Pamaso pa chiwonetsero cha polojekiti ya mapangidwe a RF, amodzi mwamawu odziwika bwino ndi "dB". Kwa injiniya wa RF, dB nthawi zina imakhala yodziwika bwino monga dzina lake. dB ndi gawo la logarithmic lomwe limapereka njira yabwino yofotokozera ma ratios, monga chiŵerengero cha pakati pa chizindikiro cholowetsa ndi chizindikiro chotuluka.
Popeza dB ndi chiŵerengero, ndi gawo limodzi, osati mtheradi. Mpweya wa chizindikiro umayesedwa mwamtheradi, chifukwa nthawi zonse timanena kusiyana komwe kungatheke, ndiko kuti, kusiyana komwe kungakhalepo pakati pa mfundo ziwiri; Nthawi zambiri timanena za kuthekera kwa node yokhudzana ndi 0 V ground node. Chidziwitso chamakono chimayesedwanso mwamtheradi, popeza unit (ampere) imaphatikizapo kuchuluka kwa ndalama kwa nthawi yeniyeni. Mosiyana ndi izi, dB ndi gawo lomwe limaphatikizapo logarithm ya chiŵerengero pakati pa manambala awiri. Mwachitsanzo, kupindula kwa amplifier: Ngati mphamvu ya siginecha yolowera ndi 1 W ndipo mphamvu yotulutsa ndi 5 W, chiŵerengero chake ndi 5, chomwe chimasinthidwa kukhala dB ndi 6.9897dB.
Chifukwa chake, amplifier imapereka mwayi wopeza mphamvu wa 7dB, ndiye kuti, chiŵerengero chapakati pa mphamvu ya siginecha ndi mphamvu ya siginecha yolowera imatha kuwonetsedwa ngati 7dB.
Chifukwa chiyani kugwiritsa ntchito dB?
Ndizotheka kupanga ndi kuyesa machitidwe a RF osagwiritsa ntchito dB, koma zenizeni, dB imapezeka paliponse. Ubwino umodzi ndikuti sikelo ya dB imatilola kufotokoza ziwerengero zazikulu kwambiri osagwiritsa ntchito ziwerengero zazikulu kwambiri: 1,000,000 ili ndi phindu lamphamvu la 60dB yokha. Kuphatikiza apo, kupindula konse kapena kutayika kwa unyolo wa siginecha kuli mu dB domain ndipo ndikosavuta kuwerengera chifukwa manambala a dB amangowonjezeredwa (pamene tigwiritsa ntchito ma ratios wamba, kuchulukitsa kumafunika).
Ubwino wina ndi zomwe timazidziwa kuchokera pazosefera. Makina a RF amazungulira ma frequency ndi njira zosiyanasiyana zomwe ma frequency amapangidwira, kuwongolera, kapena kukhudzidwa ndi zigawo ndi zigawo za parasitic circuit. Mulingo wa dB ndiwosavuta munkhaniyi chifukwa kuyankha pafupipafupi kumakhala kowoneka bwino komanso kowoneka bwino pamene ma frequency axis amagwiritsa ntchito sikelo ya logarithmic ndipo matalikidwe a axis amagwiritsa ntchito sikelo ya dB.
Choncho, popanga fyuluta, m'pofunika kusamala kwambiri.
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Nthawi yotumiza: Mar-04-2022
