# 41 repeat problem 40 for the circuit shown in fig 963

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41. Repeat Problem 40 for the circuit shown in Fig. 9.63, but assuming that is twice its nominal value. 42. We wish to generate two currents equal to 50 A and 230 A from a reference of 130 A. Design an npn current mirror for this purpose. Neglect the base curents. 43. Repeat Example 9.15 if the reference current is equal to 180 A. 44. Due to a manufacturing error, resistor has appeared in series with the base of in Fig. 9.64. If is 10% greater than its nominal value, express the value of in terms of other circuit parameters. Assume and are identical.

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BR Wiley/Razavi/ Fundamentals of Microelectronics [Razavi.cls v. 2006] June 30, 2007 at 13:42 458 (1) 458 Chap. 9 Cascode Stages and Current Mirrors Q I V CC REF REF Q 1 I R P 1 Figure 9.63 Q I V CC REF REF Q 1 I R P 1 Figure 9.64 Q I V CC REF REF Q 1 I R P 1 Figure 9.65 45. Repeat Problem 44 for the circuit shown in Fig. 9.65, but assuming is 10% less than its nominal value. 46. Taking base currents into account, determine the value of in each circuit depicted in Fig. 9.66. Normalize the error to the nominal value of . Q I V CC REF REF Q 1 I A E A E 5 copy Q I V CC REF REF Q 1 I A E A E 5 copy Q I V CC REF REF Q 1 I Q I 2 2 copy A E 2 A E 3 A E 5 (c) (a) (b) Figure 9.66 47. Calculate the error in for the circuits shown in Fig. 9.67. 48. Taking base currents into account, compute the error in for each of the circuits illus- trated in Fig. 9.68. 49. Determine the value of in the circuit of Fig. 9.69 such that . With this choice of , does change if the threshold voltage of both transistors increases by ? 50. Determine the value of in the circuit of Fig. 9.70 such that . With this choice of , does change if the threshold voltage of both transistors increases by ?
BR Wiley/Razavi/ Fundamentals of Microelectronics [Razavi.cls v. 2006] June 30, 2007 at 13:42 459 (1) Sec. 9.3 Chapter Summary 459 Q I V CC REF REF Q 1 I A E n A E Q I A E copy1 2 2 k m Figure 9.67 V CC I REF I copy A E A E A E A E V CC I REF I copy A E 3 A E 2 A E 5 A E 9 (a) (b) Figure 9.68 I V REF I M REF M 1 DD R P 1 W L W L Figure 9.69 I V REF I M REF M 1 DD 1 W L W L R P Figure 9.70 51. Repeat Example 9.21 if the reference current is 0.35 mA. 52. Calculate in each of the circuits shown in Fig. 9.71. Assume all of the transistors operate in saturation. 53. Consider the MOS current mirror shown in Fig. 9.35(c) and assume and are identical but . (a) How should be chosen so that is exactly equal to ?

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BR Wiley/Razavi/ Fundamentals of Microelectronics [Razavi.cls v. 2006] June 30, 2007 at 13:42 460 (1) 460 Chap. 9 Cascode Stages and Current Mirrors I REF M REF I copy V DD W L ( ( n W L ( ( n W L ( ( 3 2 5 W L ( ( 3 p p I REF M REF V DD W L ( ( n W L ( ( n W L ( ( W L ( ( p p W L ( ( n I copy 5 3 2 (a) (b) Figure 9.71 (b) Determine the error in with respect to if is equal to (so that resides at the edge of saturation). Design Problems In the following problems, unless otherwise stated, assume A, V, A/V , A/V , V, and V, where the subscripts and refer to -type ( npn or NMOS) and -type ( pnp or PMOS) devices, respectively.
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