Question

3. Find Ic and Vce in the circuits below. Assume Bde 200, VBE 0.6V Sat'n Show all calculations and explain your thinking. 5レ a) b) c) SK 10K . 3M 5ok Ik 4. a) Design a common emitter amplifier so that Ic using a 2N3947 over its whole temperature range. Show a schematic diagram of your circuit and label the values of all resistors. Show your calculations. Find Rin Ro, and Av for mid-band frequencies. Assume Xe's are negligible and use ical values for Bo at 25 C, and let Vcc 12V = 1 mA ±20% and VCE-4V ±25% b) How much docs Av change as the temperature varies from-55 to 175 degrees C.

Answer 1

- iov 3 a Since negative voltage 0 is applied at base The 3H in cut off transistor is 0.0o 05 V

since base ciicuit is open ciscuited, Hence transistor is of f ti-5 V 아.5 +0.5 4

0.088 MA soK C.-ATB-200 (0.088 MP (6 011) 11.6 mA Here the tronsi stor is not in active veaion こ-13.6V

, the tansistor Since VC s negativ opesatinsatufation Hence, V C. io k