(a) Illustrate the difference between an operational amplifier's practical equivalent model and its ideal model and explain how to analyze an op-amp circuit using the ideal model. (b) Design a summing...

Extracted text: (a) Illustrate the difference between an operational amplifier's practical equivalent model and its ideal model and explain how to analyze an op-amp circuit using the ideal model. (b) Design a summing operational amplifier having the following channel gains: Channel 1: AvcL1 = -6 Channel 2: AvcL2 = -9 Channel 3: AVCL3 = -13 Use an external input resistor, R3 = 30KOhms for channel 3, +Vsupply = ±15 V and +Vsat = 13 V. Draw the circuit and label all components. Use standard resistance values.