When a measurement system is composed of a single-chip microcomputer, the system must have an input channel for the measured electrical signal.(I .e. forward channel) , used for mining

Set the necessary input information. The design of the forward channel is closely related to the state, characteristics and environment of the measured object. Forward

Channel design should take into account the selection of sensors or sensitive components, channel structure, signal conditioning, power configuration, anti-interference design.

and many other problems.

1. Forward Channel Overview

    (1)Structure Type of Forward Channel

    In the single-chip measurement system, the electrical signal detected by the sensor usually needs to be amplified,A/D conversion,V/F Turn

In order to meet the level requirements of the input interface of the single chip microcomputer, it can be identified, received and carried out by the single chip microcomputer.

effective treatment. Therefore, the forward channel in the single-chip application system reflects the original parameters of the interrelationship between the measured object and the system.

Input channel. Since the channel is mainly a sensor and sensor-related signal conditioning, conversion circuit, it can also be called

is the sensor interface channel.

    The structure type of the forward channel depends on the type and size of the output signal of the measured object. According to the sensor output letter

The type and size of the number, the forward channel structure is shown in the figure.4-1 shown.
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