CN102353857B - Electric signal detection system - Google Patents

Abstract

The invention provides an electric signal detection system which comprises a power-up test signal wire and a shielding layer which covers the power-up test signal wire, and further comprises a charge module and a discharge module. The power-up test signal wire is connected with the shielding layer through the charge module; the power-up test signal wire and the shielding layer are electrically connected with the discharge module and grounded through the discharge module. The electric signal detection system provided by the invention has the advantages that the parasitic capacitance is removedby charging the shielding layer through the charge module; after the test, the charge in the shielding layer is led out through the discharging module to prepare for the next test, therefore the power-up detection speed is improved.

Description

Electrical signal detection system

technical field

The invention relates to an electrical signal detection system, in particular to an electrical signal detection system capable of fast power-on.

Background technique

At present, the demand for test equipment in the world is very extensive, and the signal processing of various test equipment on the shielding layer can involve this technology.

High-speed electrical signal detection equipment has high requirements for the signal shielding layer. A good shielding layer greatly reduces the electromagnetic interference of other external signals on the signal line, and also reduces the electromagnetic signal emission of its own circuit so that it will not affect other circuits. The traditional treatment method of the shielding layer is proper grounding. But for high-speed test equipment, the use of a large number of shielding layers makes the distributed capacitance larger, which makes the power-on time of the test signal longer, otherwise the signal cannot be established stably.

Figure 1 is a schematic structural diagram of a high-speed electrical signal detection system in the prior art, including a power-on test signal line 11 and a shielding layer 12, wherein the power-on test signal line is externally connected to a test signal source (not shown), And the shielding layer 12 is grounded. Obviously, when a high-speed test signal is applied, an obvious parasitic capacitance C will be generated between the power-on test signal line 11 and the shielding layer 12 , and this capacitance will prolong the power-on time of the power-on test signal line 11 .

A disadvantage of the prior art is that, for high-speed test equipment, the presence of parasitic capacitance slows down the test speed.

Contents of the invention

The technical problem to be solved by the present invention is to provide an electrical signal detection system, which can reduce the parasitic capacitance between the signal line and the shielding layer under high-speed test conditions, thereby improving test efficiency.

In order to solve the above problems, the present invention provides an electrical signal detection system, which includes a power-on test signal line and a shielding layer wrapped outside the power-on test signal line, and further includes a charging module and a discharge module, the power-on test The signal line is connected to the shielding layer through the charging module, and both the power-on test signal line and the shielding layer are electrically connected to the discharging module and grounded through the discharging module.

As an optional technical solution, the charging module includes an amplifying circuit, an input end of the amplifying circuit is electrically connected to the power-on test signal line through a first switch, and an output end is electrically connected to the shielding layer.

As an optional technical solution, the amplifying circuit includes multi-stage operational amplifiers arranged in series.

As an optional technical solution, the discharge module includes a second switch, a first resistor, a second resistor and a ground electrode, and the power-on test signal line is electrically connected to the ground through the second switch and the first resistor The electrode is further grounded, and the shielding layer is electrically connected to the ground electrode through the second resistor and thus grounded.

The advantage of the present invention is that by setting the charging module to charge the shielding layer to eliminate parasitic capacitance, and after the test is completed, the charge in the shielding layer is exported through the discharge module to prepare for the next test, thereby improving the power-on detection speed .

Description of drawings

Figure 1 is a schematic structural diagram of an electrical signal detection system in the prior art.

Figure 2 is a schematic structural diagram of the high-speed electrical signal detection system described in the specific embodiment of the present invention.

Detailed ways

Next, a specific implementation manner of the electrical signal detection system of the present invention will be described in detail with reference to the accompanying drawings.

Accompanying drawing 2 is a schematic structural diagram of the high-speed electrical signal detection system according to the specific embodiment of the present invention, including a power-on test signal line 11 and a shielding layer 12, wherein the power-on test signal line is externally connected to a power-on test signal source (not shown) , also includes a charging module 21 and a discharging module 23. The power-on test signal line 11 is connected to the shielding layer 12 through the charging module 21 , and both the power-on test signal line 11 and the shielding layer 12 are electrically connected to the discharge module 23 and grounded through the discharge module 23 .

When the power-on test signal line 11 carries out the power-on test, the discharge module 23 is cut off and the charging module 21 works, and the electric signal on the power-on test signal line 11 acts on the shielding layer 12 through the charging module 21, so that the shielding layer 12 and the power-on The equipotential of the test signal line 11 avoids the parasitic capacitance effect, and the signal on the power-on test signal line 11 can be quickly stabilized, which improves the power-on test speed.

At the end of the power-on test, the discharge module 23 works and the charging module 21 stops, so as to quickly release the charge in the shielding layer 12 and prepare for the next test.

Continuing to refer to accompanying drawing 2, in this specific embodiment, described charging module 21 comprises the amplifying circuit that is made up of the first operational amplifier 211 and the second operational amplifier 212 that are arranged in series, the input end of described amplifying circuit passes through a first The switch 213 is electrically connected to the power-on test signal line 11 , and the output end is electrically connected to the shielding layer 12 . The amplifying circuit can increase the voltage applied to the shielding layer 12 and improve the charging efficiency, so it is a preferred solution. When the first switch 213 is closed, the charging module 21 is in the working state; when the first switch 213 is turned off, the charging module 21 is in the off state. The first switch 213 adopts a high-speed switch, which can further improve the working efficiency of the system. In other implementation manners, other similar structures such as a transistor amplifier circuit may also be used instead of the amplifier circuit composed of multi-stage amplifiers.

Continuing to refer to accompanying drawing 2, in this embodiment, described discharge module 23 comprises a second switch 233, a first resistance 231, a second resistance 232 and a grounding electrode 234, power-on test signal line 11 passes through the The second switch 233 and the second resistor 232 are electrically connected to the ground electrode 234 and then grounded, and the shielding layer 12 is electrically connected to the ground electrode through the first resistor 231 and then grounded. The first resistor 231 and the second resistor 232 mainly play a protective role when discharging. When the second switch 233 is closed, the discharge module 21 is in the working state, and the power-on test signal line 11 is electrically connected to the ground electrode; Insulate from the ground electrode. The second switch 233 adopts a high-speed switch, which can further improve the working efficiency of the system. In other embodiments, switching elements such as transistors may be used instead of the second switch 233 to realize the switching function, and elements such as inductors may be used instead of resistors to realize the protection function and reduce parasitic effects at low or high frequencies.

In summary, although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can, without departing from the spirit and scope of the present invention, Various changes and modifications are made, so the scope of protection of the present invention should be defined by the patent scope applied for in the claims.

Claims (2)

1. electrical signal detection system, comprise adding the electric test signal line and being wrapped in and add the outer screen layer of electric test signal line, it is characterized in that, further comprise a charging module and a discharge module, the described electric test signal line that adds is connected to screen layer by charging module, add the equal electricity of electric test signal line and screen layer and be connected to discharge module, and by discharge module ground connection; Described charging module comprises an amplifying circuit, and the input end of described amplifying circuit is connected to by one first switch electricity and adds the electric test signal line, and output terminal electricity is connected to screen layer, and wherein first switch is speed-sensitive switch; Described discharge module comprises a second switch, one first resistance, one second resistance and a ground-electrode, add the electric test signal line and be connected to ground-electrode and then ground connection by described second switch and the first resistance electricity, screen layer is connected to ground-electrode and then ground connection by the second resistance electricity, and wherein second switch is speed-sensitive switch.

2. electrical signal detection according to claim 1 system is characterized in that, described amplifying circuit comprises the multi-stage operational amplifier that series connection arranges.

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