Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"       扭環(huán)形計數(shù)器，又稱為約翰遜計數(shù)器，是為了提高觸發(fā)器的利用率而設(shè)計的。它將Q3'與串行輸入端D0相連，其反饋邏輯函數(shù)為D0=Qn-1'。圖附2.53和附2.55給出了由4個D觸發(fā)器構(gòu)成的扭環(huán)形計數(shù)器和它的狀態(tài)轉(zhuǎn)換圖。由狀態(tài)轉(zhuǎn)換圖可知，該電路有兩個狀態(tài)循環(huán)，若取其中一個為有效循環(huán)，則另一個為無效循環(huán)。每個循環(huán)有8個狀態(tài)。因此，電路的循環(huán)長度比環(huán)形計數(shù)器長一倍，觸發(fā)器的利用率提高了。由于每輸入一個時鐘脈沖后，電路就轉(zhuǎn)換到一個新的狀態(tài)，若用電路的不同狀態(tài)表示已經(jīng)輸入的脈沖數(shù)，則電路具有計數(shù)功能，該電路可以作為模八計數(shù)器。" 

EncryptionType: 2
UsingVectorGraphics: 0
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