ÐÀÑ×ÅÒ ÝËÅÌÅÍÒΠÂÛÑÎÊÎ×ÀÑÒÎÒÍÎÉ ÊÎÐÐÅÊÖÈÈ ÓÑÈËÈÒÅËÜÍÛÕ ÊÀÑÊÀÄΠÍÀ ÁÈÏÎËßÐÍÛÕ ÒÐÀÍÇÈÑÒÎÐÀÕ - ñòð. 8

                            à)                                                      á)

Ðèñ. 4.1

 ñîîòâåòñòâèè ñ [1], êîýôôèöèåíò ïåðåäà÷è êàñêàäà â îáëàñòè âåðõíèõ ÷àñòîò, ïðè âûáîðå ýëåìåíòîâ êîððåêöèè

 è  ñîîòâåòñòâóþùèìè îïòèìàëüíîé ïî Áðàóäå ôîðìå À×Õ, îïèñûâàåòñÿ âûðàæåíèåì:

,                                    (4.1)

ãäå   

;

        

 - íîðìèðîâàííàÿ ÷àñòîòà;

        

;

        

;

        

;                                                                                             (4.2)

        

;                                                                      (4.3)

        

 - ãëóáèíà ÎÎÑ;                                                                  (4.4)

        

;                                                                                    (4.5)

        

;                                                                                     (4.6)

        

.                                                                      (4.7)

Ïðè çàäàííîì çíà÷åíèè

, çíà÷åíèå  îïðåäåëÿåòñÿ âûðàæåíèåì:

.                                    (4.8)

Ïîäñòàâëÿÿ èçâåñòíûå

 è  â (4.1) íàéäåì:

,                    (4.9)

ãäå   

.

Âõîäíîå ñîïðîòèâëåíèå êàñêàäà ñ ýìèòòåðíîé êîððåêöèåé ìîæåò áûòü àïïðîêñèìèðîâàíî ïàðàëëåëüíîé RC-öåïüþ [1]:

;                           (4.10)

.                               (4.11)

Ïðèìåð 4.1. Ðàññ÷èòàòü

, , , ,  êàñêàäà ñ ýìèòòåðíîé êîððåêöèåé, ñõåìà êîòîðîãî ïðèâåäåíà íà ðèñóíêå 4.1, ïðè èñïîëüçîâàíèè òðàíçèñòîðà ÊÒ610À (äàííûå òðàíçèñòîðà ïðèâåäåíû â ïðèìåðå 2.1) è óñëîâèé: = 0,9; = 10; = 100 Îì.

Ñîäåðæàíèå  Íàçàä  Âïåðåä

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