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Intermediate frequency signal acquisition circuit with extensible channel number, key module and acquisition method

An intermediate frequency signal, acquisition circuit technology, applied in electrical components, analog-to-digital converters, analog-to-digital conversion and other directions, can solve the problems of high cost, long cycle and high cost

Pending Publication Date: 2021-07-09
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different systems are re-built, and the cycle is long and the cost is high; if a complete bus-type data acquisition system such as VXI and PXI is used, it is too complicated and expensive

Method used

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  • Intermediate frequency signal acquisition circuit with extensible channel number, key module and acquisition method
  • Intermediate frequency signal acquisition circuit with extensible channel number, key module and acquisition method
  • Intermediate frequency signal acquisition circuit with extensible channel number, key module and acquisition method

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specific Embodiment approach 1

[0061] The following is a specific implementation of the intermediate frequency signal acquisition circuit with expandable channel number of the present invention.

[0062] The present invention realizes the circuit realization and method construction of the intermediate frequency signal acquisition system with expandable channel number, such as figure 1 The main circuit shown is composed of a module identification unit, a common resource unit, a module configuration unit, and a data collection and transmission unit. The specific implementation is as follows.

[0063] combine figure 2 , consists of a 4-bit data comparator 74HC85, a 4-bit 4-bit DIP switch and 2 or 3 shift registers 74HC595 to form a module identification unit. This unit sets the physical address for each ADC module board through the DIP switch. When the ADC module board is connected to the MCU module board, it realizes the identification function of the ADC module board through software addressing.

[0064] ...

specific Embodiment approach 2

[0070] The following is the specific implementation of the module identification unit in the intermediate frequency signal acquisition circuit with expandable channel number of the present invention.

[0071] It should be noted that the module identification unit in this embodiment can be implemented alone, or can be used as a key module of the intermediate frequency signal acquisition circuit with an expandable channel number in the specific embodiment 1, and work in cooperation with other modules.

[0072] combine figure 2 , consists of a 4-bit data comparator 74HC85, a 4-bit 4-bit DIP switch and 2 or 3 shift registers 74HC595 to form a module identification unit. This unit sets the physical address for each ADC module board through the DIP switch. When the ADC module board is connected to the MCU module board, it realizes the identification function of the ADC module board through software addressing.

[0073] Pin 1 of DIP switch SX1 is defined as COD0 connected to +3.3V ...

specific Embodiment approach 3

[0075] The following is a specific implementation manner of the common resource unit in the intermediate frequency signal acquisition circuit with expandable channel number of the present invention.

[0076] It should be noted that the common resource unit in this embodiment can be implemented independently, or can be used as a key module of the intermediate frequency signal acquisition circuit with an expandable channel number in the specific embodiment 1, and work in cooperation with other modules.

[0077] refer to image 3It is a common resource unit, including 2 pieces of crystal oscillators 8.192M and 25M, 1 piece of reference voltage source ADR4525, 1 piece of DCDC converter, and 1 piece of linear voltage regulator 7805. As the main board, the MCU module board provides clock, reference voltage, bus, and trigger for each carried ADC module board to ensure that synchronous data transmission can be realized when the ADC module board is connected. The 25M crystal oscillato...

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Abstract

The invention discloses an intermediate frequency signal acquisition circuit with an extensible channel number, a key module and an acquisition method, and belongs to the field of signal acquisition and processing. The intermediate frequency signal acquisition circuit with the extensible channel number comprises a module identification unit, a public resource unit, a module configuration unit and a data acquisition and transmission unit; the intermediate frequency signal acquisition method with the extensible channel number comprises an intermediate frequency signal acquisition method under the condition that a single ADC module SPI acquires data and an intermediate frequency signal acquisition method under the condition that a multi-ADC module QSPI acquires data. According to the intermediate frequency signal acquisition system circuit, information interaction between one MCU module board and at most 8 ADC module boards is realized through module configuration and module identification, and the number of channels is within 64. A bus is directly connected with an MCU (Microprogrammed Control Unit); wherein the MCU module board provides resources for each ADC module board; a logic control method with SPI communication as a main part and double QSPI communication as a slave part is adopted, and therefore, synchronous acquisition of multiple channels can be realized, and each channel can keep working independence.

Description

technical field [0001] The intermediate frequency signal acquisition circuit, the key module and the acquisition method of the present invention, which can expand the number of channels, belong to the field of signal acquisition and processing. Background technique [0002] Mechanical vibrations are ubiquitous in nature, and we can obtain a lot of useful information through the observation of mechanical vibrations. The mechanical vibration can be sampled to find its physical law, so as to monitor the vibration of the measured target, find the law and use the found physical law. For example, earthquake prediction can be realized through the monitoring of seismic waves, performance monitoring can be achieved through the acquisition of vibration signals of aerospace equipment, and bridge safety monitoring can be realized through the acquisition of bridge vibration signals. Therefore, it is essential to collect the intermediate frequency vibration signal through the sensor to r...

Claims

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Application Information

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IPC IPC(8): H03M1/12
CPCH03M1/129
Inventor 童子权胡睿辰任丽军杨茹郎春煜刘卓
Owner HARBIN UNIV OF SCI & TECH