Question

Notify Me Bookmark

Q5. Assume the input offset voltage and currents of the op-amp are negligible, and the outputvoltage range of the op amp in Fig. is equal to the power supply voltages. What is the value of vN for the amplifier if the dc input Vin is +4 V. a. OV b. None c. 2 V d. −1 V e. 1 V f. −2 V

Q5. Assume the input offset voltage and currents of the op-amp are negligible, and the outputvoltage range of the op amp in Fig. is equal to the power supply voltages. What is the value of vN for the amplifier if the dc input Vin is +4 V. a. OV b. None c. 2 V d. −1 V e. 1 V f. −2 V

Image text
Q5. Assume the input offset voltage and currents of the op-amp are negligible, and the outputvoltage range of the op amp in Fig. is equal to the power supply voltages. What is the value of v N for the amplifier if the dc input V i n is + 4 V . a. O V b. None c. 2 V d. − 1 V e. 1 V f. − 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

For the two-stage OTA below, assume that Iref = 50 μA and that all transistors are designed for |Veff|= 0.2 V. Assume: |Vt|= 0.5 V for all devices, Vdd = 3 V, M5 and M7 are 2X larger than M8, λ = 0.2V-1. 1. Calculate the total power consumption of this OTA. 2. Complete the table below for the small-signal parameters of all transistors. Transistors Ids Veff gm gds ro μf 3. What is the gain of this OTA in dB? 4. What is the CMRR of this OTA in dB? 5. What is the common-mode input range of the circuit? 6. What is the output swing of this OTA? 7. Assume that this OTA has parasitic capacitances C1 = C2 = 100fF, where C1 is the total shunt capacitance at output of stage 1 and C2 is the same for stage 2. What value of Cc is needed to set the gain-bandwidth product equal to the second-pole location (resulting in 45-deg phase margin)? 8. For this value of Cc, calculate the GBW (in MHz, careful of the 2π ) and slew rate (in V/us), where slew rate is defined as 9. What value of RZ is needed to set the zero location to the LHP at 1.7X the GBW value? 10. For the values you have selected in Table 1, will this OTA have any systematic offset? Why or why not?

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 differential amplifier with a single-ended output is shown below along with the MOSFET parameters. The amplifier is to be designed for a differential mode gain of 10 and a CMRR of 200 . The current source I must have a voltage drop VCS ≥ 1 volt. The voltage V0 = 0 when the MOSFET gates are at ground potential (Va = Vb = 0). Assume the current source I must have a voltage drop of at least Vcs, min = 1 V. MOSFET Parameters kn = 2×10−4 A/V2 Vt = 1 V;VA = 30 V a. Show that the single-ended differential gain can be expressed as Ad = gmro||RD/2 = Ad = kn I VDD(1 + VDD/VA). Hint: Express gm, RD, and ro as functions of the drain current 1 /2. b. Use the result of step #1 to find the required bias current I. c. What should be the value of RD ? d Find the required value of Rss. e. What is the maximum differential input voltage Vid for linear operation. f. What is the common mode input voltage range?
Solution
0 0