Question

Notify Me Bookmark

A. (4 pts) What is gm at this bias point? B. (8 pts) If the maximum current through the gate voltage divider is 12 uA, what are RG1, RG2 ? C. (4 pts) What is the input resistance, Rin? Use the MOSFET common source amplifier circuit to answer the questions that follow. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers. Only your work paper will be graded. Assume saturation. All capacitors are large, such that they are shorted at signal frequencies. Neglect the Early effect (assume VA = infinity ).

A. (4 pts) What is gm at this bias point? B. (8 pts) If the maximum current through the gate voltage divider is 12 uA, what are RG1, RG2 ? C. (4 pts) What is the input resistance, Rin? Use the MOSFET common source amplifier circuit to answer the questions that follow. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers. Only your work paper will be graded. Assume saturation. All capacitors are large, such that they are shorted at signal frequencies. Neglect the Early effect (assume VA = infinity ).

A. (4 pts) What is gm at this bias point? B. (8 pts) If the maximum current through the gate voltage divider is 12 uA, what are RG1, RG2 ? C. (4 pts) What is the input resistance, Rin? Use the MOSFET common source amplifier circuit to answer the questions that follow. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers. Only your work paper will be graded. Assume saturation. All capacitors are large, such that they are shorted at signal frequencies. Neglect the Early effect (assume VA = infinity ).

Image text
A. (4 pts) What is gm at this bias point? B. (8 pts) If the maximum current through the gate voltage divider is 12 uA, what are RG1, RG2 ? C. (4 pts) What is the input resistance, Rin? Use the MOSFET common source amplifier circuit to answer the questions that follow. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers. Only your work paper will be graded. Assume saturation. All capacitors are large, such that they are shorted at signal frequencies. Neglect the Early effect (assume VA = infinity ).

Detailed Answer

0 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

Similar/Related Questions

Use the MOSFET common source amplifier circuit to answer the questions that follow. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers, Only your work paper will be graded. Assume saturation. All capacitors are large, such that they are shorted at signal frequencies. Neglect the Early effect (assume VA = infinity ). A. (4 pts) Design the gate biasing circuit such that Vov = 1 V. What voltage is the gate voltage, VG ? B. (4 pts) Given that RG1 = 2 Mohm, what is RG2 ? C. (4 pts) What is RD ? D. (4 pts) Draw the small signal equivalent circuit of the amplifier. E. (4 pts) What is the amplifier's output resistance, Rout, as indicated on the schematic?

Use the MOSFET common source amplifier circuit to answer the questions that follow. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers, Only your work paper will be graded. Assume saturation. All capacitors are large, such that they are shorted at signal frequencies. Neglect the Early effect (assume VA = infinity ). A. (4 pts) Design the gate biasing circuit such that Vov = 1 V. What voltage is the gate voltage, VG ? B. (4 pts) Given that RG1 = 2 Mohm, what is RG2 ? C. (4 pts) What is RD ? D. (4 pts) Draw the small signal equivalent circuit of the amplifier. E. (4 pts) What is the amplifier's output resistance, Rout, as indicated on the schematic?
Solution
0 0

A. (3 pts) Find the DC bias current, ID. (Ignore the Early effect). B. (3 pts) Find the transconductance of Q1, gm1. (Ignore the Early effect). C. (4 pts) What is the lowest possible output voltage v0 where Q1 still remains in saturation? (Ignore the Early effect). D. (4 pts) Given voltage gain, AV, = -40 V/V and VAn= |VAp|, find VAn. (Hint, output resistances r01 and r02 are equal). Given NMOS integrated common source amplifier below, with parameters as listed, answer the following questions. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers. Only your work paper will be graded. Assume all transistors are in saturation.

A. (3 pts) Find the DC bias current, ID. (Ignore the Early effect). B. (3 pts) Find the transconductance of Q1, gm1. (Ignore the Early effect). C. (4 pts) What is the lowest possible output voltage v0 where Q1 still remains in saturation? (Ignore the Early effect). D. (4 pts) Given voltage gain, AV, = -40 V/V and VAn= |VAp|, find VAn. (Hint, output resistances r01 and r02 are equal). Given NMOS integrated common source amplifier below, with parameters as listed, answer the following questions. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers. Only your work paper will be graded. Assume all transistors are in saturation.

Solution
0 0

In this question, you are asked to find the effective transconductance (Gm) and the resistance into the drain (Rx) of a common-source amplifier with source degeneration. Based on the results, the voltage gain of a common-source amplifier with source degeneration will be evaluated a) The figures shown below are a circuit to find the effective transconductance (G) of the NMOSEFT with source degeneration (left) and its corresponding small-signal circuit (right). It is noted that the output is shorted to VDD (ac grounded) since the definition of effective transconductance is the ratio between the short-circuit output current and the input signal voltage. Prove that Gm is given by Gm = id/vin = gm/1+gmRs In this calculation, the current passing through ro can be neglected since, in general, ro is very large when the NMOSFET operates in saturation region and so this current is very small. Thus, the indication of id is the current of the voltage-controlled current source (gmvgs) only. b) The figure shown below is the method to evaluate the resistance looking into the drain (i.e. Rx) of a source-degenerated NMOSFET. The circuit is shown on the left while the equivalent small-signal modeling is shown on the right. It is noted that the bias condition (VBiAS) is set so that the values of gm and ro, can be defined. Moreover, there is no input signal (i.e. Vin = 0) since we would like to see the value of Rx which is due to the circuit only but not due to the external effect. Based on the above small-signal model, prove that RX = ro(1 + gmRS) The complete common-source amplifier with source degeneration is shown below. c) The complete common-source amplifier with source degeneration is shown below. Prove that the voltage gain of this amplifier is given by v. Vin Explain the reason(s) why the voltage gain is negative. What is the physical meaning of negative voltage gain?

In this question, you are asked to find the effective transconductance (Gm) and the resistance into the drain (Rx) of a common-source amplifier with source degeneration. Based on the results, the voltage gain of a common-source amplifier with source degeneration will be evaluated a) The figures shown below are a circuit to find the effective transconductance (G) of the NMOSEFT with source degeneration (left) and its corresponding small-signal circuit (right). It is noted that the output is shorted to VDD (ac grounded) since the definition of effective transconductance is the ratio between the short-circuit output current and the input signal voltage. Prove that Gm is given by Gm = id/vin = gm/1+gmRs In this calculation, the current passing through ro can be neglected since, in general, ro is very large when the NMOSFET operates in saturation region and so this current is very small. Thus, the indication of id is the current of the voltage-controlled current source (gmvgs) only. b) The figure shown below is the method to evaluate the resistance looking into the drain (i.e. Rx) of a source-degenerated NMOSFET. The circuit is shown on the left while the equivalent small-signal modeling is shown on the right. It is noted that the bias condition (VBiAS) is set so that the values of gm and ro, can be defined. Moreover, there is no input signal (i.e. Vin = 0) since we would like to see the value of Rx which is due to the circuit only but not due to the external effect. Based on the above small-signal model, prove that RX = ro(1 + gmRS) The complete common-source amplifier with source degeneration is shown below. c) The complete common-source amplifier with source degeneration is shown below. Prove that the voltage gain of this amplifier is given by v. Vin Explain the reason(s) why the voltage gain is negative. What is the physical meaning of negative voltage gain?

Solution
1 0