I-phase modulator yisekethe apho i-phase ye-carrier wave ilawulwa yi-modulating signal. Kukho iintlobo ezimbini ze-sine wave phase modulation: i-direct phase modulation kunye ne-indirect phase modulation. Umgaqo we-direct phase modulation kukusebenzisa i-modulating signal ukutshintsha ngokuthe ngqo iiparameter ze-resonant loop, ukuze i-carrier signal nge-resonant loop ivelise i-phase shift kwaye yenze i-phase modulation wave; Indlela ye-indirect phase modulation kuqala iguqula i-amplitude ye-modulated wave, ize iguqule i-amplitude change ibe yi-phase change, ukuze kufezekiswe i-phase modulation. Le ndlela yadalwa ngu-Armstrong ngo-1933, ebizwa ngokuba yi-Armstrong modulation method.
I-microwave phase shifter elawulwa ngekhompyutha yinethiwekhi enamachweba amabini esetyenziselwa ukubonelela ngomahluko wesigaba phakathi kweempawu zokuphuma kunye nezokufaka ezinokulawulwa yisignali yokulawula (ngokubanzi i-DC bias voltage). Ubungakanani besigaba sokutshintsha bunokwahluka ngokuqhubekayo ngesignali yokulawula okanye ngexabiso elimiselweyo. Zibizwa ngokuba zii-analog phase shifters kunye nee-digital phase shifters ngokwahlukeneyo. I-phase modulator yi-binary phase shift keying modulator kwinkqubo yonxibelelwano lwe-microwave, esebenzisa i-continuous square wave ukulungelelanisa isignali yenkampani. I-Sine wave phase modulation inokwahlulwa ibe yi-direct phase modulation kunye ne-indirect phase modulation. Ngokusebenzisa ulwalamano lokuba i-sine wave amplitude I-Angle iyinxalenye ye-instantaneous frequency, i-frequency modulated wave inokuguqulwa ibe yi-phase modulated wave (okanye ngokuchaseneyo). I-direct phase modulator circuit esetyenziswa kakhulu yi-varactor diode phase modulation modulation circuit. I-indirect phase modulation circuit iyinkimbinkimbi kune-direct phase modulation circuit. Umgaqo wayo kukuba enye indlela yesignali yenkampani itshintshwa yi-90° phase shifter kwaye ingena kwi-balanced amplitude-modulator ukuze icinezele i-amplitude modulation yenkampani. Emva kokunciphisa ngokufanelekileyo, isignali efunyenweyo yongezwa kwenye indlela yenkampani ukuze ikhuphe isignali yokulawula i-amplitude. Le sekethe ibonakaliswa kukuzinza kwamaza aphezulu, kodwa utshintsho lwesigaba alunakuba lukhulu kakhulu (ngokubanzi ngaphantsi kwe-15°) okanye ukuphazamiseka okukhulu. I-modulator yesigaba esilula idla ngokusetyenziswa kwii-transmitters zosasazo lwe-FM.
