Question

Notify Me Bookmark

Both MOSFETs in the circuit shown have VT = 1 V and k = 4 mA/V2. The voltage vA is given by vA = 0.4 + 0.1sin⁡(2πt) where t is in ms and vA is in V. Determine v0.

Both MOSFETs in the circuit shown have VT = 1 V and k = 4 mA/V2. The voltage vA is given by vA = 0.4 + 0.1sin⁡(2πt) where t is in ms and vA is in V. Determine v0.

Image text
Both MOSFETs in the circuit shown have V T = 1 V and k = 4 m A / V 2 .
The voltage v A is given by v A = 0.4 + 0.1 sin ⁡ ( 2 π t ) where t is in m s and v A is in V . Determine v 0 .

Detailed Answer

0 0

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

Doubtrix Logo

Problem is not yet solved!

Click on Notify me to get email when question is answered.

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
Notify me Login Sign Up

Similar/Related Questions

QUESTION 3 This question examines large signal behaviour of transistor circuits (a) Assume that the MOSFET in Figure 3.1 is operating in saturation and is characterised by a threshold voltage, VT = 1 V. Assume that the parameter, K = 1 mA/V2 where the drain-source current in the MOSFET in saturation is given by equation (3.1). iDS(sat) = K2(vGS−VT)2 Show that the gate-source voltage, vGS, for the circuit shown in Figure 3.1 may be written in terms of the input voltage, vIN, and the output voltage vO, by equation ( 3.2 ): vGS = vINR2 R1+R2 + vOR1 R1+R2 Figure 3.1 (b) For the circuit shown in Figure 3.1, calculate the minimum possible value of output voltage, vO when vIN = 5 V assuming that the MOSFET is maintained in saturation. Assume Rl = R2 = 10 kΩ, and RL = 1 kΩ (c) For the circuit shown in Figure 3.1, determine the value of the constant voltage source, VS, if vO = 4 V when vIN = 5 V and all other circuit parameters are as descirbed in Q3, part (b).

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

Assume that the MOSFET has the following parameters: Vt = 1 V, K = 0.4 mA/V2 VA = 40 V. It is connected as an amplifier as shown in Figure Q4 and vs is an AC input voltage and vo is the AC output voltage. The DC drain voltage VD is set to be 0 V. Further assume that all the capacitors in the circuit are very large. Figure Q7. (a) Which type of amplifier configuration does the above circuit (3 marks) belong to? What are the electrical properties of this type of amplifier configuration? (b) Show that the MOS transistor operates in the saturation mode. (3 marks) State one electrical characteristic of a saturated MOS transistor. (c) Determine the drain current ID. (10 marks) (d) Design the load resistance RL such that the AC voltage gain vo/vs of (10 marks) the MOSFET amplifier equals -10 . (e) Suppose the amplitude of AC input vs is 0.2 V and the AC voltage (4 marks) gain of the amplifier equals -10. Do we have a distorted AC output waveform?

Solution
0 0