Question

(i) What the meat by saturation level? Write the procedure for measuring the saturation level of an emitter biased BJT amplifier circuit by drawing its circuit diagram and operational characteristics curve. (5 Marks) (ii) Determine the saturation current (cat) for the network shown in the following figure. (2 Marks) 20 V 470 22 270 k92 tice ovc VCEO B= 125 180 2.2 kg

Answer 1

transfer characteristice realeration q UBE3JUBELS VBEN active region VC VRE ii) det us find if given transistor is in catrom 20 200 ß2125 270k 3 СТОП ove IB VE 0 2oak Applying KVL in 20 - 270k IB - 007 - 2.2k (BH) 18 20 1963 - (270k + 120 x 2-2k7 18 IB 2 1903 35.27 MA 547.2k Jcz ßXIB = 125x 35.27 MA 4.408 mA Vc a 20 - U. 168 X O. 470 VB - 20-atok X 35.27 MA 9.58 17.90 NCS VR : transistor is in active region,

for saturation Ice is fixed VCE = 0.2v Applying KUL باهم uto 20 - 470xIc - 0.2-2.2kIe=0 0.2 IE SI 2.2k 20-0.2, (0.47k4a. k )I. Ic , 19.8 2 Toulma 2 2.676