Assignment:
Question 1. The midrange open gain of a certain op-amp is 100,000. If the open loop critical frequency is 75 Hz, what is the open loop gain at 1 KHz?
Question 2. A certain op-amp has three internal amplifier stages with the following gains and critical frequencies: A1 = 50 dB at f1 = 1000Hz, A2 = 70 dB at f2 = 100Hz, A3 = 30 dB at f3 = 25,000Hz. Determine the open loop midrange dB gain.
Question 3. For the op-amp in problem 2, determine the phase lag when f = f1.
Question 4. The op-amp in figure 1 has a unity-gain bandwidth of 3 MHz and the RF = Find the bandwidth.100Kohms and Ri = 5Kohms. Please note that these figures will be used for the remainder of the exam questions.
Question 5. The op-amp in figure 2 has a unity-gain bandwidth of 3 MHz and the RF = Find the bandwidth.200Kohms and Ri = 4Kohms
Question 6. Using figure 3 find the output voltage if the 3 input voltages are 1V, 2V, and 3V (starting with the top resistor and going down) and RF = 15Kohms
Question 7. Using figure 3 with RF = 15 kohms and 3 input voltages are 1V, 2V, and 3V (starting with the top resistor and going down) find the current through RF.
Question 8. A low pass filter has a critical frequency of 1kHz. What is its bandwidth?
Question 9. A high pass filter has a R = 3kohms and C = 0.0020microF. What is its critical frequency?
Question 10. What is the roll-off rate of a 3rd order low pass filter?
