DC Coupled Wideband Feedback Amplifier Voltage-Shunt Feedback Amplifier Current-Shunt Feedback Amplifier Voltage-Series Feedback Amplifier Using the...
DC Coupled Wideband Feedback Amplifier
Voltage-Shunt Feedback Amplifier
Current-Shunt Feedback Amplifier
Voltage-Series Feedback Amplifier
Using the four amplifiers above, analyze the answers to the questions below.
1) Which amplifier has the largest gain-bandwidth product referring to your table of gain bandwidth products?
Answer:
2) On the basis of experimental results, state the effects of negative feedback on gain, and input resistance.
Answer:
3) State the difference between current and voltage feedback.
Answer:
Homework Answers
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DC Coupled Wideband Feedback Amplifier
Voltage-Shunt Feedback Amplifier
Current-Shunt Feedback Amplifier
Voltage-Series Feedback Amplifier
Using the...
Question 4: Figure 4 In the series-shunt feedback amplifier shown in Figure 4, the transistors are...
Question 4: Figure 4 In the series-shunt feedback amplifier shown in Figure 4, the transistors are biased with ideal current-sources 1, 0.1mA, 12 1mA, the devices operate with VE0.7V and t = 100. The input signal V, has a zero DC component. Resistances are (a) If the open loop gain is large, what do you expect the closed-loop gain A, -V/V, to be? Give both an expression and its approximate value (b) Find the DC emitter current in each of...
choose the correct answers A inverting opamp is an example of a shunt-series feedback The current...
choose the correct answers A inverting opamp is an example of a shunt-series feedback The current mirror is an example of series-series feedback The operational transconductance amplifier is an example of current sampling-voltage mixing feedback A trans resistance amplifier can be used to amplifier a small photodiode current. It is an example of shunt-shunt feedback
Problem 2 Consider the feedback amplifier circuit on Figure P2. The DC current gain of transistor Q3 is -100 1. What type of feedback (or what feedback topology) do we have on the circuit in Figure P...
Problem 2 Consider the feedback amplifier circuit on Figure P2. The DC current gain of transistor Q3 is -100 1. What type of feedback (or what feedback topology) do we have on the circuit in Figure P2? 2. Draw the A-circuit. Express and compute the open-loop voltage gain A at mid-band frequency 3, Draw the γ-circuit. Express and compute the feedback factor γ 4. Express and compute the overall gain of the feedback amplifier Ap Express and compute the input...
1. The feedback is negative. True or False? 2. Find the value of the forward amplifier...
1. The feedback is negative. True or
False?
2. Find the value of the forward amplifier gain
3. If R1=10kΩ, what value should R2 have to have a feedback
factor of 1/2?
4. The closed-loop gain is about …
(Hint: The closed-loop gain is positive)
A) 1.5
B) 2.8
C) 1.9
D) 3.7
5) If the overall forward amplifier has a 150 Hz bandwidth (due
to a single dominant pole), the bandwidth of the closed-loop
circuit would be around …...
EEET255 Electronics Page 4 of6 QUESTION 3: [25 marks] Figure 3 shows a feedback amplifier circuit...
EEET255 Electronics Page 4 of6 QUESTION 3: [25 marks] Figure 3 shows a feedback amplifier circuit R, is the source resistor, R is the feedback resistor and R, is the load resistor. The op-amp has an internal input resistance of R, an intemal output resistance R, and an internal gain of A Apply the "Systematic Analysis" method in this question. Figure 3 3.a State the feedback topology used in the amplifier circuit and which type of feedback amplifier is shown...
c) In estimating DC imperfections (input offset voltage, input offset current and the inverting amplifier with...
c) In estimating DC imperfections (input offset voltage, input offset current and the inverting amplifier with nominal gain of -100 using 1 current) of an op-map, an and 10MQ resistors is implemented using the op-amp as shown in Fig 2(a) below R2 10MQ R 100k Vi Vo Figure 2(a): Inverting amplifier Measurements are conducted on the output voltage of the inverting amplifier under the following conditions: (i) the input (V) is open circuited and the output voltage is found to...
Find the induction process of A, β, Ro, Ri. EXAMPLE 10.10 Figure 10.27 shows a feedback current amplifier formed by cas...
Find the induction process of A, β, Ro, Ri.
EXAMPLE 10.10 Figure 10.27 shows a feedback current amplifier formed by cascading an inverting voltage amplifier u witha MOSFET Q. The output current I, is the drain current of Q. The feedback network, consisting of resistors R, and R, senses an exactly equal current, namely, the source current of Q, and provides feedback current signal that is mixed with I, at the input node. Note that the bias arrangement is not...
This direct coupled emitter follower amplifier using a reference current mirror to produce a blasttent for...
This direct coupled emitter follower amplifier using a reference current mirror to produce a blasttent for the di transistor The parameters for the circuit are as follows: . Vcc = -Ves = 5V • All transistors. Qı, Q2, Qs, are matched with the following parameters + 8 = 100 , Is = 10- A (Hints: You must solve for for all transistors. You may need to lerate once or twice to solve the recent with the foresistor in the Qiraulties...
Question 1 (10 marks) Figure 10 Rc2 shunt-shunt28R feedback amplifier circuit The resistors values and the transistors parameters are also indicated in Figure 1 1,-0.3mA 285m Hint: in DC analysis...
Question 1 (10 marks) Figure 10 Rc2 shunt-shunt28R feedback amplifier circuit The resistors values and the transistors parameters are also indicated in Figure 1 1,-0.3mA 285m Hint: in DC analysis; 1) For R,-104, determine the small-signal closed-loop current-gain'. 2) Determine the small-signal open-loop current-gain 3) From the results of 2) and 3), determine the loop-gain T: Hint: If you did not solve 2), assume If you did not solve 3), assume600
Question 1 (10 marks) Figure 10 Rc2 shunt-shunt28R feedback...
QUESTION (5) The following series-shunt feedback amplifier is already biased properly. +VDD I Rp2Z Rois Tove...
QUESTION (5) The following series-shunt feedback amplifier is already biased properly. +VDD I Rp2Z Rois Tove M a) Identify the feedback network (B circuit) and provide an expression for B. Also give an expression for the ideal or upper-bound value of the closed-loop gain Af. You can neglect the output resistance ro for Mi and M2. (6 points) b) Determine the ratio Rz/Ri that will provide an ideal closed-loop gain of 10 V/V. If R1 = 1 k12, what should...
Question 4: Figure 4 In the series-shunt feedback amplifier shown in Figure 4, the transistors are biased with ideal current-sources 1, 0.1mA, 12 1mA, the devices operate with VE0.7V and t = 100. The input signal V, has a zero DC component. Resistances are (a) If the open loop gain is large, what do you expect the closed-loop gain A, -V/V, to be? Give both an expression and its approximate value (b) Find the DC emitter current in each of...
choose the correct answers A inverting opamp is an example of a shunt-series feedback The current mirror is an example of series-series feedback The operational transconductance amplifier is an example of current sampling-voltage mixing feedback A trans resistance amplifier can be used to amplifier a small photodiode current. It is an example of shunt-shunt feedback
Problem 2 Consider the feedback amplifier circuit on Figure P2. The DC current gain of transistor Q3 is -100 1. What type of feedback (or what feedback topology) do we have on the circuit in Figure P2? 2. Draw the A-circuit. Express and compute the open-loop voltage gain A at mid-band frequency 3, Draw the γ-circuit. Express and compute the feedback factor γ 4. Express and compute the overall gain of the feedback amplifier Ap Express and compute the input...
1. The feedback is negative. True or
False?
2. Find the value of the forward amplifier gain
3. If R1=10kΩ, what value should R2 have to have a feedback
factor of 1/2?
4. The closed-loop gain is about …
(Hint: The closed-loop gain is positive)
A) 1.5
B) 2.8
C) 1.9
D) 3.7
5) If the overall forward amplifier has a 150 Hz bandwidth (due
to a single dominant pole), the bandwidth of the closed-loop
circuit would be around …...
EEET255 Electronics Page 4 of6 QUESTION 3: [25 marks] Figure 3 shows a feedback amplifier circuit R, is the source resistor, R is the feedback resistor and R, is the load resistor. The op-amp has an internal input resistance of R, an intemal output resistance R, and an internal gain of A Apply the "Systematic Analysis" method in this question. Figure 3 3.a State the feedback topology used in the amplifier circuit and which type of feedback amplifier is shown...
c) In estimating DC imperfections (input offset voltage, input offset current and the inverting amplifier with nominal gain of -100 using 1 current) of an op-map, an and 10MQ resistors is implemented using the op-amp as shown in Fig 2(a) below R2 10MQ R 100k Vi Vo Figure 2(a): Inverting amplifier Measurements are conducted on the output voltage of the inverting amplifier under the following conditions: (i) the input (V) is open circuited and the output voltage is found to...
Find the induction process of A, β, Ro, Ri.
EXAMPLE 10.10 Figure 10.27 shows a feedback current amplifier formed by cascading an inverting voltage amplifier u witha MOSFET Q. The output current I, is the drain current of Q. The feedback network, consisting of resistors R, and R, senses an exactly equal current, namely, the source current of Q, and provides feedback current signal that is mixed with I, at the input node. Note that the bias arrangement is not...
This direct coupled emitter follower amplifier using a reference current mirror to produce a blasttent for the di transistor The parameters for the circuit are as follows: . Vcc = -Ves = 5V • All transistors. Qı, Q2, Qs, are matched with the following parameters + 8 = 100 , Is = 10- A (Hints: You must solve for for all transistors. You may need to lerate once or twice to solve the recent with the foresistor in the Qiraulties...
Question 1 (10 marks) Figure 10 Rc2 shunt-shunt28R feedback amplifier circuit The resistors values and the transistors parameters are also indicated in Figure 1 1,-0.3mA 285m Hint: in DC analysis; 1) For R,-104, determine the small-signal closed-loop current-gain'. 2) Determine the small-signal open-loop current-gain 3) From the results of 2) and 3), determine the loop-gain T: Hint: If you did not solve 2), assume If you did not solve 3), assume600
Question 1 (10 marks) Figure 10 Rc2 shunt-shunt28R feedback...
QUESTION (5) The following series-shunt feedback amplifier is already biased properly. +VDD I Rp2Z Rois Tove M a) Identify the feedback network (B circuit) and provide an expression for B. Also give an expression for the ideal or upper-bound value of the closed-loop gain Af. You can neglect the output resistance ro for Mi and M2. (6 points) b) Determine the ratio Rz/Ri that will provide an ideal closed-loop gain of 10 V/V. If R1 = 1 k12, what should...
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