The differential amplifier circuit is a common amplifier circuit with the following 10 main functions.
  The main function of the differential amplifier circuit is to amplify the differential mode signal in the input signal. The differential mode signal refers to the voltage difference between the non-inverting end and the inverting end of the input signal. By increasing the amplitude of the differential mode signal, the differential amplifier circuit can increase the strength of the signal and enhance the signal's perceptibility and transmission distance.

Suppress common mode interference

In addition to amplifying differential mode signals, differential amplifier circuits also have the ability to suppress common mode interference. Common mode interference refers to interference signals that exist at both the non-inverting end and the inverting end. They have the same amplitude and phase. By designing the characteristics of the differential amplifier circuit, such as common-mode rejection ratio (CMRR), the impact of common-mode interference on the output signal can be effectively weakened or eliminated.

Improve signal quality

The amplification effect of the differential amplifier circuit can improve the quality of the signal. For weak differential mode signals, amplifying them can make them reach perceptible levels, improving the signal-to-noise ratio and reliability of the signal. At the same time, by suppressing common-mode interference, the differential amplifier circuit can reduce the interference of interference on the signal and improve the purity and clarity of the signal.

Improve the anti-interference ability of the system

Since the differential amplifier circuit has the characteristic of suppressing common-mode interference, it can improve the anti-interference ability of the entire system. In practical applications, common mode interference signals may be introduced for various reasons, such as power supply noise, ground interference, etc. By using differential amplification circuits, the influence of these interference signals can be effectively weakened and the stability and accuracy of the system can be improved.

Adapt to differential signals

Differential amplifier circuits are suitable for processing differential signals. Differential signals refer to the difference signals between adjacent signals, such as differential signal transmission lines, differential signal sensors, etc. By using a differential amplifier circuit, this differential signal can be better processed and amplified, and the accuracy and reliability of signal processing and transmission can be improved.

Realize computing function

Differential amplifier circuits can also implement some basic arithmetic functions, such as addition, subtraction, and multiplication. By properly setting the circuit parameters and input signals, the differential amplifier circuit can add, subtract, and multiply the input signals to achieve signal mixing and transformation.

long distance transmission

A differential amplifier circuit can amplify differential mode signals, thereby increasing the signal transmission distance. During long-distance transmission, signals will experience signal attenuation and noise interference as they pass through transmission lines. By using a differential amplifier circuit, the weak differential mode signal on the transmission line can be enhanced so that it can be effectively transmitted to a distant location. Reduce cross-coupling

In circuit layouts or dense electronic devices, cross-coupling can occur between different signal lines. By using a differential amplifier circuit, the noise and interference at the input end can be reduced to a minimum, reducing mutual interference between signals, and improving the stability and reliability of the system.

Improve linearity

The differential amplifier circuit has good linear characteristics and can improve the linearity of the system. Linearity refers to whether the relationship between the input signal and the output signal conforms to a linear relationship. The differential amplification circuit can perform linear amplification according to a certain amplification factor according to different input signal sizes to maintain the linear relationship between the input and output.

Wide range of applications

Differential amplifier circuits are widely used in various fields, such as audio amplification, power electronics, communication systems, sensors and measuring instruments, etc. Not only in the analog field, differential amplifier circuits also have important applications in digital signal processing, such as differential signal converters (ADCs) and differential communication interfaces.

To sum up: the differential amplifier circuit has many main functions such as amplifying differential mode signals, suppressing common mode interference, improving signal quality, improving the anti-interference ability of the system, adapting to differential signals, and realizing computing functions. It plays a role in various fields. plays an important role.

Eurotech is a worldwide supplier and exporter of electronic components, specializing in ICs, LCDs, Memory, Chips, computer parts, networking equipments and other passive components.

Tel: (86) 755 8395 9469

E-mail: info@eurotech-ic.com