MC12148芯片應(yīng)用電路設(shè)計(jì) 11頁 2500余字

摘要:
MC12148需要一個(gè)包含電容和電感的外部并聯(lián)電路.它同時(shí)也需要一個(gè)變?nèi)荻O管以給振蕩器提供可變電壓輸入.這種裝置在配備固定時(shí)鐘頻率的情況下 也也應(yīng)用在其它許多的領(lǐng)域.配備一個(gè)振蕩器,MC12148在許多領(lǐng)域的的應(yīng)用可謂理想.系統(tǒng)需要包含電子測試裝置和數(shù)字高速信號.
MC12148是建立MC1648可變電壓輸入電路拓樸基礎(chǔ)上.它已經(jīng)實(shí)現(xiàn)了利用摩托羅拉MOSAIC 高級雙極處理技術(shù).這種技術(shù)成功產(chǎn)生了一種設(shè)計(jì)比MC1648更高的頻率.
MC12148的ECL輸出圖不是一種傳統(tǒng)的的開放開發(fā)射器輸出結(jié)構(gòu),而是包含有500ohm微量限壓電阻.這種附加功能使鄰近輸出變成了一條連續(xù)傳送線.正因?yàn)檫@種輸出結(jié)構(gòu)的存在,用于使輸出的外部下拉電阻就不需要 帶直流電路徑的輸出功率.這種輸出的目的就是使ECL積蓄能量.如果使用者需要輸出信號,就得使用一個(gè)ELC緩沖器.

Abstract:
The MC12148 requires an external parallel tank circuit consisting of theinductor (L) and capacitor (C). A varactor diode may be incorporated into thetank circuit to provide a voltage variable input for the oscillator (VCO). Thisdevice may also be used in many other applications requiring a fixedfrequency clock.
The MC12148 is ideal in applications requiring a local oscillator. Systemsinclude electronic test equipment and digital high–speedtelecommunications.
The MC12148 is based on the VCO circuit topology of the MC1648. TheMC12148 has been realized utilizing Motorola’s MOSAIC III advancedbipolar process technology which results in a design which can operate at amuch higher frequency than the MC1648......


目 錄


1. MC12148簡介……………………………………………1

2.MC12148電氣特性………………………………………..2

3.MC12148的芯片封裝與引腳功能………………………..3

4. MC12148內(nèi)部電路結(jié)構(gòu)………………………………….5

5 MC12148應(yīng)用電路的設(shè)計(jì)……………………………….6

6. .MC12148芯片的三視圖…………………………………7

7.相關(guān)說明……………………………………………………8

8.個(gè)人總結(jié)……………………………………………………9

9.參考文獻(xiàn)……………………………………………………11