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Multi-channel low-frequency signal generating and conditioning teaching experiment circuit and method

A low-frequency signal and experimental circuit technology, applied in teaching models, educational appliances, instruments, etc., can solve the problems of poor consistency of performance parameters, complex circuits, etc., and achieve the effect of improving the overall performance

Inactive Publication Date: 2017-01-11
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Need to design multiple baseband signal generator circuits
[0005] 2. Using a variety of baseband signal generation circuits, due to the differences in the circuits themselves, the consistency of performance parameters is poor
[0006] 3. In order to realize the variable frequency, waveform and amplitude of each baseband signal, the circuit is very complicated

Method used

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  • Multi-channel low-frequency signal generating and conditioning teaching experiment circuit and method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Such as figure 1 As shown, a multi-channel low-frequency signal generation and conditioning teaching experiment circuit, including:

[0024] Multi-channel arbitrary waveform generator 1 is the basis for generating multi-channel signals. It takes the output of the crystal oscillator 8 as the clock and can generate multi-channel arbitrary waveforms.

[0025] The NPN transistor 2 is used as a switch tube, and the pulse signal generated by the signal generator is converted into a TTL level.

[0026] The inverter 3, whose input terminal is connected to the collector of the NPN transistor 2, inverts and shapes the pulse signal.

[0027] The attenuator 4 is connected to an output terminal of the multi-channel arbitrary waveform generator 1 to attenuate the initial baseband signal and increase the adjustable range of the signal amplitude.

[0028] A ...

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Abstract

The invention discloses a multi-channel low-frequency signal generating and conditioning teaching experiment circuit and a method. The circuit comprises a multi-channel arbitrary waveform generator of which the output end is connected with a conditioning circuit. After a first output of the multi-channel arbitrary waveform generator is connected in series with a triode and a phase inverter, each of the other outputs of the multi-channel arbitrary waveform generator is sequentially connected in series with an attenuator, a variable-gain amplifier and a filter. The variable-gain amplifiers are connected with a multi-channel digital-to-analog converter, and the multi-channel digital-to-analog converter is connected with a principal computer. The clock input end of the multi-channel arbitrary waveform generator is connected with a crystal oscillator. Multiple frequency-adjustable, waveform-selectable and amplitude-controllable baseband signals can be generated at the same time.

Description

technical field [0001] The invention relates to the field of teaching experiment devices, in particular to a multi-channel low-frequency signal generation and conditioning teaching experiment circuit and method. Background technique [0002] In the teaching experiment activities of electronic and information engineering professional courses in colleges and universities, in order to enhance students' interest in experimental courses and the effect of teaching experiments, deepen students' understanding of the basic knowledge of modulation technology, and enable students to learn and master AM, FM, pulse modulation and It combines modulation principles and technologies to cultivate students' practical operation ability and engineering application ability. It is necessary to carry out AM, FM, pulse modulation and their combination modulation experiments. [0003] In the existing technical solutions, single amplitude modulation, frequency modulation and pulse modulation can be r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B23/18
CPCG09B23/183G09B23/186
Inventor 杨永军杨华祥郑洪义王磊张维杰
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP