Lub tshuab hluav taws xob muaj feem ntau yog ib qho ntawm cov khoom siv ntsuas hluav taws xob lossis software siv los tsim cov hluav taws xob sib txawv ntawm ntau cov khoom siv ntau zaus. Qee qhov kev siv yoj tshaj plaws uas tsim los ntawm lub tshuab hluav taws xob yog cov sine wave, square wave, triangular wave thiab sawtooth duab. Cov kab hluav taws xob no tuaj yeem ua rau rov ua dua lossis ib qho kev txhaj tshuaj (uas yuav tsum muaj qhov tawm sab hauv lossis sab nraud). [1.
Ntxiv rau kev tsim cov sine vuag, cov tshuab tsim hluav taws xob feem ntau yuav tsim dua lwm qhov kev hloov dua tshiab xws li sawtooth thiab lub voos voos sib npaug, cov voos xwm txheej, thiab cov mem tes. Lwm qhov tshwj xeeb suav nrog ntawm ntau lub tshuab hluav taws xob ua haujlwm muaj peev xwm ntxiv DC offset.
Txawm hais tias lub tshuab hluav taws xob muaj zog npog ob qho suab thiab RF zaus, lawv feem ntau tsis haum rau cov ntawv thov uas xav tau kev sib cais tsawg lossis cov cim hluav taws xob tsawg. Thaum cov sijhawm ntawd yuav tsum tau ua, lwm cov cim qhia lub tshuab hluav taws xob yuav tsim nyog dua.
Qee lub tshuab hluav taws xob muaj peev xwm ua ntu-kaw rau lub teeb liab sab nraud (uas yuav yog qhov siv zaus) lossis lwm lub tshuab hluav taws xob ua haujlwm. [2]
Lub tshuab hluav taws xob muaj nuj nqi tau siv rau hauv kev txhim kho, sim thiab kho ntawm cov khoom siv hluav taws xob. Piv txwv li, lawv yuav siv los ua cov cim teeb liab los kuaj cov amplifiers lossis los qhia qhov teeb meem yuam kev mus rau hauv lub voj tswj. Cov tshuab hluav taws xob muaj nuj nqi yog siv rau kev ua haujlwm nrog cov hluav taws xob sib txuas, cov hluav taws xob ntsig ntsig txog feem yog siv rau kev ua haujlwm nrog digital circuits.
Cov tshuab hluav taws xob ua haujlwm yooj yim feem ntau tsim cov duab peb sab sib zog uas nws lub cev muaj peev xwm tswj tau yooj yim thiab nyob rau hauv cov kauj ruam. Lub voos voos hluav taws xob yog tsim los ntawm kev them nyiaj ib zaug thiab tso tawm lub zog rov qab los ntawm cov khoom siv tas li. Qhov no tsim tawm linearly nce thiab nqis hluav taws xob nruab nrab kem. Raws li qhov tso tawm voltage nce mus txog sab saud lossis qis dua, qhov kev them lossis tawm mus rov qab yog siv lub ntsuas hluav taws xob, tsim tawm cov kab txiav tawm ntawm daim duab peb sab. Los ntawm hloov qhov tam sim no thiab qhov loj ntawm lub capacitor, txawv zaus yuav tau txais. Sawtooth tsis muaj peev xwm tsim tau los ntawm them lub capacitor qeeb, siv tam sim no, tab sis siv cov diode dhau ntawm qhov tam sim no tso tawm kom sai - lub polarity ntawm diode hloov qhov polarity ntawm qhov tshwm sim sawtooth, piv txwv li sawv thiab qeeb caij nplooj zeeg, lossis nce ceev thiab qeeb lub caij nplooj zeeg.
Lub tshuab hluav taws xob muaj zog ua haujlwm muaj peev xwm muab tau ntau zaus txog 20 MHz. Cov tshuab hluav taws xob RF rau ntau dua qhov ntau zaus tsis yog cov tshuab hluav taws xob ua haujlwm hauv qhov kev txiav txim siab txij li lawv ib txwm tsim cov ntshiab los yog hloov kho cov teeb meem sine xwb.
Cov tshuab hluav taws xob muaj nuj nqi, zoo li cov teeb liab hluav taws xob feem ntau, kuj tseem muaj cov attenuator, ntau txoj hauv kev ntawm cov qauv hloov tawm cov zis, thiab feem ntau muaj peev xwm ua haujlwm thiab rov ua dua" cheb" qhov zaus ntawm qhov tso tawm waveform (los ntawm txoj kev ntsuas qhov ntsuas hluav taws xob oscillator) nruab nrab ntawm ob tus neeg teb xov tooj txwv. Qhov no muaj peev xwm ua rau nws yooj yim heev los ntsuas qhov ntsuas cov zaus ntawm ib puag ncig hluav taws xob.
Cim npe nrov: muaj nuj nqi tshuab hluav taws xob, tuam ntxhab, yuav, tus nqi qis, hauv Tshuag
