**8.48 The MOSFETs in the circuit of Fig. P8.48 are matched, having kn(W/L)1 = kp(W/L)2 = 1 mA/V2 and  Vt  = 0.5 V. The resistance R = 1M. (a) For G and D open, what are the drain currents ID1 and ID2? (b) For ro = ∞, what is the voltage gain of the amplifier from G to D? (Hint: Replace the transistors with their small-signal models.) (c) For finite ro( VA  = 20 V), what is the voltage gain from G to D and the input resistance at G? (d) If G is driven (through a large coupling capacitor) from a source v sig having a resistance of 20 k, find the voltage gain vd/vsig. (e) For what range of output signals do Q1 and Q2 remain in the saturation region?

8.48 - **8.48 The MOSFETs in the circuit of Fig. P8.48 are matched, having kn(W/L)1 = kp(W/L)2 = 1 mA/V2 and  Vt  = 0.5 V. The resistance R = 1M. (a) For G and D open, what are the drain currents ID1 and ID2? (b) For ro = ∞, what is the voltage gain of the amplifier from G to D? (Hint: Replace the transistors with their small-signal models.) (c) For finite ro( VA  = 20 V), what is the voltage gain from G to D and the input resistance at G? (d) If G is driven (through a large coupling capacitor) from a source v sig having a resistance of 20 k, find the voltage gain vd/vsig. (e) For what range of output signals do Q1 and Q2 remain in the saturation region?

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images - **8.48 The MOSFETs in the circuit of Fig. P8.48 are matched, having kn(W/L)1 = kp(W/L)2 = 1 mA/V2 and  Vt  = 0.5 V. The resistance R = 1M. (a) For G and D open, what are the drain currents ID1 and ID2? (b) For ro = ∞, what is the voltage gain of the amplifier from G to D? (Hint: Replace the transistors with their small-signal models.) (c) For finite ro( VA  = 20 V), what is the voltage gain from G to D and the input resistance at G? (d) If G is driven (through a large coupling capacitor) from a source v sig having a resistance of 20 k, find the voltage gain vd/vsig. (e) For what range of output signals do Q1 and Q2 remain in the saturation region?

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