Multi-channel isolation and program-controlled analog signal source system

Abstract

The invention discloses a multi-channel isolation and program-controlled analog signal source system. The multi-channel isolation and program-controlled analog signal source system is characterized in that an FPGA (Field Programmable Gate Array) chip is used as a master control CPU (Central Processing Unit) for controlling an external DA (Digital / Analog) conversion circuit, a filtering and amplifying circuit, a multi-channel relay switching circuit, a magnetic coupling isolation circuit and an RS485 communication circuit; an external 12-bit high-precision chip is used for converting a waveform amplitude in a digital quantity form into a signal with required synthesis frequency in an analog quantity form; the signal is amplified by an amplitude of a differential amplification circuit and then the amplified signal enters a rear-end filtering and amplifying circuit; the signal is subjected to clutter removal and further conditioning and amplifying to obtain a single-channel analog excitation signal meeting design demands; finally, the analog signal selects one or more channels of signals for simultaneously outputting in parallel through a multi-channel relay. The multi-channel isolation and program-controlled analog signal source system disclosed by the invention is based on an embedded real-time operation system, is program-controlled by software written under the C# compiling environment, and integrates the functions that the multi-channel analog signals are output in an isolation parallel manner, signal waveform, the amplitude, the frequency and duty cycle can be adjusted and the like.

Description

technical field [0001] The present invention is an analog signal source generating system designed and realized based on the combination of the FPGA technical field and the C# programming environment, belongs to the FPGA application technical field, and is applicable to the telemetry calibration technical field, the military radar application field, and the automatic test system field. Background technique [0002] The program-controlled analog signal source is an important part of the automatic test system, which is used to provide the excitation signal for the automatic test system to the module under test. As a basic electronic device, the analog signal source is widely used in the field of telemetry calibration technology and military radar application. With the development of science and technology and the progress of measurement technology, the requirements for analog signal sources are getting higher and higher, and ordinary signal generators can no longer meet the ne...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of less analog signal states and lower precision in the current test equipment, a multi-channel isolated program-controlled analog signal source system was invented. This system can generate 128 channels of electrically isolated program-controlled signals, and output them simultaneously through one or more channels of the switch matrix. , the signal accuracy reaches 0.2% FS

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