2.1 The peak values of the input sinusoidal voltage and current of a certain amplifier circuit are measured to be 10 mV and 10 μA respectively. When the load resistance is 2 kΩ, the peak value of the output sinusoidal voltage signal is measured to be 2 V. Try to calculate the voltage amplification factor, current amplification factor and power amplification factor of the amplifier circuit, and express them in decibels (dB) respectively. Solution: 2.2 When a load resistance RL of 1 kΩ is connected, the output voltage of the voltage amplifier circuit drops by 20% compared with the output voltage when the load is open. Find the output resistance of the amplifier circuit.
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