ECE Problem Set: Bipolar Transistor and MOSFET Biasing, Assignments of Political Science

Download ECE Problem Set: Bipolar Transistor and MOSFET Biasing and more Assignments Political Science in PDF only on Docsity! 1 ECE137A Problem set #1 Problem 1. bipolar transistor biasing. Assume a Vbe(on) of 0.7 volts. Vcc RcIb Vc a) beta=100 Vcc=10 Volts. What base current is required for Ic=1 mA ? If Ic=1 mA, what Rc is required for Vc=5 Volts ? (this biasing circuit not recommended) RcRb Vcc b) beta=100 Vcc=10 volts We want 200 microamps collector current, and Vce=5 Volts Find Rc and Rb (this biasing circuit not recommended) RcRb Vcc c) Bias stability of the circuit of problem 1(b). First, keeping the same values for Rb and Rc you found above, compute the collector current and the collector voltage if beta is increased to 200. Second, keeping the same values for Rb and Rc you found above, compute collector current and the collector voltage if beta is returned back to 100 but Vcc is increased 10%. Caution: You must consider the possibility of saturation. 2 RcRb1 Vcc Rb2 Ree Vc Ve d) beta=100 Vcc =10 Volts You are to work to the following conditions. Collector voltage Vc= 4 Volts Emitter voltage Ve=2 volts current in Rb2=200 microamps collector current = 2 mA Find Rb1, Rb2, Ree, Rc RcRb1 Vcc Rb2 Ree Vc Ve e) Bias stability of the circuit of problem 1(d). First, keeping the same values for Rb1, Rb2, Ree and Rc you found above, compute the collector current and the collector voltage if beta is increased to 200. Second, keeping the same values for Rb1, Rb2, Ree and Rc you found above, compute the collector current and the collector voltage if beta is returned back to 100 but Vcc is increased 10%. Caution: You must consider the possibility of saturation. RcRb1 Vee Rb2 Ree Vc Ve d) beta is 300 Vee=10 Volts You are to work to the following conditions collector voltage Vc=1 volts emitter voltage is 2 volts 2 mA collector current 200 microamps current in Rb2. Find Rb1, Rb2, Ree, Rc