Question

Notify Me Bookmark

(b) Plot the VTC of the CMOS inverter using SPICE. (c) Determine the VTC of the inverter for lambda = 0.05 V-1 and 0.1 V-1. (d) Discuss how the noise margins are influenced by non-zero lambda, value. Note that transistors with very short channel lengths (manufactured with sub-micron design rules) tend to have larger

Consider a CMOS inverter, with the following device parameters: nMOS VT0,n = 0.6 V unCox = 60 uA/V2 pMOS VT0,p = -0.8 V upCox = 20 uA/V2 Also: VDD = 3 V (a) Determine the (W/L) ratios of the nMOS and the PMOS transistor such that the switching threshold is Vth = 1.5 V. (b) Plot the VTC of the CMOS inverter using SPICE. (c) Determine the VTC of the inverter for lambda = 0.05 V-1 and 0.1 V-1. (d) Discuss how the noise margins are influenced by non-zero lambda, value. Note that transistors with very short channel lengths (manufactured with sub-micron design rules) tend to have larger a values than long-channel transistors.

Image text
(b) Plot the VTC of the CMOS inverter using SPICE. (c) Determine the VTC of the inverter for lambda = 0.05 V-1 and 0.1 V-1. (d) Discuss how the noise margins are influenced by non-zero lambda, value. Note that transistors with very short channel lengths (manufactured with sub-micron design rules) tend to have larger

Detailed Answer

1 0

Please enter your email here. You will get email when this question is answered by our tutor.

Answer
Doubtrix Logo

This Problem has been solved!

You'll get a detailed, step-by-step and expert verified solution.

Join Doubtrix with 7-days free trial

  • Icon Correct & Verified Answers
  • Icon No AI-Generated Answers
  • Icon Video Solution for Difficult Questions
  • Icon Work With Experts to Reach at Correct Answers
Login Sign Up
  • Student Reviews:
  • (1)

Similar/Related Questions

Consider a CMOS inverter, with the following device parameters: nMOS VT0,n = 0.6 V unCox = 60 uA/V2 pMOS VT0,p = -0.8 V upCox = 20 uA/V2 Also: VDD = 3 V (a) Determine the (W/L) ratios of the nMOS and the PMOS transistor such that the switching threshold is Vth = 1.5 V. (b) Plot the VTC of the CMOS inverter using SPICE. (c) Determine the VTC of the inverter for lambda = 0.05 V-1 and 0.1 V-1. (d) Discuss how the noise margins are influenced by non-zero lambda, value. Note that transistors with very short channel lengths (manufactured with sub-micron design rules) tend to have larger

Solution
1 0

Consider the CMOS inverter designed in Problem 5.9 above, with λ = 0.1 V-1. Now consider a cascade connection of four identical inverters, as shown below. (a) If the input voltage is Vin = 1.55 V, find Vout1, vout2, vout3 and vout4 (Note that this requires solving KCL equations for each subsequent stage, using the nonzero a value). (b) How many stages are necessary to restore a true logic output level? (c) Verify your result with SPICE simulation.

Solution
0 0

(a) Determine the switching threshold (Vth) of Inverter, 2-input NAND (NAND2), 3input NAND (NAND3), 2-input NOR (NOR2), and 3-input NOR (NOR3). Use the transistor parameters given above. (10 Marks) (b) Now, we want to make Vth of the above gates identical to Vth of Inverter. Determine the new transistor sizes of the above logic gates. (10 Marks) (c) Figure 1 is designed using the above device parameters. Determine VIH, VIL, Vth, and the noise margin of the 2-input NOR gate and the inverter using the equivalent device sizes of the best case. Assume VOH is 90% of VDD and VOL is 10% of VDD. (10 Marks) (d) Explain how to make the noise margins of the above NOR2 balanced for logic ' 0 ' and ' 1 '. (10 Marks) The parameters of the pMOS and nMOS transistors are given below: pMOS Vtp = -0.6 V upCox = 200 uA/V2 (W/L)p = 5 nMOS Vtn = 0.6 V unCox = 500 uA/V2 (W/L)n = 2 VDD = 1.5 V

Solution
7 0