Question

Notify Me Bookmark

5.11 A p-channel MOSFET with a threshold voltage Vtp = -0.7 V has its source connected to ground. (a) What should the gate voltage be for the device to operate with an overdrive voltage of |VOV| = 0.4 V? (b) With the gate voltage as in (a), what is the highest voltage allowed at the drain while the device operates in the saturation region? (c) If the drain current obtained in (b) is 0.5 mA, what would the current be for VD = −20 mV and for VD = −2 V?

5.11 A p-channel MOSFET with a threshold voltage Vtp = -0.7 V has its source connected to ground. (a) What should the gate voltage be for the device to operate with an overdrive voltage of |VOV| = 0.4 V? (b) With the gate voltage as in (a), what is the highest voltage allowed at the drain while the device operates in the saturation region? (c) If the drain current obtained in (b) is 0.5 mA, what would the current be for VD = −20 mV and for VD = −2 V?

Image text
5.11 A p -channel MOSFET with a threshold voltage V t p = -0.7 V has its source connected to ground. (a) What should the gate voltage be for the device to operate with an overdrive voltage of | V O V | = 0.4 V ? (b) With the gate voltage as in (a), what is the highest voltage allowed at the drain while the device operates in the saturation region? (c) If the drain current obtained in (b) is 0.5 mA , what would the current be for V D = − 20 mV and for V D = − 2 V ?

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

(P5.11) A p-channel MOSFET with a threshold voltage of Vtp = −0.7 V has its source connected to ground. i. What should the gate voltage be for the device to operate with and overdrive voltage of |VOV| = 0.4 V? ii. With the gate voltage as in (i), what is the highest voltage allowed at the drain while the device operates in the saturation region? iii. If the drain current obtained in (ii) is 0.5 mA, what would the current be for VD = −20 mV and VD = −2 V? Answers: 5.11 (a) −1.1 V; (b) −0.4 V; (c) 0.05 mA; 0.5 mA
Solution
2 0

In the circuit below, the supply voltage is VDD = 2.5 V and the MOS transistors have process transconductance parameters μnCox = 0.3 mAV2 and μPCox = 0.2 mAV2, threshold voltages Vtn = −Vtp = 0.4 V, channel-length modulation coefficients λn = −λp = 0.1 V^−1, and channel lengths L1 = L2 = 0.2 μm. (a) Choose the widths of the transistors, W 1 and W 2, and the gate bias voltages, VG1 and VG2, such that the dc output voltage be Vo = VDD/2 and all transistors operate in saturation with an overdrive voltage of 0.5 V and a drain current of 85 μA. (b) Find the small-signal voltage gain vo/vi. Calculate the largest peak-to-peak amplitude of the input sinusoid vi and the corresponding amplitude of the output sinusoid vo that the circuit can handle while all transistors remain in saturation region.
Solution
0 0

For an NMOS differential pair with a common-mode voltage VCM applied, as shown below. Let VDD = VSS = 1.0 V, kn’ = 0.4 mA/V2, (W/L) = 12.5, Vtn = 0.5 V, I = 0.2 mA, RD = 10 kΩ, and neglect channel-length modulation. (a) Find VOV and VGS for each transistor. (b) For VCM = +0.3 V, find VS, ID1, ID2, VD1, and VD2. (c) What is the highest value of VCM for which Q1 and Q2 remain in saturation? (d) If current source / requires a minimum voltage of 0.2 V to operate properly, what is the lowest value allowed for Vs and hence for VCM ?
Solution
1 0