Bridge pressure sensor output signal acquisition and amplification
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Bridge pressure sensor output signal acquisition and amplification
There is a pressure sensor that outputs a signal of 0.1-1.5mv (specifications are shown in the figure). I need to collect and amplify this mV signal. Is there any suitable chip you can recommend?
MCU + built-in remote amplifier + 24-bit ADC + Bluetooth chip (similar to the Bluetooth bracelet SOC chip, which can collect some physical quantities, such as ECG, blood sample, blood pressure, sleep, mood monitoring, etc.; it also has Bluetooth function; it needs a serial port, but does not need a screen driver); because the signal is too weak, pay special attention to the chip signal-to-noise ratio, DC bias, and Bluetooth low power consumption;
The size of the PCB board is only about the size of a thumbnail (18*20mm), so the chip integration should be high and the volume should be small; to amplify the weak differential signal collected by AD, should we use the chip of the electronic scale used to weigh gold? The signal is too small!
At present, the battery capacity of the board is 20-30mAh, and the board system is powered by a lithium battery 3.7-4.2V stepped down to 3.3V (do I need to add a reference chip such as TL431 to power the chip); what else should be paid attention to in the acquisition and amplification of such weak signals, in addition to stable power supply, high signal-to-noise ratio, and small DC bias? Is it necessary to use a 24-bit ADC? If there is a suitable chip solution, please recommend it!
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