~ Vsig gm2Vπ2 3kΩ gm1Vπ1 + Vπ1 - 2MΩ Rin 2kΩ Rout Vo 1kΩ 4kΩ 4kΩ 100Ω rπ1 rπ2 + Vπ2 - 2k 3kΩ ECE2280 Homework #9 Spring 2009 Use the figure on the right for problems 1-3. Use: ignore ro, |VBE|=0.7, ββββ=100 VI = 20+0.001sin(20t) For DC analysis, assume that the capacitors are open 1. Solve for the DC currents: a. IB b. IE c. IC 2. Solve for the DC voltages: a. VB b. VE c. Vo 3. (a) What region of operation is this transistor acting? (b) Sketch the total instantaneous waveform observed for Ic if the AC amplification is Vo/VI=5V/V. Use the figure below for problems 4 and 5. Use: ignore ro, |VBE|=0.7, ββββ=100 VI = 10+0.002sin(20t) rππππ1=1, 200 gm2=25mA/V, and IB2=6.25µµµµA For the following hybrid-π equivalent circuit below, find the following values: 4. (a) Rin (input resistance –ignore only the input source, Vsig and include all resistors at the base) (b) Rout (output resistance-include all resistors at the collector{no load is connected}) 5. midband gain, VsigVo Vo Rout VI IE VB VE IB IC Vx0≠ + - 10k2k C4100mQ1Q2N3904I11m8V1k90010V6VC3100m1006kΩ 2kΩ 950.8Ω 100Ω 2V 1mA6. For the circuit shown below, drawMake sure that everything is labeled in terms of the transistor number. (e.g. gtransistors. vsig=0.001sin(10t) AC. 7. Use: gm=5mA/V, β=50, ignore r What frequency pole value does C1 create? vsig +15VVo +15V -15V10k500k10C11u 250k500kQ2Q2N3904vsig 10k 1k 9k 70k 0.22uF draw the AC small-signal equivalent circuit(use hybridrything is labeled in terms of the transistor number. (e.g. gm1, vπ2, etc.). ignore ro. create? (express the answer in rad/sec.) +15V -15V 15V C31uQ2N3904signal equivalent circuit(use hybrid-π or model T). , etc.). Include ro for all8. |VBE|=0.7, β=100, ignore ro,, vsig ={2DC operation and short for AC operationthe gain, VsigVo, of the following circuit? If not, explain why. vsig ={2+0.01sin(ωt)}Volts. Assume that the capacitor acts as an open for and short for AC operation. Does this circuit operate as a linear AC amplifier? If so, what is , of the following circuit? If not, explain why. Vo +10.7V Assume that the capacitor acts as an open for AC amplifier? If so, what