Basic knowledge about differential signal and differential amplifier circuit

There are many applications of differential amplifier circuits in digital Display meters. This article briefly introduces the concept of differential signals, single-ended signals and the role of differential amplifier circuits in graphic form, so that everyone can understand the relevant knowledge of differential amplifier circuits.

There are many applications of differential amplifier circuits in digital Display meters. This article briefly introduces the concept of differential signals, single-ended signals and the role of differential amplifier circuits in graphic form, so that everyone can understand the relevant knowledge of differential amplifier circuits.

1. What is a single-ended signal? What is a differential signal?

Single-ended transmission refers to the use of a signal wire and a ground wire to transmit the signal, and the signal transmitted on the signal line is single-ended

Signal. The advantage is simple and convenient, but the disadvantage is poor anti-interference ability. Differential transmission refers to the transmission of signals on two wires. The two signals are equal in size and opposite in polarity. The signals transmitted on the two wires are differential signals (differential mode signals). The advantage is strong anti-interference ability, but the disadvantage is that the circuit is more complicated than single-ended transmission. 2. What is the function of the differential amplifier circuit?

A differential amplifier circuit is also called a differential amplifier circuit. When the voltages of the two input terminals of the circuit are different, the output voltage changes, so it is called differential.

The differential amplifier circuit has two basic input signals: differential mode and common mode, so what is a common mode signal? When the signals connected to the two input ends are equal in size and opposite in polarity, it is called a differential mode input signal; when the signals connected to the two input ends are equal in size and have the same polarity, it is called a common mode signal.

In practical applications, common mode noise, also called ground noise, is the influence of temperature changes and various environmental noises. It refers to the noise of two wires respectively to the ground.

When the differential amplifier circuit is directly coupled to the basic components of the amplifier circuit, it has a strong inhibitory effect on common-mode signals, and does not amplify and lease differential-mode signals, and the amplification capability of the circuit is related to the output mode.

The related knowledge of differential amplifier circuit is briefly introduced here.