Is the pressure sensor I can only produce 0-5mV signal, I want to enlarge it, but when I connect the pressure sensor and the amplifier, not to pressure, there are large fluctuations in output, when I give the pressure, but the signal can magnify the volatility is quite large, how to solve?
The signal from the sensor out of the first stage you into the follower, why the first to follow, I suggest you take the first withdrawal. Don't follow the signal of pressure sensor out of the long line, you are using a wire shielding line? No shielding line you want to use the shielded wire, shielding wire shielding layer one end is connected with the DC power amplifier. You use level two, electric block 20K/10K, each 22 times. If I said it is not feasible, changed. If not, I think the amplifier should also be performed, increase the zoom resistance ratio increase, the resistance of 220K and 10K with a reduced resistance. An amplifier.
The power supply you use is the switching power supply of the DCDC module or the linear power supply. Sometimes, the power quality will have obvious clutter. The input and output of the amplifier can be added with a decoupling capacitor. The VCC and VEE can be connected to each other and an electrolytic capacitor.In addition, you say that the output fluctuations, how big fluctuations, if the follow-up signal processing is done with single-chip, and so on, you can deal with the software.
May be the pressure sensor product performance is not pass, 0 points unstable, elegant and large!If the pressure sensor is OK, it can be adjusted and can be adjusted on the transmitter!!!
