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序號(hào) 元器件名功能描述生產(chǎn)廠商資料下載
MAX4178 330MHz, Gain of !/Gain of @ Closed-L... MAXIM MAX4178PDF下載
MAX4178 330MHz, Gain of !/Gain of @ Closed-L... MAXIM [Maxim Integrated Products] MAX4178PDF下載
MAX4178EPA 330MHz, Gain of !/Gain of @ Closed-L... MAXIM MAX4178EPAPDF下載
MAX4178EPA 330MHz, Gain of !/Gain of @ Closed-L... MAXIM [Maxim Integrated Products] MAX4178EPAPDF下載
MAX4178ESA 330MHz, Gain of !/Gain of @ Closed-L... MAXIM MAX4178ESAPDF下載
MAX4178ESA 330MHz, Gain of !/Gain of @ Closed-L... MAXIM [Maxim Integrated Products] MAX4178ESAPDF下載
MAX4178EUA 330MHz, Gain of !/Gain of @ Closed-L... MAXIM MAX4178EUAPDF下載
MAX4178EUA 330MHz, Gain of !/Gain of @ Closed-L... MAXIM [Maxim Integrated Products] MAX4178EUAPDF下載
MAX4178MJA 330MHz, Gain of !/Gain of @ Closed-L... MAXIM MAX4178MJAPDF下載
MAX4178MJA 330MHz, Gain of !/Gain of @ Closed-L... MAXIM [Maxim Integrated Products] MAX4178MJAPDF下載

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歷史最低報(bào)價(jià)：￥0.0000 歷史最高報(bào)價(jià)：￥0.0000 歷史平均報(bào)價(jià)：￥0.0000

美國(guó)ADI公司模擬乘法器AD834的原理與應(yīng)用
頻與高頻功放電路，形成發(fā)射信號(hào)。采用ad834構(gòu)成的擴(kuò)頻調(diào)制器電路如圖3所示，實(shí)質(zhì)上它是一個(gè)psk調(diào)制器，調(diào)制碼信號(hào)(ttl電平)經(jīng)rc耦合、分壓后轉(zhuǎn)換成±1v的雙極性非歸零碼，加到x2輸入端，x1經(jīng)c16交流接地，r15作為控制失調(diào)電壓的平衡電阻；臥式晶振輸出的70mhz信號(hào)以c20、r19耦合到y(tǒng)1輸入端，y2經(jīng)c19交流接地，r16是輸入端平衡電阻；ad834的差分輸出信號(hào)經(jīng)電容c22、c32耦合到中心頻率為70mhz、帶寬為4mhz的聲表面波濾波器濾波(本級(jí)插入損耗為12db)，然后加到max4178的緩沖輸出級(jí)(本級(jí)電壓放大倍數(shù)為1)。70mhz擴(kuò)頻輸出信號(hào)中心頻率的穩(wěn)定度取決于晶振的頻率穩(wěn)定度，信號(hào)帶寬取決于調(diào)制碼的頻率。該調(diào)制器電路的最終輸出信號(hào)幅度為40mv。 530)this.width=530" border=0>點(diǎn)擊此處查看全部新聞圖片 4.2 agc電路本通信設(shè)備要求agc的控制深度達(dá)70db。agc電路對(duì)70mhz中放輸出的信號(hào)取樣，然后輸出射頻agc電壓和中頻agc電壓，分別用于控制接收機(jī)高放和二中放的增益，以適應(yīng)天線輸入0.5μv～0.5v的動(dòng)態(tài)范圍

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