Question

| | Q1 | Q2 | Q3 | Q4 | | :--- | :--- | :--- | :--- | :--- | | | AA | BB | CC, DD | EE, FF | | PXXXXXXX0 | 45 | 24 | +10, -10 | 92, 40 | | PXXXXXXX1 | 50 | 22 | +7.5, -7.5 | 95, 37 | | PXXXXXXX2 | 55 | 20 | +5, -5 | 98, 40 | | PXXXXXXX3 | 60 | 20 | +5, -5 | 101, 37 | | PXXXXXXX4 | 65 | 22 | +7.5, -7.5 | 104, 40 | | PXXXXXXX5 | 65 | 24 | +10, -10 | 104, 40 | | PXXXXXXX6 | 60 | 24 | +10, -10 | 101, 37 | | PXXXXXXX7 | 55 | 22 | +7.5, -7.5 | 98, 40 | | PXXXXXXX8 | 50 | 20 | +5, -5 | 95, 37 | | PXXXXXXX9 | 45 | 20 | +5, -5 | 92, 40 | Q.1: Various amplifier and load combinations are measured as listed below using rms values. For each, find the voltage, current, and power gains (Av, Ai, and Ap, respectively) both as ratios and in dB: (a) vi = 25 mV, ii = 100 ?A, vo = 5 V, RL = AA ? (b) vi = 125 ?V, ii = 100 nA, vo = 1.25 V, RL = 10 k? Q.2: A transconductance amplifier with Ri = 2 k?, Gm = BB mA/V, and Ro = 5 k? is fed with a voltage source having a source resistance of 500 ? and is loaded with a 1-k? resistance. Sketch the circuit and find the voltage gain realized. Q.3: Figure shows a circuit that provides an output voltage vo whose value can be varied by turning the wiper of the 100-k? potentiometer. Find the range over which vo can be varied. If the potentiometer is a "20-turn" device, find the change in vo corresponding to each turn of the pot. The V+ = CC, and V- = DD volts. Q.4: A measurement of the open loop gain of an internally compensated op amp at very low frequencies shows it to be EE dB. At 100 kHz it is FF dB. Estimate values for Avo, f?, and ft.

          | | Q1 | Q2 | Q3 | Q4 |
| :--- | :--- | :--- | :--- | :--- |
| | AA | BB | CC, DD | EE, FF |
| PXXXXXXX0 | 45 | 24 | +10, -10 | 92, 40 |
| PXXXXXXX1 | 50 | 22 | +7.5, -7.5 | 95, 37 |
| PXXXXXXX2 | 55 | 20 | +5, -5 | 98, 40 |
| PXXXXXXX3 | 60 | 20 | +5, -5 | 101, 37 |
| PXXXXXXX4 | 65 | 22 | +7.5, -7.5 | 104, 40 |
| PXXXXXXX5 | 65 | 24 | +10, -10 | 104, 40 |
| PXXXXXXX6 | 60 | 24 | +10, -10 | 101, 37 |
| PXXXXXXX7 | 55 | 22 | +7.5, -7.5 | 98, 40 |
| PXXXXXXX8 | 50 | 20 | +5, -5 | 95, 37 |
| PXXXXXXX9 | 45 | 20 | +5, -5 | 92, 40 |

Q.1: Various amplifier and load combinations are measured as listed below using rms values. For each, find the voltage, current, and power gains (Av, Ai, and Ap, respectively) both as ratios and in dB:
(a) vi = 25 mV, ii = 100 ?A, vo = 5 V, RL = AA ?
(b) vi = 125 ?V, ii = 100 nA, vo = 1.25 V, RL = 10 k?

Q.2: A transconductance amplifier with Ri = 2 k?, Gm = BB mA/V, and Ro = 5 k? is fed with a voltage source having a source resistance of 500 ? and is loaded with a 1-k? resistance. Sketch the circuit and find the voltage gain realized.

Q.3: Figure shows a circuit that provides an output voltage vo whose value can be varied by turning the wiper of the 100-k? potentiometer. Find the range over which vo can be varied. If the potentiometer is a "20-turn" device, find the change in vo corresponding to each turn of the pot. The V+ = CC, and V- = DD volts.

Q.4: A measurement of the open loop gain of an internally compensated op amp at very low frequencies shows it to be EE dB. At 100 kHz it is FF dB. Estimate values for Avo, f?, and ft.

| | Q1 | Q2 | Q3 | Q4 |
| :— | :— | :— | :— | :— |
| | AA | BB | CC, DD | EE, FF |
| PXXXXXXX0 | 45 | 24 | +10, -10 | 92, 40 |
| PXXXXXXX1 | 50 | 22 | +7.5, -7.5 | 95, 37 |
| PXXXXXXX2 | 55 | 20 | +5, -5 | 98, 40 |
| PXXXXXXX3 | 60 | 20 | +5, -5 | 101, 37 |
| PXXXXXXX4 | 65 | 22 | +7.5, -7.5 | 104, 40 |
| PXXXXXXX5 | 65 | 24 | +10, -10 | 104, 40 |
| PXXXXXXX6 | 60 | 24 | +10, -10 | 101, 37 |
| PXXXXXXX7 | 55 | 22 | +7.5, -7.5 | 98, 40 |
| PXXXXXXX8 | 50 | 20 | +5, -5 | 95, 37 |
| PXXXXXXX9 | 45 | 20 | +5, -5 | 92, 40 |

Q.1: Various amplifier and load combinations are measured as listed below using rms values. For each, find the voltage, current, and power gains (Av, Ai, and Ap, respectively) both as ratios and in dB:
(a) vi = 25 mV, ii = 100 ?A, vo = 5 V, RL = AA ?
(b) vi = 125 ?V, ii = 100 nA, vo = 1.25 V, RL = 10 k?

Q.2: A transconductance amplifier with Ri = 2 k?, Gm = BB mA/V, and Ro = 5 k? is fed with a voltage source having a source resistance of 500 ? and is loaded with a 1-k? resistance. Sketch the circuit and find the voltage gain realized.

Q.3: Figure shows a circuit that provides an output voltage vo whose value can be varied by turning the wiper of the 100-k? potentiometer. Find the range over which vo can be varied. If the potentiometer is a "20-turn" device, find the change in vo corresponding to each turn of the pot. The V+ = CC, and V- = DD volts.

Q.4: A measurement of the open loop gain of an internally compensated op amp at very low frequencies shows it to be EE dB. At 100 kHz it is FF dB. Estimate values for Avo, f?, and ft.

Added by Felipe J.

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