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Isisekelo sokumodulator kwesigaba:

Isignali yefrikhwensi yomsakazo iqukethe oscillating carrier ngendlela ye-sine wave, okuyisisekelo sesiginali. I-amplitude esheshayo ilandela leli jika ngendlela eqondile nebi, ibuyela endaweni yokuqala ngemva komjikelezo owodwa ogcwele - ilandela ijika le-sine wave. Igagasi le-sine lingamelwa futhi ukunyakaza okuzungeza iphuzu eliyisiyingi, futhi isigaba kunoma iyiphi indawo i-Engeli phakathi kwendawo yokuqala kanye nephuzu ku-waveform. Isigaba siphinde sithuthuke ngokuhamba kwesikhathi, ngakho amaphuzu ku-waveform kungathiwa anomehluko wesigaba phakathi kwawo. Ukuguquguquka kwesigaba kusebenza ngokumodela isigaba sesiginali, okungukuthi, ukushintsha izinga lapho iphuzu lihamba khona nxazonke. Uma ukuguquguquka kungasetshenziswa, lokhu kushintsha isigaba sesiginali. Ngamanye amazwi, ijubane lokuzungezisa nxazonke zendilinga liyalungiswa ngokuphathelene nencazelo. Kulokhu, kuyadingeka ukushintsha imvamisa yesiginali ngesikhathi esifushane. Ngamanye amazwi, lapho ukuguquguquka kwesigaba kusetshenziswa esignali, kuba noshintsho lwefrikhwensi, futhi ngokuphambene nalokho. Isigaba kanye nemvamisa kuxhumene ngokungenakuhlukaniswa ngoba isigaba siyingxenye yamafrikhwensi.

INHLOSO:Ukwandisa okokufaka-kokukhiphayo ukuhlukaniswa kwayo yonke imoduli yesigaba ngokunikeza isekethe yokusetha uziro eyenza i-voltage yesiginali isuke kumjikelezo wokushayela uziro uma kusetshenziswa isignali yokunqamula inkampani yenethiwekhi.UMTHETHOSISEKO:Isekhethi ye-Diode switch iyizigaba ezinhlanu. Isifunda sokushintsha uhlobo lwesihlungi esiphansi usebenzisa i-PIN diode 12 no-14; lapho ama-voltages ahluka ekuqondeni asetshenziswa kuma-diode 12 no-14 asuka kumjikelezo wokulawula 16, iswishi iyavula futhi lapho kusetshenziswa ama-voltages angaphambili, ama-diode 12 no-14 aqhuba ukwenza isekethe emfushane, ngaleyo ndlela anqamule ophethe. Umjikelezo wokulawula 16 usebenzisa ama-voltage aya phambili kuma-diode 12 no-14 asetshenziswa ngesignali yokunqanyulwa kwenkampani yenethiwekhi. Isekethe yokushayela engu-30, lapho isignali yokunqanyulwa kwenkampani yenethiwekhi isetshenziswa ngomugqa wama-40, ilawula ngenkani isignali kagesi ukuze inikezwe imodulator ye-PSK yezigaba ezimbili ukuya kuziro.