Question

Find the midband gain, and low 3 dB cutoff frequency of the amplifier given below. *Please indicate all pole and zero frequencies associated with capacitors. Draw small signal equivalent cicuits. Show all work so that partial credit can be given. (*VBE= 0,7 V, V1=25 mV). +5 V 오 B=100 r = 50 kg 1,3 kΩ 10 uF 20 kΩ 10 uF Rig O TH 2 ΚΩ 10 uF 30 k 2 Tous w 1 ΚΩ =

Answer 1

nc Analysis 5v 1,3K It VE 0.7 vih (3) RED [2x] Ie 5 *3* vin= = 3V - so 201130= 12KR KUL in LOOP 5-3 z IB 12+ 101*1.3 IB= 13.956 MA Ic = ß Ig = 1,3956 SA Ic =(+B) IB =1.4096A Ad EC = 5-1.31€ -IC 25- VGC 1.77192V QEL, Ic) O point Q (1.77 V, 1.3456 m.) Ac parametrs 8 = VT TIB 2 25m luk 13.956m 1.791 kr CS Scanned with cann Scanner

Mide-band voltare ช gmon = ß z) Igme Blon 9m2 100 ms 1.791 . 9 m = 55.824 ms to equivalent circuit Csmal si VO B Rsr9 W 2ki Rc 115 usig 80 Rin 1215 1779 115 g.mk sok I fain ve VT = Aum voz-9m (roll Rc) VT VO 2-gm Croll Rc) VI Avm 2-55.824.* (solli] Aum = -54.729 ulu CS Scanned with CamScanner

3) Lowu 308 cut-che frequencés fe Base = for G 24 = 3 2 lourf fLE milte = fcg fc collector - ter fe Base Rsig CF Lour H 215 Rh XT 1.791 Susig Ri fc4= 27 G. (R sig +R) - fa 2a *10*16*3.5567103 Ifa= 4.47 HZ fa @gmun 80 R Sok 15 tat 27 € CrollR) faa 0.162 HZ CS Scanned with CamScanner

VI 4 Ifa Era Pamibe! 00 RE TE gm = fez 2KCE 55.824 xid 27 Loxoo fo = 875.35 H ifa Lowu 3 db freçuary foto feg=875.35Hz CS Scanned with CamScanner