The trend of the development and application of instrumentation amplifier is analysed

Abstract: the trend of the development and application of instrumentation amplifier is analysed information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. With the rapid development of electronic technology, operational amplifier circuit is widely used, and as a kind of precision difference voltage amplifier, instrumentation amplifier application scenarios in the field of electronic technology is also increasingly rich. Instrumentation amplifier is a kind of high gain, dc. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a trend of the development and application of instrumentation amplifier is analysed article details. With the rapid development of electronic technology, operational amplifier circuit is widely used, and as a kind of precision difference voltage amplifier, instrumentation amplifier application scenarios in the field of electronic technology is also increasingly rich. Instrumentation amplifier is a kind of high gain, dc amplifier, it has a differential input and single output, high input impedance and high common mode rejection ratio etc, suitable for various application domains such as pressure or temperature measurement. Its main functions include signal amplification and impedance adapter. Using differential small signal superimposed on larger common-mode signal features, instrumentation amplifier common mode signal which can be removed, and at the same time the difference signal amplification. The key parameter is the common mode rejection ratio, the performance can be used to measure the ratio of the differential gain and modulus decay. In many cases, the instrumentation amplifier has the reference input pin. On the reference pin increase will make the output voltage signal increases the same voltage. So you can simply adjust the output of the instrumentation amplifier precisely to the ADC input level, we needed to use complete input range of the ADC, at the same time improve the resolution. In the case of high common mode signal, another advantage is a very good common-mode rejection ratio and high precision. Design engineer in the use of them, however, often can appear inappropriate use. In particular, although modern instrumentation amplifier has excellent common-mode rejection CMR, but the design engineer must limit the total mode voltage and the voltage signal, in order to avoid the internal input buffer amplifier saturation. However, the design engineer often ignore this request. The common application problem is caused by the following factors: drive the benchmark end of the instrumentation amplifier with high impedance source; In the case of a high gain, low supply voltage operation instrumentation amplifier circuit; Instrumentation amplifier input and the exchange coupling, but did not provide dc return path to the ground; Using RC input coupling components don't match. Meet the different needs of different topology structure of the instrumentation amplifier the internal architecture of each are not identical, depending on the instrument amplifier zui application goal and intended use. Each structure has its own advantages and disadvantages compared to the other architecture. For example, the traditional three op-amp instrumentation amplifier will limit the common-mode voltage range, therefore not suitable for grounding sensing applications. And the common mode rejection ratio ( CMRR) Restricted by resistor matching requirements. Current feedback topology structure, on the other hand, provide the CMRR has nothing to do with the resistor is not matching, it can have grounding sensing function, without having to increase the charge pump may produce a lot of noise. Combined with the technique of automatic zero and chopping current feedback topology structure, on the need for accurate measurement of application field has much advantage. Instrumentation amplifier quickstart instrumentation amplifier is a infinite loop gain of the differential input and single output circuit block. Instrumentation amplifier and a reference input, so that users can be carried out on the output voltage up or down the level of displacement, 水平, 转变) 。 Users can also be one or more of the internal or external resistor to set the gain. Instrumentation amplifier with operational amplifiers for many applications, from the background noise, hum, or dc offset voltage extract weak signal, CMR characteristics is very important. Operational amplifier and instrumentation amplifier has some kind of CMR features. But, the instrumentation amplifier can prevent common-mode signal in the output of the amplifier. The operational amplifier, although there is also a CMR, common mode voltage (usually as a single gain 单位增益) , as the signal to the output terminal. Most of the instrumentation amplifier adopts three operational amplifier arranged into two levels: one is composed of two op-amp preamplifier, followed by a differential amplifier. Provides the high input impedance preamplifier, low noise and gain. Differential amplifier inhibit common-mode noise, but also can provide certain additional gain when needed. Since the invention, the instrumentation amplifier has experienced a long developing process, is to use two op-amp and three early zui amplifier of traditional instrumentation amplifier, or a simple differential difference amplifier ( DDA) 。 They have different topology structure, used to meet the demand of widely from a variety of different applications. The ADI * a successfully developed the monolithic integrated instrumentation amplifier.

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