SAIC MG350/360/550/750 ZIPANGIZO ZAMALONDA ZOSAVUTA ZA GALIMOTO Phase modulator – Forward -10025921 Mphamvu yamagetsi CHIPANGIZO CHA MALONDA CHOPEREKA KATUNDU kakatundu wa mg mtengo wotsika kwambiri wa fakitale.

Maziko a kusintha kwa gawo la modulator:

Chizindikiro cha ma frequency a wailesi chimakhala ndi chonyamulira chozungulira mu mawonekedwe a sine wave, chomwe ndi maziko a chizindikiro. Kutalika kwa nthawi yomweyo kumatsatira curve iyi m'njira yabwino kenako yoyipa, kubwerera ku poyambira pambuyo pa kuzungulira konse - kumatsatira curve ya sine wave. Sine wave ingathenso kuyimiridwa ndi kuyenda mozungulira mfundo mu bwalo, ndipo gawo lililonse ndi ngodya pakati pa poyambira ndi mfundo pa waveform. Gawoli limapitanso patsogolo pakapita nthawi, kotero mfundo pa waveform zitha kunenedwa kuti zili ndi kusiyana kwa gawo pakati pawo. Phase modulation imagwira ntchito posintha gawo la chizindikiro, kutanthauza, kusintha liwiro lomwe mfundoyo imayendera mozungulira bwalo. Ngati modulation sigwiritsidwa ntchito, izi zimasintha gawo la chizindikiro. Mwanjira ina, liwiro lozungulira bwalo limasinthidwa poyerekeza ndi avareji. Pachifukwa ichi, ndikofunikira kusintha ma frequency a chizindikiro munthawi yochepa. Mwanjira ina, pamene phase modulation ikugwiritsidwa ntchito pa chizindikiro, pamakhala kusintha kwa ma frequency, ndipo mosemphanitsa. Phase ndi ma frequency zimalumikizidwa mosagawanika chifukwa gawo ndi gawo lofunikira la ma frequency.

CHOLINGA: Kuonjezera kugawa kwa input-output kwa phase modulator yonse popereka zero setting circuit yomwe imapanga signal voltage kuchokera ku driving circuit zero pamene carrier cut-off signal ikugwiritsidwa ntchito. MALANGIZO: Diode switch circuit 10 ndi switch circuit ya low-pass filter type switch circuit ya magawo asanu pogwiritsa ntchito ma PIN diode 12 ndi 14; pamene ma voltages osiyana mu direction akugwiritsidwa ntchito ku ma diode 12 ndi 14 kuchokera ku control circuit 16, switch imayatsidwa ndipo pamene forward voltages ikugwiritsidwa ntchito, ma diode 12 ndi 14 amapanga short circuit, motero amadula carrier. Control circuit 16 imagwiritsa ntchito forward voltages ku ma diode 12 ndi 14 omwe amagwiritsidwa ntchito ndi carrier cut-off signal. Driving circuit 30, pamene carrier cut-off signal ikugwiritsidwa ntchito kudzera mu line 40, imalamulira mwamphamvu chizindikiro cha voltage chomwe chingaperekedwe ma PSK modulator a magawo awiri 20 mpaka zero.