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Unformatted text preview: H . Answer 221MHz ECSE2050 Spring 2007 Introduction to Electronics Problem 3 The BJT in the circuit shown below has β=150, C μ =3.5pF and C π = 110.5pF. Assume that the collector current is 5mA and R 1 //R 2 = 2KΩ. Estimate the upper and lower 3dB frequencies. Answers : 378 Hz, 2.2 MHz ECSE2050 Spring 2007 Introduction to Electronics Problem 4 Problem 6.122, (a) and (b). Hints; The parameter C je is not used in the solution. Also, if you use the formula sheet for the amplifier configurations, you will need to include the effect of r o . Finally, the arrows point to voltage supplies which are smallsignal grounds. Answer : Rin=2.49MΩ, A M =3994, f H =108 KHz....
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 Spring '08
 MonaHella
 Hertz, lower 3dB frequency

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