KR19980030937A - Input signal processing device of general trigger board - Google Patents

Abstract

The present invention relates to an input signal processing apparatus of a general trigger board.

The input signal processing apparatus of the general trigger board of the present invention is connected to a personal computer 70 through a PC interface 60, and processes an input signal under the control of the personal computer 70 to process the A / D conversion device ( 20) and the trigger comparator 30, and in the general trigger board for integrating the AD board and the trigger board into a single, in the PC environment, to convert the input signal to the AD board and the trigger board to build an integrated conversion By supplying the device within the signal processing range of the device, the AD board and the trigger board operating in the PC environment can be modularized.

Description

Input signal processing device of general trigger board

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input signal processing apparatus of a general trigger board. In particular, in a general trigger board, for integrating an AD board and a trigger board, a general trigger for processing an input signal to be supplied within a signal processing range of an AD converter. An input signal processing apparatus for a board.

In general, the use of high speed waveform measurement AD board is essential in waveform inspection equipment and automatic adjustment equipment that require high speed signal processing. Although the use of high-speed waveform measurement technology is already common, the development of high-speed signal processing and transmission on the PCB, the burden on the effective display has not been attempted in Korea until recently. However, considering that the measurement systems are being built into the PC environment and the modularization of the measurement system is rapidly progressing, the technological shift to this trend is an urgent factor.

Due to the recent increase in demand for inspection equipment, methods that temporarily used oscilloscopes are already degenerating, and high-speed AD boards and trigger boards that can be operated in PC environments are already developed for the development of effective and inexpensive measurement modules. Is becoming commonplace.

However, in the related art, in addition to the recent trend, the development of the technology for integrating the AD board and the trigger board into one is being accelerated. There is a problem that there is no input signal processing device of the trigger board to integrate the trigger board.

The present invention has been made to solve the above problems and to achieve an improvement.

Accordingly, an object of the present invention is to operate in a PC environment by processing the input signal to be supplied within the signal processing range of the AD converter for general construction of the AD board and the trigger board in the PC environment. It is to provide input signal processing device of general trigger board that enables modularization of AD board and trigger board.

As a technical means for achieving the above object of the present invention, the input signal processing apparatus of the general trigger board of the present invention is connected to a personal computer through a PC interface, and processes the input signal under the control of the personal computer An input signal processing apparatus for providing an A / D converter and a trigger comparator and integrating an AD board and a trigger board into a single probe, the probe for selecting a probe according to an input signal size under the control of the personal computer. A selection unit; An input coupling selection unit for determining a coupling to a signal from the probe selecting unit under the control of the personal computer; A first attenuation rate selection unit for firstly attenuating a signal from the input coupling selection unit under control of the personal computer; A first buffer matching an impedance between the first attenuation rate selection unit and a next circuit block; A secondary attenuation rate selection unit configured to secondaryly attenuate a signal through the first buffer under the control of the personal computer; A first amplification ratio selecting unit for first amplifying a signal from the input coupling selecting unit under the control of the personal computer; A second amplification ratio selecting unit for secondly amplifying a signal through the first amplification ratio selecting unit under the control of the personal computer; And a second buffer matching the impedance between the secondary attenuation selector and the next circuit block and the secondary amplification selector and the next circuit block.

1 is a block diagram showing a configuration for a general trigger board according to the present invention,

2 is a block diagram of the input signal processing apparatus 10 of the general trigger board according to the present invention.

Explanation of symbols on the main parts of the drawings

10: input signal processing device 11: probe selection unit

12: input coupling selector 13: primary attenuation rate selector

14: first buffer 15: secondary attenuation rate selection unit

16: primary amplification selector 17: secondary amplification selector

18: second buffer 18: second amplification selector

20: A / D converter 30: trigger comparator

40: timebase trigger logic 50: memory

60: PC interface 70: personal computer

80: key input device

Hereinafter, a preferred embodiment of an input signal processing apparatus of a general trigger board according to the present invention will be described with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

1 is a block diagram showing a configuration of a general trigger board according to the present invention. Referring to FIG. 1, the general trigger board of the present invention determines whether an input signal is coupled or not and inputs an input signal under measurement. An input signal processing apparatus 10 for properly amplifying or attenuating, an A / D converter 20 for converting an analog signal from the input signal processing apparatus 10 into a digital signal, and the input signal processing apparatus 10 The trigger comparison device 30 determines and outputs a trigger position with respect to the signal from the signal, and the sampling rate of the ADC to display one or more cycles of each signal according to the frequency of various signals of the trigger comparison device 30. PC which connects the time base trigger logic 40 to change, the memory 50 storing the AD signal converted by the A / D converter 20, and the circuits and the personal computer 70. Interface (60) It is composed of a personal computer 70 for controlling the integrated board from the ADC board and trigger board via the PC interface 60.

2 is a block diagram of the input signal processing apparatus 10 of the general trigger board according to the present invention. Referring to FIG. 2, the input signal processing apparatus 10 of the general trigger board is the personal computer 70. According to the control of the probe, the probe selection unit 11 for selecting the probe (1: 1 or 10: 1) according to the input signal size, and the probe selection unit 11 under the control of the personal computer 70 A first attenuation rate for firstly attenuating the signal from the input coupling selection unit 12 under the control of the personal computer 70 and the input coupling selection unit 12 for determining the coupling to the signal from Under the control of the personal computer 70, the first buffer 14 matching the impedance between the selector 13, the primary decay rate selector 13 and the next circuit block, and the first buffer 14 And a secondary attenuation rate selection unit 15 for secondaryly attenuating the signal through the first and second personal computer 70. According to the control of the primary amplification ratio selector 16 for amplifying the signal from the input coupling selector 12 and the personal computer 70, the primary amplification selector ( 16, a secondary amplification selector 17 for amplifying the signal through the secondary, the secondary attenuation selector 15, the next circuit block, and the second amplification selector 17 and then A second buffer 18 for matching impedance between circuit blocks;

Operation according to the device of the present invention configured as described above will be described in detail below based on the accompanying drawings.

In the personal computer 70 shown in FIG. 1, the personal computer 70 inputs the type of signal to be processed through the key input device 80 and the processing specification according to the type into the personal computer 70. According to the input information from the key input device 80, the input signal processing device in the general trigger board is controlled through the PC interface 60 to operate as follows.

Referring to FIG. 2, first, the input signal processing apparatus 10 of the present invention uses an AC / DC / GND selection stage (input coupling selection unit) for determining whether an input signal is coupled or not, and an input signal to be measured. It consists of a signal conversion block (atten. Amp; 13, 15, 16, 17) to amplify or attenuate properly. This device is used to determine the scale per one division of the grid to be used as the index of the waveform to be displayed on the output screen.

In the probe selection unit 11 of the input signal processing apparatus 10 of the present invention, the input probe is selected according to the magnitude of the input signal under the control of the personal computer 70, and the signal type (AC / The input coupling selector 12 combines and outputs the input signals according to DC / GND).

The combined signal is selectively attenuated or amplified under the control of the personal computer 70. When the personal computer 70 commands the attenuation operation, the primary attenuation rate selection unit 13 and the secondary attenuation rate selection are performed. The unit 15 is operated so that the signal is attenuated at a predetermined ratio by the primary and secondary attenuation selectors 13 and 15 and then output through the second buffer 18.

When the personal computer 70 instructs the amplification operation, the primary amplification selector 16 and the secondary amplification selector 17 operate, so that the signal is the primary and secondary amplification selector. Amplified at a predetermined ratio at (16, 17), and then output through the second buffer 18.

Meanwhile, the input grid scale and the signal attenuation or amplification factor at each scale according to the present invention are shown in Table 1 below.

V / DIV at least maximum ATT AMP 5 mV 0.1569 mV 40 mV 25 10 mV 0.3137mV 80 mV 12.5 20 mV 0.6257 mV 160 mV 6.25 50 mV 1.569 mV 400 mV 2.5 0.1 V 3.137 mV 0.8 mV 1.25 0.2 V 6.257 mV 1.6 mV 0.5 0.5 V 15.69 mV 4V 0.2 1 V 3.137 mV 8V 0.1 2 V 6.257 mV 16 V 0.05 5 V 15.69 mV 40 V 0.02 10 V 31.37 mV 80 V 0.01

In the present invention, the attenuation of the signal attenuates the input signal using a resistor which is basically a passive element. In this case, since the frequency of the input signal is in the range of DC to several tens of MHz, frequency compensation is performed by using a reactance of a capacitor. In addition, the amplification of the signal is configured using an OP amplifier (Amp) and designed so that the amplified or attenuated signal does not exceed the analog input range of the ADC does not exceed 2Vp-p at the scale of the range. The switching of each internal signal conversion path basically used a relay.

According to the present invention as described above, in the general trigger board, by processing the AD board and the trigger board in the PC environment to supply the input signal within the signal processing range of the AD converter for the integrated construction, in the PC environment There is a special effect that enables modularization of the working AD board and trigger board.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration. In addition, those skilled in the art will readily recognize that the input signal processing apparatus of the general trigger board is not limited to the above-described embodiment.

Claims (1)

It is connected to the personal computer 70 through the PC interface 60, and processes the input signal under the control of the personal computer 70 and provides it to the A / D converter 20 and the trigger comparator 30. In the input signal processing device for integrating the AD board and the trigger board into one, A probe selector 11 for selecting a probe according to an input signal size according to the control of the personal computer 70; An input coupling selection unit 12 for determining a coupling to a signal from the probe selecting unit 11 under the control of the personal computer 70; A primary decay rate selector (13) which primarily attenuates the signal from the input coupling selector (12) under the control of the personal computer (70); A first buffer 14 matching an impedance between the first attenuation rate selection unit 13 and a next circuit block; A secondary attenuation rate selection unit 15 for secondaryly attenuating a signal through the first buffer 14 under the control of the personal computer 70; A primary amplification ratio selecting section (16) for first amplifying the signal from the input coupling selecting section (12) under control of the personal computer (70); A secondary amplification selector 17 for secondly amplifying a signal through the primary amplification selector 16 under control of the personal computer 70; And a second buffer (18) for matching the impedance between the secondary attenuation selector (15) and the next circuit block and the secondary amplification rate selector (17) and the next circuit block. Input signal processing device of trigger board.