Question

Problem 2: BJT Small-Signal Voltage Amplifiers in the lectures, we covered in detail the analysis of an npn BJT amplifier that utilizes a single-supply DC biasing. In this problem, you will meet two additional amplifier architectures- one that is based on dual DC supplies combined with a DC current source, and the other that utilizes a pnp BJT with single-supply biasing. In both problems (below) you need to manually find the amplifier's Q-point (that is, the DC values of Ic and VcE), the BJT small-signal parameters (re, r. gm and ro), drawing of the amplifier's small-signal diagram, the amplifier's input resistancel Rin and the amplifier's voltage gain Av VoVs In the PSPICE/Multisim simulations verify the DC conditions and measure Rin and Av (using both simulation modes Time Domain and AC Sweep). The supply voltages all involve 10V voltages (that is Vec-, VEE 10V). In both problems the signal source resistance is Rsg-10042 and the load resistance is RL- 15ΚΩ. The large capacitors are assumed infinite (for hand-calculations) and in PSPICE take each to be equal to C ImF. In both problems let Rc 3.5K2 2.1. Let I 1mA (and it's beyond the scope of this course to discuss how such DC current sources are implemented using transistor circuits) and let RB 100KS2.

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