Design an audio amplifier / booster employing a transistor long-tail pair input stage (BJT or MOS) and a 250 mW BJT class-AB complementary output stage to drive a 25 Ω earphone speaker using discreet transistors. Ensure maximum output compliance using a max +6 V supply rail and a minimum total voltage gain of 20. The amplifier is to be driven by a mobile phone so input impedance must > 32 Ω to avoid damaging its audio output port.
Long tail pair transistors: Small Signal BJT NPN,
a)- Obtain the device datasheets, extract, tabulate and present any data pertinent to this design and give reasons for your choice of devices.
b)- Calculate all resistor values, each stage’s voltage gain, total DC circuit power dissipated when quiescently biased with no signal input, maximum RMS power output, the circuit’s power efficiency and input stage input resistance. Include full circuit schematics in your report.
c)- Simulate the circuit and compare simulated and calculated results, commenting on any discrepancies. You must use the components you have chosen in your simulations (e.g. use the correct transistor models).
d)- Determine your amplifier’s CMRR by simulation.
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