電壓(ya)控(kong)制振幅的(de)振蕩器構造

    電壓(ya)控制振幅的振蕩器，其實就是(shi)(shi)兩個部分組(zu)成的，一(yi)個是(shi)(shi)一(yi)個標準的振蕩器，另一(yi)個是(shi)(shi)壓(ya)控放大(da)(da)器，其增(zeng)益可以(yi)隨輸入電壓(ya)的變化(hua)(hua)而變化(hua)(hua)，理想的變化(hua)(hua)是(shi)(shi)可以(yi)讓它輸出從0到正(zheng)無(wu)窮(qiong)(可輸出大(da)(da)量)的范(fan)圍。

   這樣的電(dian)(dian)路也就是一個AM電(dian)(dian)路(幅度調(diao)(diao)制(zhi)電(dian)(dian)路)，七專級電(dian)(dian)壓調(diao)(diao)振蕩(dang)器廠家，也就是一般中波收音機上那(nei)種調(diao)(diao)制(zhi)方式(shi)。

具體電(dian)(dian)(dian)路可以參(can)考一些AM發(fa)射機(ji)的電(dian)(dian)(dian)路，比如(ru)早期(qi)的中短波對(dui)講機(ji)，都是這種電(dian)(dian)(dian)路。

壓控震蕩器

   壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)簡單的(de)(de)(de)(de)說就是振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)頻(pin)(pin)(pin)率(lv)wo (t)受(shou)控(kong)(kong)制(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)Vc (t)控(kong)(kong)制(zhi)(zhi)(zhi)的(de)(de)(de)(de)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)。壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)一般可(ke)(ke)通過變(bian)(bian)容二(er)級(ji)管來(lai)實現(xian)。因為變(bian)(bian)容二(er)級(ji)管的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)容是承(cheng)外(wai)加偏(pian)置電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)變(bian)(bian)化而變(bian)(bian)化，電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)調(diao)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)廠(chang)家，通過偏(pian)置電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)去控(kong)(kong)制(zhi)(zhi)(zhi)變(bian)(bian)容二(er)級(ji)管電(dian)(dian)(dian)(dian)容的(de)(de)(de)(de)控(kong)(kong)制(zhi)(zhi)(zhi)達到(dao)對(dui)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)頻(pin)(pin)(pin)率(lv)的(de)(de)(de)(de)控(kong)(kong)制(zhi)(zhi)(zhi)。在(zai)鎖相(xiang)環路中壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)輸(shu)(shu)出頻(pin)(pin)(pin)率(lv)是受(shou)鑒(jian)相(xiang)器(qi)(qi)(qi)(qi)(qi)輸(shu)(shu)出的(de)(de)(de)(de)相(xiang)位(或(huo)頻(pin)(pin)(pin)率(lv)）誤差(cha)(cha)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)制(zhi)(zhi)(zhi)，當(dang)壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)頻(pin)(pin)(pin)wo與(yu)輸(shu)(shu)入(ru)(ru)(ru)信(xin)(xin)號的(de)(de)(de)(de)頻(pin)(pin)(pin)率(lv)，七(qi)(qi)專級(ji)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)調(diao)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)廠(chang)家，不(bu)同步時，七(qi)(qi)專級(ji)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)調(diao)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)廠(chang)家，則鑒(jian)相(xiang)器(qi)(qi)(qi)(qi)(qi)兩輸(shu)(shu)入(ru)(ru)(ru)信(xin)(xin)號(ui uo）之(zhi)間(jian)的(de)(de)(de)(de)相(xiang)位差(cha)(cha)Qe是時變(bian)(bian)的(de)(de)(de)(de)，鑒(jian)相(xiang)器(qi)(qi)(qi)(qi)(qi)輸(shu)(shu)出是與(yu)相(xiang)位（頻(pin)(pin)(pin)率(lv)）相(xiang)關的(de)(de)(de)(de)誤差(cha)(cha)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)ud (t)，該誤差(cha)(cha)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)通過低通濾波器(qi)(qi)(qi)(qi)(qi)濾波，加到(dao)壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)上，由于相(xiang)位負(fu)反饋(kui)作用，該控(kong)(kong)制(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)Vc將向(xiang)少(shao)uo與(yu)ui之(zhi)間(jian)的(de)(de)(de)(de)頻(pin)(pin)(pin)率(lv)差(cha)(cha)的(de)(de)(de)(de)方向(xiang)改變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)頻(pin)(pin)(pin)率(lv)，使(shi)壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)頻(pin)(pin)(pin)率(lv)wo與(yu)輸(shu)(shu)入(ru)(ru)(ru)信(xin)(xin)號頻(pin)(pin)(pin)率(lv)同步。所以壓(ya)(ya)(ya)(ya)(ya)(ya)控(kong)(kong)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)器(qi)(qi)(qi)(qi)(qi)可(ke)(ke)看(kan)成電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)——頻(pin)(pin)(pin)率(lv)變(bian)(bian)換器(qi)(qi)(qi)(qi)(qi)。

壓控振蕩器怎么用？

    壓控振蕩器全稱電(dian)壓控制(zhi)振蕩器，通常用VCO(Voltage Controlled Oscillator)表示。是(shi)一種將電(dian)平變換為相應(ying)頻(pin)率的脈沖變換電(dian)路(lu)，或者說是(shi)輸出脈沖頻(pin)率與輸入信號電(dian)平成比例(li)的電(dian)路(lu)。它被(bei)廣泛地應(ying)用在自動控制(zhi)，自動測(ce)量與檢(jian)測(ce)等技術領(ling)域(yu)。

   壓(ya)(ya)(ya)控(kong)振蕩器的(de)控(kong)制(zhi)(zhi)電(dian)(dian)壓(ya)(ya)(ya)可(ke)以有不同(tong)的(de)輸入方式。如用直(zhi)流電(dian)(dian)壓(ya)(ya)(ya)作為(wei)控(kong)制(zhi)(zhi)電(dian)(dian)壓(ya)(ya)(ya)，電(dian)(dian)路(lu)可(ke)制(zhi)(zhi)成(cheng)頻(pin)率調(diao)節十分方便的(de)信號源(yuan)；用正(zheng)弦電(dian)(dian)壓(ya)(ya)(ya)作為(wei)控(kong)制(zhi)(zhi)電(dian)(dian)壓(ya)(ya)(ya)，電(dian)(dian)路(lu)就成(cheng)為(wei)調(diao)頻(pin)振蕩器；而用鋸齒(chi)電(dian)(dian)壓(ya)(ya)(ya)作為(wei)控(kong)制(zhi)(zhi)電(dian)(dian)壓(ya)(ya)(ya)，電(dian)(dian)路(lu)將成(cheng)為(wei)掃頻(pin)振蕩器。