De Assignment 6
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DIGITAL ELECTRONICS Assignment # 6 BEE – V – A, C • The CMOS SR flip-flop given in Fig. 11.3 of text book is fabricated in a 0.18-μm process for which μ n C ox = 4μ p C ox = 300 μA/V 2 , V tn = │V tp │= 0.5V, and VDD = 1.8 V. The inverters have (W/L) n = 0.27 μm/0.18 μm and(W/L) p = 4(W/L) n The four NMOS transistors in the set–reset circuit have equal (W/L) ratios that is twice the (W/L) ratio of NMOS of inverter. Assume that the total capacitance between each of the Q and ഥ nodes and ground is 20 fF. (a) Determine the time required to discharge the node ത from V DD to V DD /2 using average current method. (b) Find out corresponding t pLH for node Q. (c) What is the status of set and reset pulse during this operation? (d) What is the minimum width required of the set pulse? (i.e. for how long set pulse should be turned on to ensure that both Q and ത nodes have risen/fallen to their V th ) • Solve Exercise 10.11 (Page 993) of the text book • Solve Exercise 11.10 (Page 1038) • Solve End Problem 11.25 of the text book Note: Assignment is to be submitted by group of 2 students. Deadline: 09:40 am – Monday 8 th December, 2014
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Transcript of De Assignment 6
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DIGITAL ELECTRONICS
Assignment # 6
BEE V A, C
The CMOS SR flip-flop given in Fig. 11.3 of text book is fabricated in a 0.18-m process for
which nCox = 4pCox = 300 A/V2, Vtn = Vtp= 0.5V, and VDD = 1.8 V. The inverters have (W/L)n = 0.27 m/0.18 m and(W/L)p = 4(W/L)n The four NMOS transistors in the setreset circuit have equal (W/L) ratios that is twice the (W/L) ratio of NMOS of inverter. Assume that the total capacitance between each of the Q and nodes and ground is 20 fF.
(a) Determine the time required to discharge the node from VDD to VDD/2 using average current method. (b) Find out corresponding tpLH for node Q. (c) What is the status of set and reset pulse during this operation? (d) What is the minimum width required of the set pulse? (i.e. for how long set pulse should be turned on to ensure that both Q and nodes have risen/fallen to their Vth)
Solve Exercise 10.11 (Page 993) of the text book
Solve Exercise 11.10 (Page 1038)
Solve End Problem 11.25 of the text book
Note:
Assignment is to be submitted by group of 2 students.
Deadline: 09:40 am Monday 8th December, 2014
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