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According to different working frequencies, the semiconductor components with low noise are reasonably selected in the low frequency band, and the transistors have large noise due to problems such as barrier capacitance and diffusion capacitance. Since the junction field effect transistor is a majority carrier, the current non-uniformity of the barrier region does not exist. Moreover, the reverse current between the gate and the conductive trench is small, and the generated shot noise is small. Therefore, the field effect transistor should be used in the middle and low frequency pre-stage circuits, which can not only reduce the noise but also have a higher input impedance. In addition, if it is necessary to replace a semiconductor component such as a transistor, it must be compared and selected, even if the parameters of the semiconductor device of the same type are different. Similarly, the noise resistance of the carbon film resistor and the metal film resistor in the circuit is also different. The noise of the metal film resistor is smaller than that of the carbon film, especially when the small signal input of the front stage is used, a metal film with low noise can be considered. resistance.
Select an appropriate amplifier circuit according to different working frequency bands and parameters
Choosing the appropriate amplifying circuit not only has a direct impact on the circuit of this stage, but also has an important influence on the operating parameters and working state of the whole circuit. When the cascode configuration is connected, the circuit has a higher amplification gain, and its noise has less influence on the latter stage. In the case of a common configuration, there is a higher input impedance and a better frequency response. Therefore, according to different circuits, the parameters should have different requirements. Choosing a good circuit can not only simplify the circuit structure, but also reduce the interference of noise on the whole circuit. Under the conditions allowed by the circuit performance parameters, digital circuits with better anti-interference ability should be used as much as possible.
Through the above understanding, I learned how they work and found the sensor noise that affects people's lives. We can now rationally choose and deal with the greatest possible reduction in our lives. In order to change our way of life, we have made significant improvements.
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