The basic structure, main parameters and ideal characteristics of the amplifier

What are the basic structure, main parameters and ideal characteristics of an amplifier?

Answer: 1. Basic structure: input stage, intermediate stage, output stage, bias circuit
2. Main parameters: 1) Open-loop voltage gain
2) Input resistance
3) Output resistance
4) Common-mode rejection ratio: the ratio of open-loop differential mode gain to open-loop common-mode gain
5) Input offset voltage: a small voltage applied to the input end to ensure that the output voltage is zero
6) Input offset voltage temperature drift
7) Input offset current: the arithmetic difference of the static base current at both ends of the amplifier when the input voltage is zero
8) Input offset current temperature drift
9) Input bias current: the arithmetic mean of the static base current at both ends of the amplifier when the input voltage is zero
10) Maximum common-mode input voltage
11) Maximum differential mode input voltage
12) Rated output voltage
13) Static power consumption: the total power consumed by the positive and negative power supplies of the amplifier when there is no load and no input signal
3. Ideal characteristics: 1) Open-loop voltage gain is infinite
2) Input resistance is infinite
3) Output resistance is zero
4) Common-mode rejection ratio is infinite
5) Input offset voltage, input offset current and its temperature drift are all zero