Question

Microelectronics 2

The below circuit is driving a speaker. We need to measure the quiescent points to ensure proper biasing. The collector voltage is 1.5V indicating that Q1 operates in the active region. However, we still observe no gain in the circuit. If Is = 5 X 104A and VA = 00, compute the B of the transistor. Explain why the circuit providers no gain. TVcc = 2.5 V 100 k g R$150 Vout Di na maging sa magna mata

Answer 1

Selalior "The brlo Girais de Regsired inlernica y varining Collegor Vunge F65V - Vi a = 5*104 Calcunalet Compute the f of the transsictor to frorsilor orrt Circuit hole have to chlained the pots providers no gain, its Gere) looke & R 2 = 10 {Н , ha - we used the dc aralysits then Capacitors open its, O VCC -0.5V ILA 1ook

Je me (DOKA then, Collector Connenst is, aco Is CVE) = [5x10-11] [4.92x10] Dc = 2.46410-5 amp. - we have to used a KYLoop apply to the input loop @ -2.5ti BClook)to.=0 iB (look) – 18 = 0 is clook)= 1.8 i B=18 lib. t.8.4105 lamp Collector Current of B is, Sc: B* 1 B 100-K BE4C - @ EL gubtituted the colla in &? , cx get.

Therefore, B f the barssilelor ics (1.3611) and alo Oblained the trans Conductance and input resiliane ond au purto resilllane is Screo Joan Jeans Corxbuckince = gonore on Corckickarsco - YT 2.116.8 105 0026 Tgn = 9.4615x10 Tout Slane Tarta gm 103611 9.416-810-4 - [14-CILE -* out parte pocillore rostro .616X los - J

-andl, also oblained the Circuit provides again or not) Vinput I peiro / Du er for Circait c 5) we have to obtained KCl Ezuation Gere KCL apply at Vo Vo + you tgenler Ed RC RC le tue -- Om VTT Ve Rut VoRC = ug mimo RCRL RCRL 1o CRL+RC) = ja VI VOC Retrus Egon voolucre) Ko [1000+8) --com Kamex C10008) Vo [1099] = 9.41615*10-5C8000) Yo = Q.42615*10 -* 8000 (1008)

Vo vin = 0.15692 2008 [Gain = 0.00075 ki 1. is than gain less Then There fore, Gain is not the circuit. provides