Question

Notify Me Bookmark

Consider the CMOS amplifier shown below. The circuit has the following parameters: VDD = 2V, Vth = 0.3V, kn = 2mA/V2 and RF = RD = 1kΩ. The input voltage source has zero source impedance. Calculate the value of Vin for which the transistor moves from saturation to linear region. For linear region, use the following I−V equation Id = kn(VGS − Vth)Vds

Consider the CMOS amplifier shown below. The circuit has the following parameters: VDD = 2V, Vth = 0.3V, kn = 2mA/V2 and RF = RD = 1kΩ. The input voltage source has zero source impedance. Calculate the value of Vin for which the transistor moves from saturation to linear region. For linear region, use the following I−V equation Id = kn(VGS − Vth)Vds

Image text
Consider the CMOS amplifier shown below. The circuit has the following parameters: VDD = 2V, Vth = 0.3V, kn = 2mA/V2 and RF = RD = 1kΩ. The input voltage source has zero source impedance. Calculate the value of Vin for which the transistor moves from saturation to linear region. For linear region, use the following I−V equation Id = kn(VGS − Vth)Vds

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 the cascode amplifier shown below. All transistors have their body terminals connected to source terminals. Circuit parameters are as follows: VDD = 5 V, IREF = 160 μA, all transistors have W = 36 μm and L = 0.9 μm, process parameters are: μnCox = 180 μA/V2, μpCox = 60 μA/V2, VTHn = 0.7 V, VTHp = −0.7 V, λ = 0. a) Calculate the dc value of the input voltage vI required to ensure that the dc drain current of transistor M1 is equal to the de drain current provided by the current source. b) Calculate the value of bias voltage VB so that the transistor M1 is biased on the edge of the saturation region. c) Calculate the gain and the output resistance of the amplifier. d) What is the maximum and minimum value of the output voltage for linear amplifier operation, i. e. ensuring that all transistors are operating in the saturation region?
Solution
0 0

In this amplifier circuit, the high and low DC voltage sources are: VDD = 5 V and VSS = −5 V respectively. Consider that all three external capacitors have high values. The PMOS transistor has a threshold voltage equal to Vt = −1 V and kp = kp′(W/L) = 0.4 mA/V2, and the NMOS transistor has a threshold voltage Vt = 1 V and a kn = kn′(W/L) = 2 mA/V2. It was shown in HW#7 that the DC drain voltage of the PMOS transistor is −0.2 V and the DC source of the NMOS transistor is −2 V. a) Perform the small signal analysis of this circuit and determine the voltage gain: AV = Vo/Vi b) Determine the input and output resistance of this amplifier Rin and Rout . c) Discuss what is the purpose of the part of the circuit between CC2 and CC3 which includes the NMOS transistor in this amplifier design. d) Determine the parameters of a simple voltage amplifier model (discussed in chapter 1) which will represent this amplifier. Note that the parameters of the simple voltage amplifier excludes any series resistance of the external source ( Vi ) (in this case it is zero anyway) and the load resistance (in this case RL = 2 kΩ ). e) Using the simple model from part (c) determine the voltage gain AV = Vo/Vi and see if it agrees with the answer of part (a). VDD
Solution
0 0

a) Your job is to design the following circuit, using 2 mA of bias current and achieve a gain of at least 3.5 V/V. You realize that you can bias an amplifier using degeneration resistance using the circuit topology shown below. Calculate values for RS to get 2 mA of current, and RL to get the gain you need. For large signal calculations, you may assume lambda = 0. What is the problem with this amplifier? b) You suggest replacing the load resistance RL with a current source that has a very large output impedance, as shown below. The current source requires a headroom of at least 0.5 V. What is the gain of the amplifier? How does this fix the problem from the previous part? 1 Debugging Amplifiers Suppose you are given an NMOS transistor with the following parameters: In addition, VDD = 5 V.

a) Your job is to design the following circuit, using 2 mA of bias current and achieve a gain of at least 3.5 V/V. You realize that you can bias an amplifier using degeneration resistance using the circuit topology shown below. Calculate values for RS to get 2 mA of current, and RL to get the gain you need. For large signal calculations, you may assume lambda = 0. What is the problem with this amplifier? b) You suggest replacing the load resistance RL with a current source that has a very large output impedance, as shown below. The current source requires a headroom of at least 0.5 V. What is the gain of the amplifier? How does this fix the problem from the previous part? 1 Debugging Amplifiers Suppose you are given an NMOS transistor with the following parameters: In addition, VDD = 5 V.

a) Your job is to design the following circuit, using 2 mA of bias current and achieve a gain of at least 3.5 V/V. You realize that you can bias an amplifier using degeneration resistance using the circuit topology shown below. Calculate values for RS to get 2 mA of current, and RL to get the gain you need. For large signal calculations, you may assume lambda = 0. What is the problem with this amplifier? b) You suggest replacing the load resistance RL with a current source that has a very large output impedance, as shown below. The current source requires a headroom of at least 0.5 V. What is the gain of the amplifier? How does this fix the problem from the previous part? 1 Debugging Amplifiers Suppose you are given an NMOS transistor with the following parameters: In addition, VDD = 5 V.
Solution
1 0