# ie_sp07_hw10 - H . Answer 221MHz ECSE-2050 Spring 2007...

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ECSE-2050 Spring 2007 Introduction to Electronics Homework 10 Due Thursday, April 12 th Problem 1 The BJT in the circuit below has β = 200 a) Estimate the lower 3dB frequency for the circuit using the short-circuit time constant. Answer f L =3.22Hz b) Redesign the circuit with new values for the capacitors so that the lower 3dB frequency is 100Hz. Answer C 1 =480nF, C 2 =780nF, C 3 =1.77uF (This answer minimizes the size of the largest capacitor) Problem 2 The BJT in the circuit below has β=100, C μ =0.8pF and f T =600MHz. Assume that the collector is 1mA a. Find the mid-frequency gain, A v =v o /v sig , Answer : 5.2V/V b. Use Short circuit time constants to estimate the lower 3dB frequency f L . Answer 20Hz c. Use the open circuit time constant to estimate the upper 3dB frequency f

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Unformatted text preview: H . Answer 221MHz ECSE-2050 Spring 2007 Introduction to Electronics Problem 3 The BJT in the circuit shown below has =150, C =3.5pF and C = 110.5pF. Assume that the collector current is 5mA and R 1 //R 2 = 2K. Estimate the upper and lower 3dB frequencies. Answers : 378 Hz, 2.2 MHz ECSE-2050 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 small-signal grounds. Answer : Rin=2.49M, A M =-3994, f H =108 KHz....
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## This note was uploaded on 07/05/2008 for the course ECSE 2050 taught by Professor Monahella during the Spring '08 term at Rensselaer Polytechnic Institute.

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ie_sp07_hw10 - H . Answer 221MHz ECSE-2050 Spring 2007...

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