Question

Notify Me Bookmark

Consider an NMOS, as shown in Fig. 2, VDD = 3 V, Vtno = 0.6 V, μnCoxW/L = 40 μA/V2, γn = 0.5 V1/2 , ϕf = 0.3 V, and λn = 0.015 1/V. The initial value of V2 is 0 V, i.e., V2(t = 0) = 0 V. Find V2(t >> 0) in the following cases under DCSS condition: (a) V1 = 1 V (b) V1 = 3 V

Consider an NMOS, as shown in Fig. 2, VDD = 3 V, Vtno = 0.6 V, μnCoxW/L = 40 μA/V2, γn = 0.5 V1/2 , ϕf = 0.3 V, and λn = 0.015 1/V. The initial value of V2 is 0 V, i.e., V2(t = 0) = 0 V. Find V2(t >> 0) in the following cases under DCSS condition: (a) V1 = 1 V (b) V1 = 3 V

Image text
Consider an NMOS, as shown in Fig. 2, VDD = 3 V, Vtno = 0.6 V, μnCoxW/L = 40 μA/V2, γn = 0.5 V1/2 , ϕf = 0.3 V, and λn = 0.015 1/V. The initial value of V2 is 0 V, i.e., V2(t = 0) = 0 V. Find V2(t >> 0) in the following cases under DCSS condition: (a) V1 = 1 V (b) V1 = 3 V

Detailed Answer

2 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:
  • (2)
  • Correct answers (2)
  • Complete solution (2)
  • Step-by-step solution (2)
  • Fully explained (2)

Similar/Related Questions

The technological parameters are μnCox = 4μpCox = 40 μA/V2, ∣γ∣ = 0.5 V1/2, 2ϕf = 0.5 V, λ = 0.02 V−1, Vtno = 0.6 V, and Vtpo = −0.8 V. Considering the CMOS inverter shown in the figure below, (W/L)n = 1/4, (W/L)p = 1, and VDD = 3.3 V. Find (1) expression of Δt = t2−t1, using the integral method, (2) if C = 40 fF, the value of Δt = t2−t1, using the average current method, and (3) based on the result obtained in (2), determine the duration of T and the switching power dissipated in the inverter.

The technological parameters are μnCox = 4μpCox = 40 μA/V2, ∣γ∣ = 0.5 V1/2, 2ϕf = 0.5 V, λ = 0.02 V−1, Vtno = 0.6 V, and Vtpo = −0.8 V. Considering the CMOS inverter shown in the figure below, (W/L)n = 1/4, (W/L)p = 1, and VDD = 3.3 V. Find (1) expression of Δt = t2−t1, using the integral method, (2) if C = 40 fF, the value of Δt = t2−t1, using the average current method, and (3) based on the result obtained in (2), determine the duration of T and the switching power dissipated in the inverter.
Solution
1 0

The introduction to basic logic-circuit concepts that apply to MOSFET circuits is the most popular technology for implementation of digital systems. The two families of MOS logic circuits introduce are NMOS and CMOS (a) Given a NMOS inverter with a current source pull-up using the following specification data: μnCox = 50 μA/V2, μpCox = 25 μA/V2 VTn = −VTp = 1 V, VDD = 5 V, Ln = Lp = 1.5 μm λn = λp = 0.1 V−1 Find the width of the device so its saturation current is 200 μA when VB = 3 V. (5 marks) ii. Calculate the required width of the n-channel device so VOUT is 0.05 V when VIN is 5 V. (5 marks) (b) Consider a simple NMOS inverter with a resistor pull-up as shown in Figure 5 using the following specification data. i. Determine the value of pull-up resistor, R for the inverter. (4 marks) ii. Find the required value for fabrication width and length, (W/L). ( 6 marks) μnCox = 100 μA/V2, VTn = −VTp = 1 V V1 = 5 V, VDD = 5 V, VO = 50 mV, rDS = 50 ohm
Solution
0 0

Q1. Consider the CMOS inverter of which the transistors have the following parameters: μnCox = 4μpCox = 160 μA/V2, ∣γ| = 0.5 V1/2, 2Φf = 0.5 V, λ = 0.001 V−1, Vtno = 0.6 V, Vtpo = −0.8 V, (W/L)n = 1 and (W/L)p = 4. The supply voltage VDD = 3.3 V. The capacitive load at the output node is 20 pF. The input voltage Vin is expected to be a perfect periodic square wave with full swing (low level : 0 V, high level: VDD). (a) Calculate tl, the time required for the output voltage Vout to change from 0 V to the threshold voltage of the inverter, using the average-current method. (b) Write the expression of calculation of t2, the time required for the output voltage Vout to change from 2.9 V to the 0.4 V, using the analytical method (integral). Then calculate t2 using the average-current method. (c) Determine the maximum frequency of the periodic square wave input so that the output signal will have a full swing in each cycle. (d) Calculate the peak value of in, the NMOS transistor current, during the transition, and its average value over a clock cycle T. (The average value here is not the same as the average-current in the "average-current method" for delay estimation) (e) If the capacitive load is now changed to be 250 pF, what can be done to make tl and t2 unchanged?
Solution
0 0