Modulator y'icyiciro ni urujya n'uruza aho icyiciro cy'umuraba utwara imizi kigenzurwa n'ikimenyetso cyo guhindura. Hari ubwoko bubiri bwa modification y'icyiciro cya sine: modification y'icyiciro cya direct na modification y'icyiciro kitaziguye. Ihame rya modification y'icyiciro cya direct ni ugukoresha ikimenyetso cyo guhindura imizi kugira ngo uhindure neza ibipimo bya resonant loop, kugira ngo ikimenyetso cy'umuraba ginyuze muri resonant loop kibone phase shift kandi kibe umuraba wa modulation y'icyiciro; Uburyo bwa modification y'icyiciro kitaziguye bubanza guhindura amplitude y'umuraba wa modulated, hanyuma bugahindura amplitude modification mo phase change, kugira ngo hagerwe ku modification y'icyiciro. Ubu buryo bwashinzwe na Armstrong mu 1933, bwitwa Armstrong modulation method
Imashini ihindura imikorere ya microwave igenzurwa n'ikoranabuhanga ni umuyoboro w'ibice bibiri ukoreshwa mu gutanga itandukaniro ry'ibyiciro hagati y'ibisohoka n'ibimenyetso byinjiye bishobora kugenzurwa n'ikimenyetso cyo kugenzura (muri rusange voltage ya DC bias). Ingano y'ihinduka ry'ibyiciro ishobora gutandukana buri gihe bitewe n'ikimenyetso cyo kugenzura cyangwa ku gaciro kagenwe. Bitwa analog phase shifters na digital phase shifters. Imashini ihindura imikorere ni modulator ihindura imikorere ya binary phase shift muri sisitemu y'itumanaho rya microwave, ikoresha umuraba uhoraho kare kugira ngo ihindure ikimenyetso cy'umutwara. Sine wave phase modulation ishobora kugabanywamo modulation ya direct phase na indirect phase modulation. Hakoreshejwe isano iri hagati y'uko sine wave amplitude Angle ari igice cy'umuraba uhita uhinduka, umuraba uhindura imikorere ushobora guhinduka umuraba uhindura imikorere (cyangwa ibinyuranye). Imashini ihindura imikorere ya direct phase modulator ikunze gukoreshwa cyane ni varactor diode phase modulation modulation. Imashini ihindura imikorere ya indirect phase modulation iragoye kurusha direct phase modulation circuit. Ihame ryayo ni uko inzira imwe y'ikimenyetso cy'umutwara ihindurwa na 90° phase shifter hanyuma ikinjira muri amplitude-modulator ikurikije uburyo bwo guhagarika modulation ya amplitude ya carrier. Nyuma yo kugabanya neza, ikimenyetso cyabonetse cyongerwa ku yindi nzira y'icyuma gitwara amajwi kugira ngo gisohore ikimenyetso gihindura amplitude. Iyi circuit irangwa no kudahindagurika cyane, ariko ihinduka ry'itsinda ntirishobora kuba rinini cyane (muri rusange riri munsi ya 15°) cyangwa guhinduka gukomeye. Modulator yoroheje y'itsinda ikunze gukoreshwa mu byuma bitanga amajwi bya FM.
