Ib theem modulator yog lub cheeb tsam uas cov theem ntawm cov cab kuj yog tswj hwm los ntawm kev teeb tsa. Muaj ob hom kev yoj yoj ib sab kev hloov pauv: Theem ncaj theem hloov kho thiab theem tsis ncaj. Lub hauv paus ntsiab lus ntawm kev ncaj qha theem hloov kho yog siv cov teeb tsa hloov kho kom hloov cov dav ntawm cov voj voog resop los ua kom muaj kev hloov pauv ntawm theem thiab cov theem hloov hluav taws xob; Theem Indirect Kev Ua Haujlwm Ua Haujlwm Thawj qauv ua ntej ua ntej ua ntej ua ntej kev hloov pauv mus rau theem hloov pauv, yog li ua tiav theem hloov kho. Hom qauv no tau tsim los ntawm Armstrong xyoo 1933, hu ua Armstrong Tes Kev Kawm Txuj Ci
Ib qho hluav taws xob tswj hwm microwave pharowave peve shifter yog ob qho chaw nres nkoj ob zaug uas tuaj yeem tswj hwm los ntawm cov teeb liab tswj hwm (feem ntau DC Bias Voltage). Tus nqi ntawm theem kev khiav haujlwm tuaj yeem sib cav sib ceg nrog cov teeb liab tswj hwm lossis ntawm lub sijhawm txiav txim siab. Lawv tau hu ua Analog theem ua haujlwm thiab cov theem digital ua raws li. Lub theem modulator yog binary theem hloov pauv cov modulator hauv kev sib txuas lus microwave, uas siv cov phiajcim square me ntsis los hloov kho cov paib cab kuj. Sine yoj theem hloov kho tau tuaj yeem faib ua theem ncaj qha hloov kho thiab theem tsis ncaj. Los ntawm kev siv tus kab sib sau hais tias lub qhov cub ua ke yog qhov sib xyaw ua ke ntau, zaus muaj kev hloov mus ua theem hloov kho (lossis hloov pauv). Ntu siv cov qeb ncaj qha uas feem ntau siv ncaj qha modulator Circuit Court yog cov kwv yees Diode Pase Modulator. Theem Indirect Kev Hloov Tsheb Circuit Court yog qhov nyuaj dua li theem ncaj ncees hloov kho Circuit Court. Nws txoj ntsiab cai yog ib txoj hauv kev ntawm cov paib thauj khoom yog hloov pauv ntawm 90 ° Base-modulator mus rau suppress lub tshuab hluav taws xob ntawm cov cab kuj. Tom qab cov kev ua kom zoo, cov teeb liab tau ntxiv rau lwm txoj kev ntawm cov cab kuj kom tawm cov teeb liab amplition-modulating. Circuit Court yog tus cwj pwm los ntawm kev ruaj khov ruaj khov, tab sis theem hloov tsis tuaj yeem loj heev (feem ntau tsawg dua 15 °) lossis loj distortion. Yooj Yim Pev Hloov Modulator feem ntau siv hauv FM tshaj tawm xov tooj xa tuaj.
