- Task 2 Op Amp Theory 30 Marks A A Differential Amplifier Has An Open Loop Gain Of 175 The Input Signals Are 3 2 V 1 (150.36 KiB) Viewed 23 times
Task 2 - Op-Amp Theory (30 Marks) a) A differential amplifier has an open loop gain of 175. The input signals are 3.2 V and 3.35 V in to the inverting and non-inverting inputs respectively. Calculate the output voltage of the amplifier. (6 Marks) b) Without any feedback into the op-amp, most will have a large open loop gain, forcing the output into saturation, explain what saturation is and with the aid of diagrams explain whether the output will be positive or negative in its nature dependent on the voltage present at the input terminals. (10 Marks) c) A differential amplifier has an open-loop gain of 115, and a common input of 4.0 V to both input terminals. There is an output present of 35 mV. i. Calculate the common mode gain (3 Marks) ii. Calculate the common mode rejection ratio (4 Marks) d) Determine the common mode gain of an op-amp that has a differential voltage gain of 200 x 103 and a common mode rejection ration of 85dB. (7 Marks)