Question

Notify Me Bookmark

The op amps in the figure are assumed to be ideal devices. In this question, find the voltage gain, vO/vl, of the circuit. +9 V/V +10 V/V -5V/V -10V/V -9V/V.

The op amps in the figure are assumed to be ideal devices. In this question, find the voltage gain, vO/vl, of the circuit. +9 V/V +10 V/V -5V/V -10V/V -9V/V.

Image text
The op amps in the figure are assumed to be ideal devices. In this question, find the voltage gain, vO/vl, of the circuit. +9 V/V +10 V/V -5V/V -10V/V -9V/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

The op amps in the figure are assumed to be ideal devices. Find the input resistance, Rin, as defined on the figure above. Infinity 10 kΩ 100 kΩ 20 kΩ 5kΩ.
Solution
0 0

The below BJT common-emitter amplifier with β = 100 is fed with a signal source that has a resistance of 5 kΩ. A load resistor of 5 kΩ is connected to the output of the circuit as shown in the figure. The input resistance of the amplifier is Ri = 2 kΩ and its output resistance is Ro = 5 kΩ. Find the bias current (1), and the small signal parameters. Use VT = 25 mV. If the peak value of Vπ (denoted by V^π ) is to be limited to 5 mV, what are the corresponding peak value of Vsig (denoted by V^sig ) and peak value of V0 (denoted by v^0 ) in presence of the load resistor? Instructions: Use the given input and output resistance values and the equations related to these quantities (from the lecture notes) to find the small signal parameters and the bias current. To find the peak value of vsig, you need to draw the small signal circuit. replace v/with vsig in series with a 5 k resistor. From the signal circuit, find out how Vπ is related to Vsig. Calculate the open loop voltage gain, and use it with the given load resistor value and the voltage amplifier model to find out how V0 is related to Vsig in the presence of the load. You can also solve the signal circuit to find the answer. v^sig = 17.5 mV V^0 = 1.5 V v^0 = 0.4 V
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