fe - 2 Problems 1) - 8) concern the amplifier shown below....

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Unformatted text preview: 2 Problems 1) - 8) concern the amplifier shown below. Note that the load consists of an 8K resistor in parallel with a 10 pF capacitor. Assume that the transistor is described by I D = 1.5(V GS- 2) 2 mA and Cgs = 8 pF and Cgd = 3 pF. 8 K 8 K V s 25 V R SS 200K 200K 100K 10 pF 5 F 1 F 25 F Figure 1 1) The value of R SS that will bias the MOSFET at I D = 1.5 mA is: (a) 0.5 K (b) 1.3 K (c) 2.7K (d) 3.4 K (e) 6.3 K--------------------------------------------------------------------------------------------------------------------- 2) Assuming that the MOSFET is biased at I D = 1.5 mA, the mid-frequency gain, v out /v s , of the amplifier is: (a) -6 (b) +6 (c) -12 (d) +12 (e) -24--------------------------------------------------------------------------------------------------------------------- 3) The Thevenin equivalent resistance seen by the 1 F capacitor in Fig. 1 is: (a) 50 K (b) 100 K (c) 200 K (d) 300 K (e) 500 K 3 4) The capacitor most likely to control the low-frequency response of the amplifier in Fig. 1 is (a) the 1 F capacitor (b) the 5 F capacitor ( c) the 25 F capacitor (d) the 10 pF capacitor (e) C gs , the 8 pF capacitor inside the MOSFET--------------------------------------------------------------------------------------------------------------------- 5) The value of the Miller capacitance for the amplifier in Fig. 1 is (a) 75 F (b) 3 pF (c) 10 pF (d) 24 pF (e) 39 pF--------------------------------------------------------------------------------------------------------------------- 6) If the value of R SS is reduced , which parameter(s) of the Fig. 1 amplifier change? (a) the input resistance (b) the output resistance (c) the mid-frequency gain (d) all of the above (e) none of the above--------------------------------------------------------------------------------------------------------------------- 7) If it is desired to attach a 100 load instead of the 8K load shown in Fig. 1 and maintain about the same gain of the amplifier at the same value, then what type of amplifier stage should be inserted between this one and the load? (a) CE (b) CB (c) CG (d) CD (e) another CS 4 8) What is the proper expression for the Thevenin equivalent resistance seen by the 10 pF load capacitor in Fig. 1? (a) R Th = 8 K (b) R Th = 8 K + 8 K (c) R Th = 8 K ||8 K (d) R Th = 8 K || 8 K + 1 g m (e) R Th = 8 K || 8 K ||1 g m Problems 9) and 10) concern the RC circuit shown below. V s 1K 1K 1 F 1 pF V out +- Figure 2--------------------------------------------------------------------------------------------------------------------- 9) The low-frequency corner frequency for this circuit is about: (a) 500 radians/s (b) 1000 radians/s (c) 5 x 10 8 radians/s (d) 10 9 radians/s...
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This note was uploaded on 02/13/2012 for the course ECE 255 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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fe - 2 Problems 1) - 8) concern the amplifier shown below....

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