High-precision small-signal measurement system with adaptively selected magnification times
A technology of self-adaptive selection and magnification, which is applied in the field of signal measurement, can solve the problems of low measurement accuracy of small signals, and achieve the effects of improving accuracy, reducing noise, improving adjustability and anti-interference ability
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Embodiment 1
[0022] combined with figure 1 As shown, a high-precision small-signal measurement system with adaptive selection of magnification includes: a signal input interface, a buffer module, an analog-to-digital converter and a single-chip microcomputer connected in sequence, the analog-to-digital converter has a programmable amplifier inside, and also It includes a power supply module for supplying power to the signal input interface, buffer module, analog-to-digital converter and single-chip microcomputer.
[0023] The power supply module provides the working voltage of the single-chip microcomputer, the analog-to-digital converter and the buffer module. The single-chip microcomputer and the analog-to-digital converter are connected through SPI communication. The single-chip microcomputer first sets the initial magnification of the analog-to-digital converter to 1, and the measured signal is input from the signal input interface. After filtering and noise reduction by the buffer mod...
Embodiment 2
[0025] On the basis of Example 1, combined with the attached figure 1 As shown, the single-chip microcomputer adopts STM32F103CBT6, the buffer adopts the rail-to-rail input and output buffer AD8607, the analog-to-digital converter adopts the chip AD7710, the first linear regulator and the second linear regulator of the power supply module, the first linear regulator, A low-noise linear regulator ADP7104-3.3 is used to convert the input 9V DC power supply into a 3.3V DC power supply to supply power to the microcontroller. The second linear regulator uses a low-noise linear regulator ADP7104-5.0, which is used to convert the input The 9V DC power supply is converted into 5V DC power supply to supply power to the buffer and the analog-to-digital converter. The microcontroller and the analog-to-digital converter are connected through SPI communication, which can set the internal registers of the analog-to-digital converter and read the conversion data of the measured signal, low no...
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