CN2682735Y

CN2682735Y - Apparatus for preventing noise signal generation as a result of nonuniform power distribution

Info

Publication number: CN2682735Y
Application number: CN 200320123733
Authority: CN
Inventors: 王胜弘
Original assignee: Getac Technology Corp
Current assignee: Getac Technology Corp
Priority date: 2003-11-26
Filing date: 2003-11-26
Publication date: 2005-03-02
Anticipated expiration: 2013-11-26

Abstract

The utility model relates to the apparatus for preventing the noise signal generation as a result of the nonuniform power distribution. One or more bridging and penetrating capacitors are provided between the independent powers of contiguous electronic circuit boards. The purpose of preventing the generation of the noise signal caused by the nonuniform distribution of the power is obtained by making use of the characteristics of the penetrating capacitors of that: the penetrating capacitors are in the short circuit when the direct current is passed, and the penetrating capacitors can filter out the noise signal when the alternating current is passed. Additionally, the both ends of the bridging and penetrating capacitors are connected with an earth-contact penetrating capacitor, and the generation of the noise signal can be effectively prevented under the low cost without increasing the layers of the circuit boards.

Description

Prevent to produce the device of noise signal owing to power distribution is inhomogeneous

Technical field

The utility model is that a kind of circuit board that can prevent produces the device that the electromagnetic noise signal disturbs, and You Zhineng prevents to produce owing to power distribution is inhomogeneous the device of noise signal.

Prior art

On each electronic circuit board (this electronic circuit board comprises power supply circuit board and integrated circuit circuit board) of printed circuit board (PCB), a power zone block is arranged all, all be connected to an independent current source on each power zone block, along with the formation of high speed circuit with to the raising of the requirement of parts density and function, cause the independent current source on each electronic circuit board to cut apart messy, the voltage distribution of each electronic circuit board is inhomogeneous, cause electric power loop to have some setbacks, on power zone block, just have the noise signal generation, thereby interfere with the function of other electronic circuit board.Solution in the past is the number of plies or the area that increases printed circuit board (PCB), cause the voltage distribution equalization between each electronic circuit board, do not have too big potential difference, effectively prevent the generation of noise signal, but increase the number of plies of printed circuit board (PCB) or the cost that area has also just increased printed circuit board (PCB) accordingly.

Summary of the invention

Main purpose of the present utility model, provide a device that prevents to produce noise signal owing to power distribution is inhomogeneous, between the independent current source of adjacent each electronic circuit board, be connected to one or more cross-over connections and run through electric capacity, utilization runs through electric capacity short circuit when direct current passes through, alternating current by the time can filter out the characteristic of noise signal, reach the purpose that prevents to produce noise signal owing to power distribution is inhomogeneous; In addition, can run through electric capacity two ends and ground connection that this cross-over connection runs through electric capacity, so that the more effective noise signal that filters out; Owing to do not need to eliminate noise signal, therefore the expense that yet can save printed circuit board (PCB) by the area or the level that increase printed circuit board (PCB).

Description of drawings

Below, with reference to accompanying drawing, for those skilled in the art that, to the detailed description of the present utility model, above-mentioned and other purposes of the present utility model, feature and advantage will be apparent.

Fig. 1 Fig. 1 is a circuit box schematic diagram of the present utility model.

Embodiment

See also shown in Figure 1, square frame is represented first independent current source 1 respectively among the figure, second independent current source 2, (the 3rd independent current source 3 or the like only draws among the figure three independent current sources, all the other do not draw), between first independent current source 1 and second independent current source 2, be connected to a cross-over connection and run through electric capacity 4, between second independent current source 2 and the 3rd independent current source 3, be connected to a cross-over connection and run through electric capacity 5, by that analogy, between all adjacent two independent current sources, all connect cross-over connection run through electric capacity till (not drawing fully among the figure), also can connect a plurality of cross-over connections between wherein adjacent two independent current sources and run through electric capacity, the effect of its filtered noise signal is more obvious.In addition, for ground noise signal (ground bounce) effect of control that makes each independent current source block better, can be again at the two ends of cross-over connection electric capacity 4 each and be connected to that ground connection is run through electric capacity 101 and ground connection is run through electric capacity 201, cross-over connection run through electric capacity 5 two ends can each and be connected to that ground connection is run through electric capacity 202 and ground connection is run through electric capacity 301, by that analogy, all and be connected to ground connection and run through electric capacity (not drawing fully among the figure) at two ends that each cross-over connection runs through electric capacity.

When each independent current source is switched on power supply, owing to run through electric capacity short circuit when direct current passes through, alternating current by the time can filter out the characteristic of noise signal, noise signal on first independent current source 1 runs through electric capacity 4 by cross-over connection and is filtered, prevent that noise signal is sent on second independent current source 2, noise signal on second independent current source 2 runs through electric capacity 5 by cross-over connection and is filtered, prevent that noise signal is sent on the 3rd independent current source 3, independent current source thereafter (does not draw among the figure) by that analogy.In addition, also can run through noise signal on electric capacity 101 more effective elimination first independent current sources 1 by ground connection, run through electric capacity 201 and ground connection by ground connection and run through noise signal on electric capacity 202 more effective elimination second independent current sources 1, followingly (do not draw among the figure) by that analogy.

Certainly, difference according to the anti-noise signal ability of each electronic circuit board, can run through on the termination of the more effective elimination noise signal of requirement at electric capacity two ends a ground connection in cross-over connection and run through electric capacity, if the anti-noise signal ability of the electronic circuit board at two ends is all very strong, then cross-over connection runs through the electric capacity two ends and all can not add ground connection and run through electric capacity; Also can be connected in series a plurality of cross-over connections between each independent current source and run through electric capacity.

In sum, the utility model runs through electric capacity by be connected to one or more cross-over connections between adjacent each electronic circuit board independent current source, reach the purpose that prevents to produce noise signal owing to power distribution is inhomogeneous, can be connected to ground connection at the two ends of this cross-over connection electric capacity in addition and run through electric capacity, so that the more effective generation that prevents noise signal.

Above-mentioned the utility model only illustrates with most preferred embodiment, and this technical field is had the people of general knowledge, and when carrying out various variations, the variation of these types all should be included in spirit of the present utility model and claims scope.

Claims

1, a kind of device that prevents to produce noise signal owing to power distribution is inhomogeneous, comprise at least two electronic circuit boards, one independent current source is all arranged on each electronic circuit board, it is characterized in that, be connected with a cross-over connection at least therein between the independent current source of two adjacent electronic circuit boards and run through electric capacity.

2, the device that prevents to produce noise signal according to claim 1 owing to power distribution is inhomogeneous, it is characterized in that the end of one at least that the described cross-over connection that is connected between adjacent electronic circuit board independent current source runs through electric capacity can in addition and connect a ground connection and run through electric capacity.