AD switching circuit

A conversion circuit, the technology of AD7606, applied in the field of AD conversion, can solve the problem that the signal is easily affected by the quality characteristics of resistance, capacitance and operational amplifier, and the resolution is low, so as to improve the resolution, not be affected by external factors, and have high resolution Effect

Inactive Publication Date: 2015-03-25
ANHUI XINLONG ELECTRICAL
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] 1. Before the sampled signal enters the op amp, it must be filtered by two stages of RC, and then isolated and amplified by the op amp. In this way, the sampled signal is easily affected by the quality characteristics of the resistance, capacitance and op amp.
[0005] 2. MAX1320ECM provides 8 channels of analog signals to be converted into 14-bit digital values ​​synchronously, and the resolution after conversion is low

Method used

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Embodiment Construction

[0025] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0026] The current 8-channel AD synchronous conversion circuit is filtered by two-stage RC, then isolated and amplified, and then synchronous AD conversion is sent to the FPGA. The circuit diagram is shown in Figure 1 ~ Figure 4 . It can be seen that the sampled signal needs to be filtered by two stages of RC before entering the op amp, and then isolated and amplified by the op amp. In this way, the sampled signal is easily affected by the quality characteristics of the op amp. The resolution of the converted MAX1320ECM is 14 bit, the resolution is smaller.

[0027] The present invention replaces the RC filter circuit with AD7606, the operational amplifier isolation circuit and the synchronous conversion circuit of MAX1320ECM, and the signal that needs to be collected and converted is f...

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Abstract

The invention relates to an AD switching circuit. According to the AD switching circuit, an AD7606 chip is used for replacing an operational amplifier circuit and a MAX1320ECM. An analog signal needing to be switched is subjected to two-stage RC filtering and then is connected into eight paths of analog input pins of the AD7606 chip, eight paths of the analog signal are synchronously converted into a digital signal with the 16-bit resolution ratio through the chip, and then the 16-bit digital signal is connected into an FPGA. The AD7606 chip is provided with an input buffer with a 1M omega input impedor and a second-order anti-aliasing analog filter, an analog input clamp protection function is achieved, a 16-bit digital output port is formed, and the AD switching resolution ratio is improved.

Description

technical field [0001] The invention relates to the AD conversion technology in the main control of SVG, in particular to a technology for multi-channel synchronous sampling and synchronous conversion using AD7606. Background technique [0002] Most of the AD conversion in the main control of the current 10KV SVG project uses the op amp TL064C chip to isolate and amplify the sampling signal, and then uses the MAX1320ECM to perform AD conversion on the isolated and amplified signal, and then converts The final digital signal is sent to the FPGA. [0003] This method of sampling conversion has the following disadvantages: [0004] 1. Before the sampled signal enters the op amp, it must be filtered by two stages of RC, and then isolated and amplified by the op amp. In this way, the sampled signal is easily affected by the quality characteristics of the resistance, capacitance and op amp. [0005] 2. MAX1320ECM provides 8 analog signals to be converted into 14-bit digital sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 束龙胜刘建文杨振杨艳汪霞
Owner ANHUI XINLONG ELECTRICAL
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