Basic knowledge of inverting operational amplifier

The open-loop gain (AVO) of operational amplifiers can be very high, up to 1000000 (120dB) or more. However, this very high gain is of no practical use to us because it makes the amplifier unstable and difficult to control, because the smallest input signal, just a few microvolts (μ V), is enough to saturate the […]

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What is the difference between comparator and operational amplifier

In IC and analog circuits, constant current amplifiers are often used in analog circuits and circuits. Because of the internal circuit configuration, the operational amplifier circuit and the comparator circuit are basically composed of differential amplifiers using differential input, and they are very similar. So what’s the difference? The answer is: (1) The comparator is […]

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Basic principle of interleaved sampling ADC

Author: Jonathan Harris, ADI Application Engineer brief introduction In many market segments today, interleaved analog-to-digital converter (ADC) has many advantages in many applications. In the communication infrastructure, there is a driving factor to increase the sampling rate of ADC to support multi band and multi carrier radio, in addition to meeting the wider bandwidth requirements […]

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Parameters of power amplifier

Active sonar emits sound wave through sonar itself, detects target according to echo reflected by acoustic signal, and determines target position and motion parameters. Underwater acoustic signal transmitter is a very important part of active sonar equipment. It generates a specific form of high-power electrical signal, which is converted into acoustic energy and radiated to […]

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The basic operational amplifier circuit and its characteristics

Operational amplifier (OP) is a high gain analog IC composed of multi-stage direct coupled amplifier. Compared with the circuit composed of separated components, operational amplifier has the advantages of good stability, easy circuit calculation and low cost, so it is widely used. It can complete signal amplification, signal operation, signal processing, waveform transformation and other […]

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Five fault examples of inverter differential amplifier

For the dual requirements of anti-interference and electrical isolation, the front-stage circuit of inverter output current detection or voltage detection usually uses the “matching” circuit of linear optocoupler and differential amplifier to complete the transmission task of detection signal. The circuit form of the differential amplifier is shown in Fig. 1. Taking the current detection […]

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Differential amplifier circuit with bias voltage

When the operational amplifier circuit is powered by a single power supply and processes alternating signals, it usually adopts the method of pre adding bias voltage to obtain complete signal output. In theoretical analysis, the ratio of feedback voltage to input resistance can not be used to get the definite value. If the calculation is […]

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What is the function of Agca

Automatic gain control (AGC) is short for AGC. An automatic control method in which the gain of the amplifier circuit is automatically adjusted with the signal strength. The circuit to realize this function is called AGC loop. AGC loop is a closed-loop electronic circuit and a negative feedback system. It can be divided into two […]

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What are the main parameters of integrated operational amplifier

The main parameters of the integrated operational amplifier are as follows: (1) Input offset voltage UOS A DC compensation voltage is applied to the two input terminals of the operational amplifier to make the output of the amplifier zero potential. In addition, the compensation voltage is the input offset voltage UOS. (2) Input offset voltage […]

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