CN102411078A - Portable digital storage oscilloscope (DSO) based on FPGA (Field-Programmable Gate Array) - Google Patents

Abstract

The invention provides a portable digital storage oscilloscope (DSO) based on an FPGA (Field-Programmable Gate Array), and belongs to the field of instruments and meters. The portable DSO comprises a keyboard, an FPGA module, an operational amplification module, an analog-to-digital converter (ADC) and a VGA display, wherein, the FPGA module comprises a VGA (Video Graphics Array) display control module, a keyboard control module, a time control module, a sampling module, a clock signal generation module and a dual-port memory, wherein, the time control module is respectively connected with the keyboard control module, the sampling module, the clock signal generation module and the dual-port memory, and the dual-port memory is respectively connected with the VGA display control module and the sampling module; the output terminal of the operational amplification module is connected with the input terminal of the ADC; the output terminal of the ADC is connected with the sampling module in the FPGA module; the VGA display is connected with the VGA display control module in the FPGA module; and the keyboard is connected with the keyboard control module in the FPGA module. The portable DSO provided by the invention has the advantages that the cost is low, and the volume is small; and meanwhile system reliability can be ensured by processing signals in the FPGA.

Description

A kind of portable digital storage oscilloscope based on FPGA

Technical field

The present invention is a kind of portable digital storage oscilloscope based on FPGA, belongs to instrument field.

Background technology

Digital storage oscilloscope is widely used in each field tests as the technological important tool of on-the-spot test.But because desk-top digital oscilloscope volume is too huge, is inconvenient to carry and carries out on-the-spot test and field work, can not satisfy the people's work needs, so the portable digital oscillograph has had the certain development space.At present, external portable digital oscillograph occupies dominant position on market, and domestic research starts to walk than later, and is mostly low-end product on the market, and costs an arm and a leg.The patent that the patent No. is 200610155604.9, name is called " a kind of portable universal digital storage oscillograph " promptly belongs to these row.

Summary of the invention

Portable not enough to product on the market; The situation that cost performance is low; The invention provides a kind of portable digital storage oscilloscope based on FPGA, signal Processing etc. all is placed on FPGA inside handles, external circuit is amplifier and analog and digital signal converter only; Be equipped with the VGA display again and form oscillograph, with the purpose that reaches with low cost, volume is little, FPGA inter-process signal can guarantee the reliability of system.

The present invention realizes in the following manner:

A kind of portable digital storage oscilloscope based on FPGA; Comprise keyboard, computing amplification module, analog to digital converter, VGA display and FPGA module; It is characterized in that the FPGA module comprises VGA display control module, Keyboard Control module, time control module, sampling module, clock signal generating module and dual-ported memory; Time control module is connected with Keyboard Control module, sampling module, clock signal generating module and dual-ported memory respectively, and dual-ported memory is connected with VGA display control module, sampling module respectively; The input end of computing amplification module output terminal and analog to digital converter is connected; The output terminal of analog to digital converter is connected with sampling module in the FPGA module; The VGA display is connected with VGA display control module in the FPGA module, and keyboard is connected with Keyboard Control module in the FPGA module.

Above-mentioned FPGA (Field-Programmable Gate Array), i.e. field programmable gate array.

Above-mentioned VGA (Video Graphics Array) is a kind of video transmission standard that IBM released with the PS/2 machine in 1987, has Resolution is high, show advantages such as speed is fast, color is abundant, at colour DisplayThe field has obtained using widely.

The method of work of above-mentioned a kind of portable digital storage oscilloscope based on FPGA, step is following:

A. with oscillographic power connection, with the simulating signal that will measure be input to the input end of computing amplification module, the enlargement factor of regulating the computing amplification module makes it can satisfy the voltage magnitude requirement on the VGA display, the analog to digital converter sampling;

B. the signal input analog-to-digital converter after amplifying carries out the conversion of simulating signal to digital signal, then digital signal is sent into the sampling module of FPGA inside modules;

The sampling module of c.FPGA inside modules is sampled to the digital signal of sending into, and sampling rate is controlled by time control module, and the control clock of time control module is produced by clock signal generating module;

D. the data that obtain of sampling are deposited in dual-ported memory in the FPGA inside modules;

The e.VGA display control module from the dual-ported memory reading of data and on the VGA display display waveform and data;

F. the Keyboard Control module is carried out the indirect control of sampling rate according to keyboard input to time control module, thereby makes the waveform of oscillograph clear display.

Wherein, oscillographic waveform indication range is adjustable, and by the FPGA internal control, base and amplitude are all adjustable during demonstration.

Advantage of the present invention is: reliability with low cost, that volume is little, FPGA inter-process signal can guarantee system.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Wherein: 1, computing amplification module, 2, analog to digital converter, 3, the VGA display, 4, keyboard; 5, FPGA module, 6, the VGA display control module, 7, the Keyboard Control module, 8, time control module; 9, sampling module, 10, clock signal generating module, 11, dual-ported memory.

Fig. 2 is the circuit diagram of the analog to digital converter among the present invention.P4 is header8*2 among the figure, is a 8*2 hectometre pin

Connector, wherein 1 of P4,3,5,7,9,11,13,15 link to each other with the FPGA module, and 2,4,6,8,10,12,14,16 link to each other with modulus conversion chip; P5 is 2 pin connectors, and 1 pin of P5 links to each other with the FPGA module, the CLK of 2 pin and modulus conversion chip link to each other (as shown in the figure); 17 pin Ain of modulus conversion chip connect the computing amplification module; 11,19 pin connect the 5V power supply, and 13,14 pin connect the 2.5V power supply after connecting a 1K resistance separately, and 15,16 foot meridian capacitor C6 link to each other with ground; 1,12,18 pin ground connection, 20 pin connect the 3V power supply.Modulus conversion chip model in the analog to digital converter of the present invention is ADS830e.

Fig. 3 is the FB(flow block) of the inventive method; Wherein a-f is its each step.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described further, but is not limited thereto.

Embodiment 1:

A kind of portable digital storage oscilloscope based on FPGA; Shown in Fig. 1-2; Comprise keyboard 4, computing amplification module 1, analog to digital converter 2, VGA display 3 and FPGA module 5; It is characterized in that FPGA module 5 comprises VGA display control module 6, Keyboard Control module 7, time control module 8, sampling module 9, clock signal generating module 10 and dual-ported memory 11; Time control module 8 is connected with Keyboard Control module 7, sampling module 9, clock signal generating module 10 and dual-ported memory 11 respectively, and dual-ported memory 11 is connected with VGA display control module 6, sampling module 9 respectively; The input end of computing amplification module 1 output terminal and analog to digital converter 2 is connected; The output terminal of analog to digital converter 2 is connected with sampling module 9 in the FPGA module 5; VGA display 3 is connected with VGA display control module 6 in the FPGA module 5, and keyboard 4 is connected with Keyboard Control module 7 in the FPGA module 5.

It is Xilinx Spartan-3E that the present invention adopts model, and the FPGA of 500K is used as the master control of equipment, is used for peripheral hardware control and high speed signal and handles.The signal amplifying and conditioning circuit that adopts NE5532 to form is used as the pre-service of signal in early stage, and the analog-digital converter through the FPGA clock control becomes digital signal with analog signal conversion again.Signal after will reading through the inner logic control of FPGA after this deposits inner dual-ported memory in, the waveform of the VGA of vga controller control simultaneously display shows signal.

The computing amplification module model that the present invention adopts is NE5532; VGA display model is S23A700D.

Embodiment 2:

The method of work of above-mentioned a kind of portable digital storage oscilloscope based on FPGA, as shown in Figure 3, step is following:

A. with oscillographic power connection, with the simulating signal that will measure be input to the input end of computing amplification module, the enlargement factor of regulating the computing amplification module makes it can satisfy the voltage magnitude requirement on the VGA display, the analog to digital converter sampling;

B. the signal input analog-to-digital converter after amplifying carries out the conversion of simulating signal to digital signal, then digital signal is sent into the sampling module of FPGA inside modules;

The sampling module of c.FPGA inside modules is sampled to the digital signal of sending into, and sampling rate is controlled by time control module, and the control clock of time control module is produced by clock signal generating module;

D. the data that obtain of sampling are deposited in dual-ported memory in the FPGA inside modules;

The e.VGA display control module from the dual-ported memory reading of data and on the VGA display display waveform and data;

F. the Keyboard Control module is carried out the indirect control of sampling rate according to keyboard input to time control module, thereby makes the waveform of oscillograph clear display.

Claims (2)

1. portable digital storage oscilloscope based on FPGA; Comprise keyboard, computing amplification module, analog to digital converter, VGA display and FPGA module; It is characterized in that the FPGA module comprises VGA display control module, Keyboard Control module, time control module, sampling module, clock signal generating module and dual-ported memory; Time control module is connected with Keyboard Control module, sampling module, clock signal generating module and dual-ported memory respectively, and dual-ported memory is connected with VGA display control module, sampling module respectively; The input end of computing amplification module output terminal and analog to digital converter is connected; The output terminal of analog to digital converter is connected with sampling module in the FPGA module; The VGA display is connected with VGA display control module in the FPGA module, and keyboard is connected with Keyboard Control module in the FPGA module.

2. the method for work of a kind of portable digital storage oscilloscope based on FPGA as claimed in claim 1, step is following:

A. with oscillographic power connection, with the simulating signal that will measure be input to the input end of computing amplification module, the enlargement factor of regulating the computing amplification module makes it can satisfy the voltage magnitude requirement on the VGA display, the analog to digital converter sampling;

B. the signal input analog-to-digital converter after amplifying carries out the conversion of simulating signal to digital signal, then digital signal is sent into the sampling module of FPGA inside modules;

The sampling module of c.FPGA inside modules is sampled to the digital signal of sending into, and sampling rate is controlled by time control module, and the control clock of time control module is produced by clock signal generating module;

D. the data that obtain of sampling are deposited in dual-ported memory in the FPGA inside modules;

The e.VGA display control module from the dual-ported memory reading of data and on the VGA display display waveform and data;

F. the Keyboard Control module is carried out the indirect control of sampling rate according to keyboard input to time control module, thereby makes the waveform of oscillograph clear display.

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