7-2 Early voltage for the process technology is spec- ified as 10 V/μm. [20 minutes] 7.4 [17 points] VDD-45 V (1) For Rsig=1 M and R = 40 k2, find the [5 points] value of the overall voltage gain/sig (g) What does the voltage gain become if Cg is [2 points] removed? Ro -Vss Figure 7.4.1 The MOSFET in the circuit of Fig. 7.4.1 has HnCax(W/L) 4 mA/V² [2 points] (a) Find the value of I that causes the MOSFET to operate in saturation with an overdrive voltage of 0.25 V. [2 points] (b) What value of Rp results in Vp=0V? [2 points] (c) Find the value of gm- [2 points] (d) Find the value of ro given that V = 25 V. [2 points] (c) If Rin is to be 1 MQ, find the value that RG must have. 7.5 [35 minutes] Figure 7.5.1 (refer to Figure below) shows a [28 points] capacitively coupled amplifier. In the following, assume operation at midband frequencies where the coupling and bypass capacitors behave as short circuits. The BJT has ẞ=99 and the Early effect can be neglected. (a) If the de voltage at the base is to be 5V and [2 points] the emitter current 1 mA, find the required value of (REI +RE2). Assume VBE = 0.7 V. (b) If the input resistance at the base, Rib, is to be [5 points] 10 k2, find the required value of REI and hence the value of RE2 (c) If the de current in Rg2 is to be 0.1 mA, find [3 points] the values of RB1 and R2-1 (d) Find the value of Rc that results in a de voltage [3 points] of +6 V at the collector. (e) Find the input resistance Rin and the value of [4 points] /sig (f) Find the value of /up [4 points] (g) Find the value of the overall voltage gain [2 points] /sig (b) If the peak amplitude of the signal between [5 points] base and emitter (x) is to be limited to 5 mV, what are the corresponding amplitudes of y, sig and ? R-10 kn A Ra Rip +15 V Rg2 ww Re ww Rgy RE Rib RL -0% 10 kn CE H

Fig: 1