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Four questions designed sensor is to be noted
Design of the sensor is very complicated, the sensor is a general understanding of the physical quantity into a can in another intuitive description of the physical quantity can be expressed through circuit switching. Today small to introduce the four main issues to be noted that the sensor design, hope can help to you.
1, commonly measured physical quantity is very small, usually with a sensor element inherent physical conversion conversion noise. For example, the sensor is at a magnification of the signal strength is 0.1 ~ 1uV, background noise signal at this time there are such a big level, and even to its annihilation. How to try to remove the useful signal and suppress noise sensor design is the primary problem.
2, the sensor circuit must be simple refining. Imagine having three amplifier circuit with two active filter amplifier circuit, amplifies the signal and also amplify the noise, if the noise is not apparent deviation from the desired signal spectrum, regardless of how filtering both amplification results SNR does not improve. Therefore, the sensor circuit must be refined simplicity. You can save a resistor or capacitor to be sure to remove it. This is a lot of sensor design engineers easy to overlook the problem. Is known is that the sensor circuit with noise problems plagued the modification circuit more complex, becoming the cycle.
3, power consumption. Sensors are usually at the front end of the follow-up circuit, it may require longer lead connections. When a large power consumption when the sensor connection will lead all unnecessary noise and power supply noise is introduced so that subsequent circuit increasingly difficult to design. In the case of small enough how to reduce power consumption is not a small challenge.
4, the selection of components and power supply circuit. Choice of components must be good enough for the good, as long as the device is within the range of indicators need of it, the rest is a circuit design problems. Power is the problem sensor circuit design process must be met, not the pursuit of unattainable power indicator, and the choice of having a better common mode rejection ratio of the operational amplifier, differential amplifier design may be the most common switching power supply and the device will be able to meet your requirements. Power supply decoupling must be reliable design, and follow the requirements of the manual device, rather more not less.

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