Mh· thσ sourcσ (5░ ohms⌐ i≤ indeeΣ ì matcheΣ t∩ thσ loaΣ (1░ ohms)« A⌠ thi≤ poin⌠ thσ insertioε los≤ i≤ zer∩ d┬ ì anΣ thσ returε los≤ i≤ nearl∙ 6▓ d┬ anΣ thσ VSW╥ i≤ 1.00:1« Als∩ notσ tha⌠ ì thσ reflectioε coeffecien⌠ (RHO⌐ i≤ zero¼ thσ rea∞ par⌠ oµ thσ inpu⌠ ì impedancσ (ZIN(R)⌐ i≤ nea≥ 5░ ohm≤ anΣ thσ imaginar∙ par⌠ oµ thσ inpu⌠ ì impedancσ (ZIN(I)⌐ i≤ zer∩ ohms« Notσ tha⌠ thσ cut-ofµ frequenc∙ i≤ abou⌠ ì 14.5 Mhz. è ========================================== RF NETWORK ANALYSIS PROGRAM - VER 1.0 CP/M ========================================== NETWORK LISTING: ELEM TYPE R L C (ZO) (L) (E) SOURCE R 50 1 6 0 0 637 2 3 0 318 0 LOAD R 10 NOTE: R,L,C ARE FOR ELEMENT TYPES 1-11. ZO,L,E, ARE FOR ELEMENT TYPES 12-16. ========================================= FREQ(MHZ) IL(DB) RL(DB) VSWR RHO ZIN(R) ZIN(I) 1.00 -2.51 -3.57 4.93 0.66 10.15 1.60 2.00 -2.40 -3.72 4.74 0.65 10.60 3.25 3.00 -2.21 -4.00 4.42 0.63 11.42 4.98 4.00 -1.94 -4.43 4.01 0.60 12.72 6.83 5.00 -1.61 -5.08 3.52 0.56 14.70 8.81 6.00 -1.23 -6.08 2.97 0.50 17.71 10.86 7.00 -0.82 -7.63 2.42 0.42 22.30 12.72 8.00 -0.43 -10.27 1.88 0.31 29.34 13.50 9.00 -0.12 -15.51 1.40 0.17 39.40 10.76 10.00 0.00 -61.93 1.00 0.00 49.92 0.00 11.00 -0.15 -14.69 1.45 0.18 51.31 -18.94 12.00 -0.62 -8.73 2.15 0.37 39.42 -33.26 13.00 -1.40 -5.60 3.21 0.52 25.36 -36.35 14.00 -2.40 -3.73 4.73 0.65 15.73 -33.77 15.00 -3.52 -2.56 6.84 0.75 10.01 -29.98 16.00 -4.69 -1.80 9.67 0.81 6.64 -26.47 17.00 -5.86 -1.30 13.35 0.86 4.58 -23.53 18.00 -7.00 -0.97 17.97 0.89 3.28 -21.12 19.00 -8.09 -0.73 23.70 0.92 2.42 -19.15 20.00 -9.13 -0.57 30.68 0.94 1.83 -17.51 Followinτ thσ outpu⌠ data¼ ß shor⌠ men⌡ i≤ displayeΣ a⌠ thσ bottoφ oµ ì thσ screen« Therσ arσ fivσ option≤ listeΣ iε thσ menu╗ (1⌐ swee≡ ì frequency¼ (2⌐ edi⌠ elements¼ (3⌐ star⌠ over¼ (4⌐ qui⌠ anΣ (5⌐ savσ file« ì A⌠ thi≤ point¼ yo⌡ caε changσ frequenc∙ rangσ o≥ direc⌠ outpu⌠ t∩ thσ ì printe≥ witΦ optioε (1)« O≥ yo⌡ caε edi⌠ thσ elemen⌠ value≤ t∩ "finσ tuneó ì you≥ circui⌠ witΦ optioε (2)« Optioε (3⌐ wil∞ allo≈ yo⌡ t∩ star⌠ ove≥ witΦ ì ß ne≈ o≥ saveΣ network« Optioε (4⌐ exit≤ thσ prograφ bacδ t∩ MBASIC« Thσ ì last option (5) allows you to save the current network to a disk file. Wheε savinτ ß filσ t∩ disk¼ onl∙ ente≥ thσ namσ oµ thσ filσ wheε ì prompteΣ no⌠ thσ filσ exten⌠ eτ LOWPAS╙ no⌠ LOWPASS.NET« Thσ exten⌠ oµ .NE╘ ì is automatically added by the program. NOTE║ Bσ surσ thσ filσ namσ yo⌡ picδ doe≤ no⌠ duplicatσ onσ alread∙ oε ì thσ disδ unles≤ yo⌡ wisΦ t∩ overwritσ thσ olΣ file« Thσ prograφ wil∞ no⌠ ì let you know that the file already exists. PROGRAM HISTORY ------- ------- Thi≤ prograφ i≤ deriveΣ froφ onσ writteε b∙ KennitΦ Wyat⌠ oµ TR╫ ì Electroniπ Product≤ Division« Hi≤ prograφ wa≤ writteε fo≥ thσ IB═ P├ anΣ ìèincludeΣ ß featurσ t∩ creatσ hΘ resolutioε graphiπ plot≤ oµ thσ data« ╔ wa≤ ì forceΣ t∩ dro≡ thi≤ featurσ whilσ convertinτ thσ prograφ t∩ CP/═ becausσ m∙ ì termina∞ doe≤ no⌠ havσ thσ capibilit∙ t∩ d∩ graphics« Iµ yo⌡ wisΦ t∩ adΣ ì thi≤ featurσ t∩ you≥ cop∙ oµ thσ program¼ pleasσ contac⌠ mσ oε GENIE« M∙ ì mai∞ addres≤ therσ i≤ W.MUNSON« ╔ wil∞ givσ yo⌡ thσ informatioε oε ho≈ hσ ì did it and you should be able to take it from there. Good luck and enjoy.