20 Classic Analog Circuits That Engineers Must Know (Detailed Illustrations and Text) Part 3

11. Differential amplifier circuit

Points to note:

1. The functions of each component of the circuit, the purpose of the circuit, and the characteristics of the circuit;

2. Analysis of the working principle of the circuit. How to amplify the differential mode signal and suppress the common mode signal;

3. The circuit's single-ended input and double-ended input, single-ended output and double-ended output working modes.

12. Field Effect Transistor Amplifier Circuit

Points to note:

1. Classification, characteristics, structure, transfer characteristics and output characteristic curve of field effect tubes;

2. Characteristics of field effect amplifier circuit;

3. Application scenarios of field effect amplifier circuits.

13. Frequency-selective (bandpass) amplifier circuit

Frequency Selective Amplifier Circuit

Points to note:

1. The function of each component, the characteristics of the frequency-selective amplifier circuit, and the function of the circuit;

2. Calculation of characteristic frequency and selection of frequency selection component parameters.

14. Operational Amplifier Circuit

Points to note:

1. The concept of an ideal operational amplifier. The difference between a virtual short circuit and a virtual open circuit at the input of an operational amplifier;

2. The main purpose of the op amp circuit with inverting input mode, and the phase of the input voltage and output voltage signal;

3. Gain expression (input impedance, output impedance) under the same-phase input mode.

15. Differential Input Operational Amplifier Circuit

Points to note:

1. Characteristics and uses of differential input operational amplifier circuit;

2. The relationship between output signal voltage and input signal voltage.

16. Voltage Comparison Circuit

Voltage Comparator Circuit

Points to note:

1. The function and working process of voltage comparator;

2. Input-output characteristic curve of comparator;

3. How to construct a hysteresis comparator.