Thong beo khoa hoc 2001<br />
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NGH EN cuu C<br />
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ETJ).O KHUEC<br />
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DJ)..IPHO<br />
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ESA-69<br />
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NgUY~ll Due Hoa - Djllh<br />
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Sy Hiell<br />
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Bai bdo dua ra mot thitt kt cht tao khuech dai pho' kt hat nhdn vai muc dich ruing<br />
cao cdc dijt trung cua no ciing nhu cho phep loai bi) duac hi~u ling chong chdp xung bdng<br />
cdc mach ht5i phuc duang khong BLR va hieu ling tich tu di~n tich bdng phuang phdp hinn<br />
thanh xung tich phtin c6'ng GL.<br />
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I.<br />
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nAT VAN BE:<br />
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Trong toan bQ h~ thong ph6 ke' hat nhan, khuech dai ph6 ke' (KBPK) conhiern vu<br />
khuech dai va xii'I9 tin hieu Ia'y ra tir ti~n khuech dai (P.Amp) d6 dira tdi cac bQ bien d6i<br />
nrong nr thanh so' (ADC) hoac ca thie't bi di~n tii' khac a sau d6. KBPK Ia mot kh6i dien tii'<br />
chirc nang quan trong, c6 anh huang mang tinh quyet dinh tdi dQ chinh xac ciia phep do<br />
birc xa. VI. vay, van d~ nang cao cac d?c tnrng ciia KBPK luon dU