This is a design circuit for a Single-cell microphone amplifier circuit. This circuit produces a voltage gain of 60 dB at 500Ω load with bandwidth 5 kHz. This circuit can provide a 60dB gain up to 10 kHz if it is unloaded. This circuit has a 10 kΩ input impedance. Here’s the figure of the circuit;
This circuit cannot neither produces an output swing closer than 800mV or below 150mV to the supply. However this circuit still has an input noise of 40 to 50 nV/√Hz. [Circuit diagram source: National Semiconductor Application Notes]
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