Voice intelligibility is an essential requirement in the design of first responder’s communication equipment. At a Base Station (i.e., dispatcher’s end point), 60 Hz and its harmonics, from the ac power line feeding the Base Station, can affect the voice intelligibility of the audio signal, if it is present on the supply line, and on the audio amplifier input.
Assuming that the supply line is free of the 60Hz noise, design a non-inverting Op-amp amplifier using the LM324 providing:
a) 20dB minimum Gain
b) 300Hz cutoff frequency with 18dB minimum attenuation at 60Hz
The Op-amp must be feed from a single 5V supply
Explain what modifications have to be made to the design to provide maximum symmetrical output voltage swing.
Using 5% resistors tolerance determine:
a) The maximum and minimum voltage Gain of the amplifier
b) The analog ground voltage range at the Op-Amp output
This assignment will only be accepted on engineering paper.
All calculations must be shown.
Simulate your design using PSpice and demonstrate that the design meets the required specifications.
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