Question
Amplifier Design Need to design and construct a two-stage amplifier using PSPICE with a total voltage gain of A = A1 A2 = -Z where
Amplifier Design Need to design and construct a two-stage amplifier using PSPICE with a total voltage gain of A = A1 A2 = -Z where Z is 24. Let A1 be the gain of the first amplifier and A2 be the gain of the second amplifier. The output of Stage 1 becomes the input of Stage 2. Choose any suitable values |A|1 > 1 and |A2| >1 that you wish (Note that both gains must be strictly larger than 1. No buffers). Assume that the available batteries are 10V and -10V. Using the PSPICE cursor to check whether the overall gain that you get and each stages gain are exactly as planned. Observe the output for a VSIN input of amplitude 0.1V and frequency of 1KHz (in Transient). Use resistors that are in the K range.
Hints: a) Whenever you construct a non-inverting op-amp leave it at its original position - no need to "mirror vertically". However - don't forget to double check that pin 7 receives a positive DC voltage, and pin 4 receives a negative DC voltage, b) In the inverting amplifier you have to mirror the op-amp vertically, but again verify that correct DC voltages reach pins 4 and 7, c) The gain may not be exactly -Z, because the 741 op-amp is not "ideal". It is only "almost ideal". Checking the peak-to-peak output amplitude will show you that the error is very small, d) If the gain of Z is relatively large, you may probably use multiple plots or multiple Y axes, to see each signal at full scale, (e) Initially when you set the simulation parameters for the Transient / Time response leave the Maximum Step Size entry blank and observe how wrong the simulation results look (i.e. the signals are supposed to look smooth, but if the step size is wrong they may have corners), (f) Now set the maximum step size to be 1/1000 of the input signals period and see the correct results.
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