Microelectronic Circuit Design Fourth Edition - Part II Solutions to Exercises
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- Ἀλκμήνη Βενιζέλος
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1 Page 9 Microelectronic Circuit Design Fourth Edition - Part II olutions to Exercises CHAPTER 6 NM 0.8V 0.4V 0.4 V NM H 3.6V.0V.6 V Page 94 V 0% V + 0. ΔV [ ].4 V [ ].4 V.6V (.6) 0.6V (.6) Checking : V 0% V H 0.9 ΔV V 90% V H 0. ΔV [ ] 0.8 V [ ] 0.8 V 0.6V (.6).6V (.6) Checking : V 90% V ΔV V 50% V H + V V t r t 4 t 3 3 ns t f t t 5 ns Page 95 At P mw : PDP mw ns At P 3 mw : PDP 3mW ns At P 0 mw : PDP 0mW ns pj 3 pj 40 pj Page 97 Z ( A + B) ( B + C) AB + AC + BB + BC AB + BB + AC + BB + BC Z AB + B + AC + B + BC B( A +) + AC + B( C +) B + AC + B Z B + B + AC B + AC 08//0
2 Page 300 I DD P 0.4mW V DD.5V 60 µa R V V DD.5V 0.V I DD 60µA A W.6x0 4 A 0 4 V V W kω Page 30 I DD V V DD 3.3V 0.V R 0kΩ 3.4µA 3.4x0 6 A 6x0 5 A W V 0. V W.09 Page 303 R 0.5V on R on + 8.8kΩ.5V R on.84 kω W W (.84kΩ) kΩ R on.03 6x kω V 3.3V 0.0 V 6.6kΩ +0kΩ V K n R A Page 305 K n R 6x0 5 Ω V V V.03 NM H x V ( 6.30) V NM V 08//0
3 Page 309 Using MATAB : fzero(@(vh) ((vh * sqrt(0.6))^ - 0.5(vh + 0.6)), ) ans.5535 fzero(@(vh) ((vh * sqrt(0.6))^ - 0.5(vh + 0.6)), 4) ans 3.70 [ ] V 3.6 V H V H V H fzero(@(vh) ( * (sqrt(vh + 0.6) - sqrt(0.6)) - vh), ) ans 3.6 ( a) 80x0 6 A 00x0 6 A V W V V TN V W 80x0 6 A 00x0 6 A W ( ) V W V (b) 80x0 6 A 00x0 6 A W V 0. V W 0.63 V V TN x0 6 A 00x0 6 A W V ( ) V W Page 3 The high logic level is unchanged : V H. 60x0 6 A 50x0 6 A W V 0. V W V TN x0 6 A 50x V A V W ( ) V W //0
4 Page 34 Using MATAB : fzero(@(vh) ((vh * sqrt(0.6))^ - 0.5(vh + 0.6)), ) ans.5535 γ 0 V TN 0.6V V H V I DD 0 for v O V H 0 00x V V 00x0 6 (.5 V 0.6) 0 6V 6.8V V 0.35V I DD 00x µa Checking : I DD 00x0 6 ( ) 77 µa Page 39.44V V TN W 60.6x0 6 00x W 60.6x0 6 00x0 6 W ( 0.44) W Page 30 I D 00x µa which checks. Page 3 The PMO transistor is still saturated so I D 44 µa, and V H.5 V. 5 44x0 6 00x V V V 0.58 V Page 36 Place a third transistor with W. in parallel with transistors A and B. The W/ ratio of the load transistor remains unchanged : W //0
5 Page 37 Place a third transistor in series with transistors A and B. The new W/ ratios of transistors A, B and C are W ABC The W/ ratio of the load transistor remains unchanged : W Page 333 M is saturated for all three voltages. I DD 40x0 6. The voltages can be estimated using the on - resistance method. 3mV 64.4mV For the 000 case, R ona 80.µA For the 000 case, R one 64.4mV 80.µA For the 00 case, R onc 804 Ω. 03mV 3mV 80.µA [.5 ( 0.6) ] 80. µa 844 Ω R onb 64.4mV 80.µA 804 Ω 3mV 64.4mV 886 Ω R ond 80.µA 844 Ω The voltage across a given conducting device is I D R on. mall variations in R on are ignored. ABCDE Y (mv) (mv) 3 (mv) I DD (ua) ABCDE Y (mv) (mv) 3 (mv) I DD (ua) V V.5 V V V.5 V V V.5 V.5 V V V 0.5 V V.5 V.5 V V.5 V.5 V V.5 V.5 V V V V V V 0.5 V //0
6 Page 334.5V 80µA P av Page 335 P D 0 - F.5V 0.00 mw x0 4 W 00 µw or 0.00 mw x0 4 W 0.0 W or 0 mw 3x0 6 Hz P D 0 - F(.5V ) 3.x0 9 Hz Page 336 The inverter in Fig. 6.38(a) was designed for a power dissipation of 0. mw. To reduce the power by a factor of two, we must reduce the W/ ratios by a factor of. W W mW To increase the power by a factor of, we must increase the W/ ratios by a factor of 0. 0.mW W W To reduce the power by a factor of three, we must reduce the W/ ratios by a factor of 3. W W W A BCD 6 08//0
7 Page 339 t r.rc. 8.8x0 3 Ω ( x0 3 F).7 ns ( x0 3 F) 3.97 ns τ PH 0.69RC x0 3 Ω v O ( t) V F ( V F V I )exp t v O ( τ PH ) V H 0.5 V + V H V RC ( 0..5)exp τ PH τ PH RC ln RC RC v O ( t ) V H 0. V H + V V.7 0. ( 0..5)exp t t RC ln 0.9 RC v O ( t ) V + 0. V H + V V ( 0..5)exp t t RC ln 0. RC t f t t RC ln 0.+ RC ln0.9 RC ln 9.RC Page x0 3 Ω t f (.5x0 3 F).9 ns τ PH.(.37x0 3 Ω) (.5x0 3 F) 0.7 ns (.5x0 3 F) 5.8 ns τ PH 0.69( 8.8x0 3 Ω) (.5x0 3 F) 4.97 ns t r. 8.8x0 3 Ω τ P Page ns ns T Nτ P ns 80 ns f T 0 9 s.5 MHz 80ns 7 08//0
8 Page 347 For our Psuedo NMO inverter with V 0. V, C " τ PH.R on C. ox W " W µ n C ox ( V V G TN ). µ n V G V TN ( 50x0 9 m) ( 00cm m) τ PH ps 500cm V s V τ PH.R on C. 0.4µ p V G V TN τ P Page ps +.63ps 00cm m ( 5cm V s) x0 9 m.6 ps The PMO transistor is saturated for v O V. P av I DD 40x0 6.5V (.7mA).4 mw P D 5x0 F.5V 0.V We must increase the power by a factor of 0 pf 5pF V.63ps 3.7 ns 8, ns [.5 ( 0.6) ].7 ma 3. mw x0 9 s so the W/ ratios must also be increased by a factor of 8. W W P D 0x0 F.5V 0.V 06 mw 0 9 s 8 08//0
9 CHAPTER 7 Page 370 ( a) K p 40x µa V K 0 n 00x µa ma.00 V V.09 V.3 V ( b) V TN ( c) V TP Page 37 a For v I V, V GN V TN V and V GP V TP V M N is saturated for v O 0.4 V. M P is in the triode region for v O.6 V..6 V v O.5 V ( b) M P is saturated for v O.6 V. 0.4 V v O.6 V ( c) M N is in the triode region for v O 0.4 V. M P is saturated for v O.6 V. 0 v O 0.4 V W P K n W K p N Page 373 Both transistors are saturated since V G V D. K n ( V V GN TN ) K p ( V V GP TP ) K n K p V TN V TP V GN V GP v I V DD v I v I V DD 0K p ( V GN V TN ) K p ( V V GP TP ) 0( V GN V TN ) V GP + V TP 4 v I 0.6 v I.73 V 0 v I 0.6 K p ( V V GN TN ) 0K p ( V GP V TP ) ( V GN V TN ) 0( V GP + V TP ) v I 0.6 0( 4 v I 0.6) v I.37 V 9 08//0
10 Page 375 W K n K R W K p N P K n K p.5 ( V K V + V DD R TN TP ) + 3K R K R ( ) (.5 ) + 3(.5) V IH K V V + V R DD TN TP K R V IH.5 (.5.5( 0.6) 0.6).V.5 ( V O K + R )V IH V DD K R V TN V TP (.5+ ) K R.5 V I K V R ( V + V DD TN TP ) K R K R + 3 (.5 ) V I ( V K V + V DD R TN TP ) K R (.5.5( 0.6) 0.6) 0.90V V ( V OH K + R )V I + V DD K R V TN V TP (.5+ ) ( 0.6) V NM H V OH V IH V NM V I V O V Page F ymmetrical Inverter : τ P.R onn C Ω 3.6 ns Page 377 ymmetrical Inverter : R onn τ P.C 0 9 s. 5x0 F W N ' R onn K n ( V G V TN ) Ω 3.5 W P.5 W N //0
11 Page 379 The inverters need to be increased in size by a factor of 80ps 50ps.. W W N W N Page 380.4C τ PH.4R onn C K n V G V TN.4C τ PH.4R onp C K p V G V TN.4C τ PH.4R onn C K n V G V TN.4C τ PH.4R onp C K p V G V TN P W.4C K n (.5 0.6).6 C K n.4c K p (.5 0.6).6 C K p.4c K n ( ) 0.94 C K n P C K p ( ) 0.94 C K p Page 38 The inverter in Fig. 7. is a symmetrical design, so the maximum current occurs for v O v I V DD. Both transistors are saturated : i 0-4 DN Checking : i DP 4x0-5 5 (.5 0.6) 4.3 µa Page 38 ( a) PDP CV DD 5 ( b) PDP CV DD 0 3 F 3.3V F(.5V ) 0.3 pj 30 fj 5 ( c) PDP CV DD 0 3 F.8V pj 0 fj pj 65 fj 4.3 µa 08//0
12 Page 388 Remove the NMO and PMO transistors connected to input E, and ground the source of the NMO transistor connected to input D. The are now 4 NMO transistors in series, and W 4 8 W 5 N P Page 39 There are two NMO transistors in series in the AB and CD NMO paths, and three PMO transistors in the ACE and BDE PMO paths. Therefore : W 4 W W N ABCD N E Page 396 (a) The logic network for F AB + C is P C B A P CV DD f ( 50x0 F) ( 5V ) ( 0 7 Hz).5 mw 08//0
13 Page pf β 3.6 τ P 3.6τ o + 3.6τ o 63.τ o 50 ff z e ln z ln z z e ln z ln z e 50 pf 7 β ff,.68, , , , , A o 46 A o A o 594 A o A A Page 40 From the figure, 0/ devices give a maximum R on of 4 kω. The W/ ratios must be 4 times larger in order to reduce the maximum R on to kω. W //0
14 Page 49 CHAPTER 8 ( a) N segments ( b) N segments Page 4 a N ,435,456 ( b) I DD 0.05W 3.3V 5. ma Current/cell 5.mA 8 cells 56.4 pa Reverse the direction of the substrate arrows, and connect the substrates of the PMO transistors to V DD. Page 46 M A : At t 0 +, V G V TN 4 V and V D.5V, so transistor M A is operating in the triode region. i 60x µa M A : At t 0 +, V G V D, so transistor M A is operating in the saturation region. V TN + 0.6( ).59V i 60x µa Page 48 M A : At t 0 +, V G V D, so transistor M A is operating in the saturation region. i 60x µa M A : At t 0 +, V G V D, so transistor M A is operating in the saturation region. i 60x0 6 ( 5 ) 480 µa 4 08//0
15 Page 43 a At t 0 +, V G V TN V and V D.9 V, so transistor M A is operating in the triode region. i 60x µa 50x0 ( b) 5 F From Table 6.0 : t f 3.7R on C x V C V B V TN V C V C n CV q 5x0 5 F.89V.60x0 9 C Page 43 ( a) ΔV V V C B C B + C C C C C C +.34 ns [ ] V.89 V V C C.95 x 0 5 electrons V 9.0 mv ΔV V C V B C B C C V V 9.0 mv 49C C + C C C ( b) τ R C 5 ff on 5kΩ 0.3 ns or τ R C C on C C 5kΩ( 5 ff) 0.5 ns + C B 49 + Page 434 At t 0 +, V G V TN V and V D.5 V, so transistor M A is operating in the triode region. i D 60x µa 5 08//0
16 Page 436 In setting the drain currents equal, we see that the change in W/ cancels out, and the voltages remain the same. i D 5 60x µa P D ( 59.5µA) ( 3V ) mw As a check, the current should scale with W/ : i D 5 ( 3.5µA ) 58.8 µa Equating drain currents: 5x0-6.5 V O 0.6.4V O + 0.9V O V O.V i D 5x Checking : 60x Page 488 R on 60x0-6 V O µa P D ( 5.6µA) (.5V ) 78.0 µw 5.6 µa 3.8 kω τ 3.8kΩ( 5 ff) ns 60x0 6 ( 3.3 ) Page 440 For all possible input combinations there will be two inverters and 3 output lines in the low state..0 mw P D 5 0.mW Page 44 W //0
17 Page 444 For a 0 - V input, all transistors will be on and the input nodes will all discharge to 0 V. For the 3- V input, the nodes will all charge to 3 V as long as V TN V. γ.58 V TN γ V. Thus the nodes will all be a 3 V. The output will drop below V DD /. For the PMO device, V G V TP The PMO transistor will be saturated. For the NMO device, V G V TP Assume linear region operation. 40x x0-6 V O.4V O V O 68.6 mv V O V O V V. 7 08//0
18 Page 46 i C exp 0.V.98 x 0 3 i C 0.05V CHAPTER 9 i C exp 0.3V.63 x 0 5 i C 0.05V i C exp 0.4V 8.89 x 0 6 i C 0.05V Page 464 The current must be reduced by 5 while the voltages remain the same. I EE 300µA 5 Page 465 I B I E β F + I B3 R C 4.4µA kω 60 µa R C 5( kω) 0 kω I B3 9.9µA 4.4 µa I B 4 07µA 5.0 µa 8.84 mv << 0.7 V I B 4 R C 5.0µA( kω) 0. mv << 0.7 V Page 467 V H V V 0 0.mA kω 0.7V +.0V V REF 0.7V. V 0.9 V ΔV -0.7V - (.V ) 0.4 V Page 469 NM H NM 0.4V V + ln V 8 08//0
19 Page 47 P 3.3V 0.3mA + 0.mA.65 mw P 3.3V 0.357mA + 0.mA.84 mw NM H NM 0.6V V + ln V From the graph, the VTC slope is - for V I.08 V, V OH 0.7 V and V IH 0.9 V, V O.8 V. NM H V. NM.08 (.8) 0.0 V The voltages remain the same. Thus the currents must be reduced by a factor of 3, and the resistor values must be increase by a factor of R EE Page 47.7V ( 5.V ) 7.5 kω I E 0.0mA For all inputs low : I EE ΔV V H V REF For an inputs high : I EE 0.7 ( 5.).7.4V ( 5.V ) 0. ma R C 0.4V.90 kω 8 kω 0.mA V kω 99µA 0.7 ( ) 0.3 V ΔV 0.6 V R C 0.6V.00 kω 99µA ( 5.).7 Based upon analysis above, R C 0.6V.85 kω 35µA Page 473 For all inputs low : I EE ΔV V H V REF Page 474 R E V V E EE 0.3mA 0.7 ( 5.).7 V kω 35µA R 0.6V C.85 kω 35µA V kω 99µA 0.7 ( ) 0.3 V ΔV 0.6 V R C 0.6V.00 kω 99µA ( 5.V ) 0.3 V 5.0 kω ma 9 08//0
20 Page 475 ( a) For I E 0, v O 5. V. b For I E 0, v O - 5.V Page 476 The transistor's power dissipation is P V CB I C + V BE I E 5V.55mA V.55mA 5 The total power dissipation in the circuit is P V CC I C + V EE I E 5V.55mA V.55mA mw 5.3 mw For v O 3.7V, I E µa ( 5) At the Q - point, I E ma The transistor's power dissipation is P V CB I C + V BE I E 5V 3.7mA V 3.7mA ( a) 4V 5.V ( b) I E 5.V 3kΩ.73 ma I E 0kΩ 0kΩ + R E R E 3.00 kω 4 ( 5. ) 3000 Page 478 Increase the value of each resistor by a factor of mw 0kΩ 0kΩ +5kΩ.08 V I 4 5. E 3000 Page 48 R C ΔV 0.6V I EE 0.5mA. kω τ P 0.69(.kΩ) ( pf).66 ns P 5.V ( )mA 3.64 mw PDP 6.0 pj ma //0
21 Page 483 R C R C 0 V 0.4V I EE 0.5mA 800 Ω P I V EE EE 0.5mA.8V PDP.4mW 50 ps 70 fj I EF I EE 50 µa P I V EE EE 0.5mA(.8V ) 0.70 mw.40 mw V H 0 V 0. V V Bias 0. V V BH 0.7 V B 0.9 V V BiasB 0.8 V V AH.4 V A.6 V V BiasA.5 V V EE V AH 0.7V 0.7V V V EE.8 V V H 0 V, V 0.4 V, : The C - level bias is V BiasC V + V H Using the level shifter in Fig. 9.7, V BH 0.7 V B. V V BiasB 0.9 V V AH.4 V A.8 V V BiasA.6 V V EE V emittera 0.7V V V EE.8 V 0. V Page 488 For v O V H, I C 0, and P 0. P V DD I DD 5V.43mA Increase R by a factor of 0 : R 0 kω Page Γ exp 48. I B 0 A α R Page 49 I B 0A 0 + 0kΩ ma.59 A 3.34 A β FOR 0 A 3.34 A //0
22 Γ exp I B 0 A A V T.38x mv V.60x0 9 CEMIN 36.5mV ln mv 0.05 Γ exp α R I B 0mA 0.5( 54.6) ma β FOR 0mA.08mA //0
23 Page 494 ns 6.4ns ln ma I BR.5mA 40.7 I BR.69 i CMAX V CC V CE β F mA Q X Q F i F τ F.5mA 0.5ns 0.65 pc Q X >> Q F ma I BR 0.064mA I BR I BR 5.49 ma.5ma 6.4ns ma 6.0 pc 40.7 Page For v I V 0.5 V : i I ma V V + V BE CEAT Using the value of V CEAT in Fig. 9.3, V BE V A better estimate is V CEAT 5mV ln + 0. mv V BE V Page 496 For v I V H 5 V : i IH ma V 0.8 V BE 0.875mA + (.4mA) 3 Using Eq. (5.9), V BEAT 0.05V ln 0 5 A V 3 Page 499 5V - N (kω)β R I B.5V I B mA 3.5V β R 5(kΩ) 0.875mA 0(kΩ) 0.875mA Page I B β 3.5V R ma.43ma + N (.0mA) 8.3(.63mA) N //0
24 Page 50 v I V and v O 0 : I B 4 5 V B I I 5.4 ma 5 ( ) I B ma I 4I B ma 600 V CE 5 30ΩI C V O 5V 30Ω 5.4mA 5 ( ).5 ma I 4I B ma V Oops! - the transistor is not in the forward - active region. Assume saturation with V CEAT 0.5V I I B + I C ma Page 53 a BiCMO NAND gate : Replace the CMO NOR - gate with a two - input CMO NAND - gate, and connect its output to the bases of Q 3 and Q 4. ( b) BiNMO NAND gate : Replace the input CMO NOR - gate with a two - input CMO NAND - gate, and connect M 6 and M 7 in series instead of parallel. 4 08//0
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