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ece137a_ps1_2008

# ece137a_ps1_2008 - ECE137A Problem set#1 Problem 1 bipolar...

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1 ECE137A Problem set #1 Problem 1 . bipolar transistor biasing. Assume a Vbe(on) of 0.7 volts. Vcc Rc Ib 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) Rc Rb 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) Rc Rb 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.

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2 Rc Rb1 Vcc Rb2 Ree Vc Ve d) beta=100 Vcc =10 Volts You are to work to the following conditions. Collector voltage Vc= 4 Volts
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ece137a_ps1_2008 - ECE137A Problem set#1 Problem 1 bipolar...

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