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Chng 1: MK hi tipTh.S. Nguyn Thanh Tun B mn Vin thng (B3) [email protected]
Ni dung Tng quan v MK hi tip Hi tip m/dng Hi tip p/dng Sai lch p/dng
Phn tch MK hi tip p Sai lch p Sai lch dng
Thit k MK hi tip p
Mch khuch i hi tip
Hi tip p, sai lch p
ly mu in p ng ra Vo v a ra in p hi tip Vb v ghp ni tip vi in p ng vo Vin ca bn thn b khuch i.
Phn tch mch
Theo nh ngha, li p thun ca mch khuch i c hi tip:
Theo nh ngha, li p thun ca mch khuch i khng c hi tip:
Nhn xt :T < < -1 : mong mun hot ng khi : Avf = Av \ (-T) = 1 \ Kv khng ph thuc vo AV nn mch n nh hn Theo nh ngha tr khng ng vo nhn t ngun dng:
Vi :
Theo nh ngha tr khng ng ra :
Vi :
li vng T :
Vy :
Hi tip p, sai lch dng
ly mu in p ng ra l Vo v a ra in p hi tip Vb v ghp song song vi dng in ng vo iin ca bn thn b khuch i.
Phn tch mch
T mch trn ta c : Dng sai lch : Dng ti :
Theo nh ngha, li dng thun ca mch khuch i c hi tip:
Theo nh ngha, li dng thun ca mch khuch i khng c hi tip:
li vng T :
Vy :
Nhn xt : 0 < T < 1 : Hi tip dng Aif > Ai : tng cng khuch i T = 1 : Aif = to xung dao ng => ng dng trong mch to sng
T< 0 : Hi tip m Aif < Ai T < < -1 : mong mun hot ng khi : Aif = Ai \ (-T) = 1 \ ( RL . Gi ) khng ph thuc vo Ai nn mch n nh hn
Theo nh ngha tr khng ng vo nhn t ngun dng:
Vi Zi l tr khng ng vo khi khng hi tip : Gi = 0
Theo nh ngha tr khng ng ra :