Please answer all questions and show all work. Thank you. Refer to Figure L4.5.

Question

Please answer all questions and show all work. Thank you.

Refer to Figure L4.5. Assume that R = 220 k ohm in the circuit. Assuming that VBE = 0.6V. Estimate IB. Further assuming that the DMM measures a collector current of Ic = 2.94mA. estimate beta . Refer to Figure L4.6. Assume that VBE 0.6V. Assuming that the "load does not have too high a resistance, analytically calculate the expected collector current IC. Calculate the analytic estimate for the voltage gain of the common-emitter amp in Figure L4.7. Referring to Figure L4.7, estimate Rin analytically and use it to estimate the low-frequency 3dB point. Note that Rin includes the effects of both the bias resistors and the base impedance. Assume that hfe = 100.

Explanation / Answer

section 4.5

5 -220iB-vbe =0
iB = (5-.6)/2200 = 0.02 mA

ic =2.94 mA

=ic/iB = 147

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