Ko te diode varactor he diode motuhake i hangaia i runga i te kaupapa ko te kaha o te hononga o te "PN junction" i roto i te diode noa ka taea te huri me te huringa o te ngaohiko whakamuri.

Ko te diode varactor te nuinga e whakamahia ana i roto i te ara iahiko huringa teitei o te waea pūkoro, te raina whenua ranei i roto i te waea waea korekore ki te mohio ki te whakarereketanga o te tohu iti-auau ki te tohu nui-auau me te whakaputa. I roto i te ahua mahi, ka taapirihia te ngaohiko huringa diode varactor ki te electrode kino.

Ka rahua te diode varactor, i te nuinga o te waa ka kitea he rerenga, he ngoikore ranei te mahi:

(1) Ka puta te rerenga, karekau e mahi te ara iahiko huringa auau teitei, ka kino ranei te mahi whakarereke.

(2) I te wa e kino ana te mahi o te varactor, ka kore e mau te mahi o te ara iahiko huringa teitei, a ka tukuna te tohu tere-nui kua whakarereketia ki tera taha, ka riro i te taha o tera taha.

Ka puta tetahi o nga ahuatanga o runga ake nei, me whakakapi te diode varactor o taua tauira.