Modulator ya gawo ndi dera lomwe gawo la mafunde onyamula limayendetsedwa ndi chizindikiro chowongolera. Pali mitundu iwiri ya sine wave phase modulation: direct phase modulation ndi indirect phase modulation. Mfundo ya direct phase modulation ndikugwiritsa ntchito chizindikiro chowongolera kusintha mwachindunji magawo a resonant loop, kuti chizindikiro chonyamula kudzera mu resonant loop chipange phase shift ndikupanga phase modulation wave; Njira yowongolera indirect phase choyamba imasintha amplitude ya modulated wave, kenako imasintha amplitude kusintha kukhala phase change, kuti ikwaniritse phase modulation. Njira iyi idapangidwa ndi Armstrong mu 1933, yotchedwa Armstrong modulation method.
Chosinthira cha microwave chomwe chimayendetsedwa ndi magetsi ndi netiweki ya madoko awiri yomwe imagwiritsidwa ntchito kupereka kusiyana kwa gawo pakati pa zizindikiro zotuluka ndi zolowera zomwe zimatha kulamulidwa ndi chizindikiro chowongolera (nthawi zambiri DC bias voltage). Kuchuluka kwa kusintha kwa gawo kumatha kusiyana mosalekeza ndi chizindikiro chowongolera kapena pamtengo wokhazikika. Amatchedwa analog phase shifters ndi digital phase shifters motsatana. Phase modulator ndi binary phase shift keying modulator mu microwave communication system, yomwe imagwiritsa ntchito continuous square wave kuti isinthe chizindikiro chonyamula. Sine wave phase modulation ingagawidwe mu direct phase modulation ndi indirect phase modulation. Pogwiritsa ntchito ubale womwe sine wave amplitude Angle ndi yofunika kwambiri pa instantaneous frequency, frequency modulated wave ingasinthidwe kukhala phase modulated wave (kapena mosemphanitsa). Direct phase modulator circuit yomwe imagwiritsidwa ntchito kwambiri ndi varactor diode phase modulation module. Indirect phase modulation circuit ndi yovuta kwambiri kuposa direct phase modulation circuit. Mfundo yake ndi yakuti njira imodzi ya carrier signal imasinthidwa ndi 90° phase shifter ndikulowa mu balanced amplitude-modulator kuti ichepetse amplitude modulation ya carrier. Pambuyo pochepetsa bwino, chizindikiro chomwe chapezeka chimawonjezedwa ku njira ina ya chonyamulira kuti chitulutse chizindikiro chowongolera ma amplitude. Dera ili limadziwika ndi kukhazikika kwa ma frequency ambiri, koma kusintha kwa gawo sikuyenera kukhala kwakukulu kwambiri (nthawi zambiri kochepera 15°) kapena kusokoneza kwakukulu. Simple phase modulator nthawi zambiri imagwiritsidwa ntchito mu ma transmitter a FM.
