Dab tsi yog hom kev tsis lees paub qhov piv?

Cov txheej txheem:

Dab tsi yog hom kev tsis lees paub qhov piv?
Dab tsi yog hom kev tsis lees paub qhov piv?
Anonim

Hauv cov khoom siv hluav taws xob, hom kev tsis lees paub qhov sib piv ntawm qhov sib txawv amplifier yog ib qho kev ntsuas siv los ntsuas lub peev xwm ntawm cov cuab yeej tsis kam lees cov cim hom hom, piv txwv li cov uas tshwm sim ib txhij thiab hauv-theem ntawm ob qho kev nkag.

hom kev tsis lees paub qhov piv piv txhais li cas?

Qhov sib piv-hom kev tsis lees paub qhov piv (CMRR) ntawm sib txawv cov tswv yim qhia txog lub peev xwm ntawm cov tswv yim los tsis lees txais cov tswv yim tawm tswv yim uas muaj rau ob qho kev tawm tswv yim. Lub siab CMRR yog ib qho tseem ceeb thaum lub teeb liab ntawm kev txaus siab yog qhov hloov pauv me me ntawm qhov hluav taws xob hloov pauv ntawm qhov hluav taws xob loj (loj) offset.

Dab tsi yog qhov zoo sib xws hom kev tsis lees paub piv?

Ideally, CMRR is infinite. Tus nqi raug rau CMRR yuav yog 100 dB. Hauv lwm lo lus, yog tias ib qho op amp muaj ob qho tib si xav tau (piv txwv li, qhov sib txawv) thiab cov cim hom sib txawv ntawm nws cov tswv yim uas yog tib yam, cov teeb liab hom hom yuav yog 100 dB me dua qhov xav tau ntawm cov zis tawm.

txhais tau li cas los ntawm kev tsis lees txais hom sib txawv hauv lub tshuab hluav taws xob sib txawv?

Kev tsis lees paub hom hom yog lub peev xwm ntawm qhov sib txawv amplifier (uas nyob nruab nrab ntawm oscilloscope thiab kev sojntsuam raws li lub teeb liab-kub preamp) txhawm rau tshem tawm cov hom hluav taws xob ntau los ntawm cov zis. … Txawm hais tias nws yog vim li cas, nws tsis yog qhov voltage hom uas txaus siab, tab sis qhov txawv qhov voltage.

CMRR xam li cas?

CMRR yog qhov taw qhia ntawm lub peev xwm. … 1) thiabAcom yog hom kev nce qib (qhov nce nrog rau Vn hauv daim duab), CMRR yog txhais los ntawm cov kab zauv hauv qab no. CMRR=Adiff /Acom=Adiff [dB] - Acom [dB] Piv txwv li, NF txawv amplifier 5307 CMRR yog 120 dB (min.)

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