Receive circuit capable of accepting an ultra-wide common-mode input voltage range

Abstract

The invention discloses a receiving circuit capable of receiving ultra-wide common-mode input voltage. The receiving circuit comprises a resistor set, a reference amplifier, a first input amplifier set, a second input amplifier set and an analog adder, which are electrically connected to the high end and the low end of a CAN; therefore, voltage of the high end and the low end is received; after the voltage is reduced through the resistor set, partial voltage of high-end voltage generated by a first node and partial voltage of low-end voltage generated by a second node are output to the first input amplifier set and the second input amplifier set; the first and second input amplifier sets have the capability of amplifying differential signals between the first node and the second node and converting the differential signals into single-ended signals; and output signals can be obtained by adding the signal through the analog adder. The receiving circuit disclosed by the invention can receive the differential signals in an extremely large or extremely small common-mode range and reduce the electromagnetic scattering degree.

Description

technical field [0001] The invention relates to a receiving circuit of a controller area network (Controller Area Network, CAN), in particular to a receiving circuit capable of receiving a common-mode input voltage between extremely large or extremely small ranges and capable of receiving an ultra-wide common-mode input voltage range . Background technique [0002] Controller Area Network (CAN), issued by the International Organization for Standardization (ISO) (ISO-11898), was originally a communication system developed by European car manufacturers to solve the problem of transmitting information in European cars in extremely harsh environments. Multiple controllers or computers are integrated in the network, and each computer shares and shares information to achieve the required functions. CAN can provide quite stable signal transmission under harsh or unstable electrical conditions. It is often used in various In the control system of this kind of vehicle, CAN uses the ...

AI Technical Summary

Problems solved by technology

In the actual manufacturing of chips, each resistance value is easy to deviate from the design value, and the common-mode voltage level on the CAN network in the recessive state (Recessive State) will deviate from the transmitter output to CAN in the dominant state (Dominant State). Common mode voltage level on the network

During data transmission, the common-mode signal on the CAN network has high-frequency disturbances, which can easily increase the degree of Electromagnetic Emission (EME)

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