Question

Notify Me Bookmark

An NMOS transistor having Vt = 1 V and kn = kn'(W/L) = 1 mA/V2 is operating in the amplifier circuit shown. The DC node voltages at all nodes are indicated on the circuit diagram. Assuming the amplifier is operating linearly in the mid-band frequency range, determine the value of the small-signal Thevenin's equivalent output resistance, Ro = vx/ix (with vsig = 0). a. 667 Ω b. 3 kΩ C. 1.5 kΩ d. 2 kΩ e. 4 kΩ

An NMOS transistor having Vt = 1 V and kn = kn'(W/L) = 1 mA/V2 is operating in the amplifier circuit shown. The DC node voltages at all nodes are indicated on the circuit diagram. Assuming the amplifier is operating linearly in the mid-band frequency range, determine the value of the small-signal Thevenin's equivalent output resistance, Ro = vx/ix (with vsig = 0). a. 667 Ω b. 3 kΩ C. 1.5 kΩ d. 2 kΩ e. 4 kΩ

Image text
An NMOS transistor having V t = 1 V and k n = k n n ( W / L ) = 1 m A / V 2 is operating in the amplifier circuit shown. The DC node voltages at all nodes are indicated on the circuit diagram. Assuming the amplifier is operating linearly in the mid-band frequency range, determine the value of the small-signal Thevenin's equivalent output resistance, R o = v x / i x ( with v s i g = 0 ) .
a. 667 Ω
b. 3 k Ω
C. 1.5 k Ω
d. 2 k Ω
e. 4 k Ω

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

An NMOS transistor having Vt = 1 V and kn = 1.0 mA/V2 is operating in the amplifier circuit shown. The DC node voltages at all nodes are indicated on the circuit diagram. Assuming the amplifier is operating linearly in the mid-band frequency range, determine the value of the small-signal Thevenin's equivalent output resistance, RO = vX/iX (with vsig = 0). a. 3 kΩ b. 1 kΩ c. 2 kΩ d. 4 kΩ e. 5 kΩ

Solution
2 0

Question 2 The following parameters have been defined for the MOSFET amplifier circuit shown in Figure 2.1: VDD = 20 V, R1 = 2.2 MΩ, R2 = 1.8 MΩ, RD = 1.5 kΩ. (a) Given that the MOSFET has the parameters K = 0.475 mA/V2 and a turn-on voltage, Vto = 2.1 V, calculate the value of source resistance, Rs, needed to set a DC bias drain current of ID = 4 mA. [6 marks] (b) With Rs set at the value calculated in part (a), determine the value of the drain voltage, VD, and confirm whether or not the MOSFET is operating in the saturation region. [5 marks] (c) If the MOSFET has rd = 10 kΩ, complete the small-signal equivalent model for the amplifier circuit and calculate its input resistance, output resistance, open-circuit gain (i.e., with RL = ∞) and overall gain (when RL = 1 kΩ). [9 marks] Figure 2.1
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